Re: [PATCH v3 1/1] runchecks: Generalize make C={1,2} to support multiple checkers

[Jani Nikula]

On Thu, 04 Jan 2018, Knut Omang <knut.omang@xxxxxxxxxx> wrote:
> Add scripts/runchecks which has generic support for running
> checker tools in a convenient and user friendly way that
> the author hopes can contribute to rein in issues detected
> by these tools in a manageable and convenient way.
>
> scripts/runchecks provides the following basic functionality:
>
> * Makes it possible to selectively suppress output from individual
>   checks on a per file or per subsystem basis.
> * Unifies output and suppression input from different tools
>   by providing a single unified syntax and presentation for the
>   underlying tools in the style of "scripts/checkpatch.pl --show-types".
> * Allows selective run of one, or more (or all) configured tools
>   for each file.
>
> In the Makefile system, the sparse specific setup has been replaced
> by setup for runchecks.
>
> This version of runchecks together with a "global" configuration
> file in "scripts/runchecks.cfg" supports sparse, checkpatch, and checkdoc,
> a trivial abstraction above a call to 'kernel-doc -none'.
> It also supports forwarding calls to coccicheck for coccinelle support
> but this is not quite as worked through as the three other checkers,
> mainly because of lack of error data as all checks pass by default
> right now.
>
> The code is designed to be easily extensible to support more checkers
> as they emerge, and some generic checker support is even available
> just via simple additions to "scripts/runchecks.cfg".
>
> The runchecks program unifies configuration, processing
> and output for multiple checker tools to make them
> all run as part of the C=1 or C=2 option to make.
>
> Currently with full support and unified behaviour for
> sparse:     sparse
> checkpatch: scripts/checkpatch.pl
> checkdoc:   kernel-doc -none
>
> In principle supported but not unified in output(yet):
> coccinelle: scripts/coccicheck
>
> Introduces a new documentation section titled
> "Makefile support for running checkers"
>
> Also updates documentation for the make C= option
> in some other doc files, as the behaviour has
> been changed to be less sparse specific and more
> generic. The coccinelle documentation also had the
> behaviour of C=1 and C=2 swapped.

I'm surprised the commit message and the provided documentation say
nothing about using CHECK=foo on the command line. That already supports
arbitrary checkers. How does this relate to that? Is this supposed to be
a complete replacement? Or what?

'make help' also references $CHECK, and this patch doesn't update the
help text.

> Signed-off-by: Knut Omang <knut.omang@xxxxxxxxxx>
> Reviewed-by: HÃkon Bugge <haakon.bugge@xxxxxxxxxx>
> Reviewed-by: Ãsmund Ãstvold <asmund.ostvold@xxxxxxxxxx>
> Reviewed-by: John Haxby <john.haxby@xxxxxxxxxx>
> ---
>  Documentation/dev-tools/coccinelle.rst |  12 +-
>  Documentation/dev-tools/index.rst      |   1 +-
>  Documentation/dev-tools/runchecks.rst  | 215 ++++++++-
>  Documentation/dev-tools/sparse.rst     |  30 +-
>  Documentation/kbuild/kbuild.txt        |   9 +-
>  Makefile                               |  23 +-
>  scripts/Makefile.build                 |   4 +-
>  scripts/runchecks                      | 734 ++++++++++++++++++++++++++-
>  scripts/runchecks.cfg                  |  63 ++-
>  scripts/runchecks_help.txt             |  43 ++-

Please get rid of runchecks_help.txt and use the usual python mechanisms
to specify and parse command line options, with their help texts,
including automated --help output. This keeps the implementation and the
help together, with hopes they'll actually stay in sync. Please don't
hand roll argument parsers in python.

BR,
Jani.

>  10 files changed, 1114 insertions(+), 20 deletions(-)
>  create mode 100644 Documentation/dev-tools/runchecks.rst
>  create mode 100755 scripts/runchecks
>  create mode 100644 scripts/runchecks.cfg
>  create mode 100644 scripts/runchecks_help.txt
>
> diff --git a/Documentation/dev-tools/coccinelle.rst b/Documentation/dev-tools/coccinelle.rst
> index 94f41c2..c98cc44 100644
> --- a/Documentation/dev-tools/coccinelle.rst
> +++ b/Documentation/dev-tools/coccinelle.rst
> @@ -157,17 +157,19 @@ For example, to check drivers/net/wireless/ one may write::
>  
>      make coccicheck M=drivers/net/wireless/
>  
> -To apply Coccinelle on a file basis, instead of a directory basis, the
> -following command may be used::
> +To apply Coccinelle as the only checker on a file basis,
> +instead of a directory basis, the following command may be used::
>  
> -    make C=1 CHECK="scripts/coccicheck"
> +    make C=2 CF="--run:coccicheck"
>  
> -To check only newly edited code, use the value 2 for the C flag, i.e.::
> +To check only newly edited code, use the value 1 for the C flag, i.e.::
>  
> -    make C=2 CHECK="scripts/coccicheck"
> +    make C=1 CF="--run:coccicheck"
>  
>  In these modes, which works on a file basis, there is no information
>  about semantic patches displayed, and no commit message proposed.
> +For more information about options in this calling mode, see
> +Documentation/dev-tools/runchecks.rst .
>  
>  This runs every semantic patch in scripts/coccinelle by default. The
>  COCCI variable may additionally be used to only apply a single
> diff --git a/Documentation/dev-tools/index.rst b/Documentation/dev-tools/index.rst
> index e313925..cb4506d 100644
> --- a/Documentation/dev-tools/index.rst
> +++ b/Documentation/dev-tools/index.rst
> @@ -16,6 +16,7 @@ whole; patches welcome!
>  
>     coccinelle
>     sparse
> +   runchecks
>     kcov
>     gcov
>     kasan
> diff --git a/Documentation/dev-tools/runchecks.rst b/Documentation/dev-tools/runchecks.rst
> new file mode 100644
> index 0000000..1a43c05
> --- /dev/null
> +++ b/Documentation/dev-tools/runchecks.rst
> @@ -0,0 +1,215 @@
> +.. Copyright 2017 Knut Omang <knut.omang@xxxxxxxxxx>
> +
> +Makefile support for running checkers
> +=====================================
> +
> +Tools like sparse, coccinelle, and scripts/checkpatch.pl are able to detect a
> +lot of syntactic and semantic issues with the code, and are also constantly
> +evolving and detecting more. In an ideal world, all source files should
> +adhere to whatever rules imposed by checkpatch.pl and sparse etc. with all
> +bells and whistles enabled, in a way that these checkers can be run as a reflex
> +by developers (and by bots) from the top level Makefile for every changing
> +source file. In the real world however there's a number of challenges:
> +
> +* Sometimes there are valid reasons for accepting violations of a checker
> +  rule, even if that rule is a sensible one in the general case.
> +* Some subsystems have different restrictions and requirements.
> +  (Ideally, the number of subsystems with differing restrictions and
> +  requirements will diminish over time.)
> +* Similarly, the kernel contains a lot of code that predates the tools, or at
> +  least some of the newer rules, and we would like these tools to evolve without
> +  requiring the need to fix all issues detected with it in the same commit.
> +  We also want to accommodate new tools, so that each new tool does not
> +  have to reinvent its own mechanism for running checks.
> +* On the other hand, we want to make sure that files that are clean
> +  (to some well defined extent, such as passing checkpatch or sparse
> +  with checks only for certain important types of issues) keep being so.
> +
> +This is the purpose of ``scripts/runchecks``.
> +
> +The ``runchecks`` program looks for files named ``runchecks.cfg`` in the
> +``scripts`` directory, then in the directory hierarchy of the source file,
> +starting from where the source file is located, searching upwards. If at least
> +one such file exists in the source tree, ``runchecks`` parses a set of
> +rules from it, and uses them to determine how to invoke a set of individual
> +checker tools for a particular file. The kernel Makefile system supports
> +this feature as an integrated part of compiling the code, using the
> +``C={1,2}`` option. With::
> +
> +	make C=1
> +
> +runchecks will be invoked if the file needs to be recompiled. With ::
> +
> +	make C=2
> +
> +runchecks will be invoked for all source files, even if they do not need
> +recompiling. Based on the configuration, ``runchecks`` will invoke one or
> +more checkers. The number and types of checkers to run are configurable and
> +can also be selected on the command line::
> +
> +	make C=2 CF="--run:sparse,checkpatch"
> +
> +If only one checker is run, any parameter that is not recognized by
> +``runchecks`` itself will be forwarded to the checker. If more than one checker
> +is enabled, parameters can be forwarded to a specific checker by means of
> +this syntax::
> +
> +	make C=2 CF="--to-checkpatch:--terse"
> +
> +A comma separated list of parameters can be supplied if necessary.
> +
> +Supported syntax of the runchecks.cfg configuration file
> +--------------------------------------------------------
> +
> +The ``runchecks`` configuration file chain can be used to set policies and "rein in"
> +checker errors piece by piece for a particular subsystem or driver. It can
> +also be used to mitigate and extend checkers that do not support
> +selective suppression of all it's checks.
> +
> +Two classes of configuration are available. The first class is configuration
> +that defines what checkers are enabled, and some logic to allow better
> +suppression or a more unified output of warning messages.
> +This type of configuration should go into the first accessed
> +configuration file, and has been preconfigured for the currently supported
> +checkers in ``scripts/runchecks.cfg``. The second class is the features for
> +configuring the output of the checkers by selectively suppressing checks on
> +a per file or per check basis. These typically go in the source tree in
> +the directory of the source file or above. Some of the syntax is generic
> +and some is only supported by some checkers.
> +
> +For the first class of configuration the following syntax is supported::
> +
> +	# comments
> +	checker checkpatch [command]
> +	addflags <list of extra flags and parameters>
> +	cflags
> +	typedef NAME <regular expression>
> +	run [checker list|all]
> +
> +The ``checker`` command switches ``runchecks``'s attention to a particular
> +checker. The following commands until the next ``checker`` statement
> +apply to that particular checker. The first occurrence of ``checker``
> +also serves as a potentially defining operation, if the checker name
> +has not been preconfigured. In that case, a second parameter can be used
> +to provide the name of the command used to run the checker.
> +A full checker integration into runchecks will typically require some
> +additions to runchecks, and will then have been preconfigured,
> +but simple checkers might just be configured on the fly.
> +
> +The ``addflags`` command incrementally adds more flags and parameters to
> +the command line used to invoke the checker. This applies to all
> +invocations of the checker from runchecks.
> +
> +The ``cflags`` command forwards all the flags and options passed to
> +the compiler invocation to the checker. The default is to suppress these
> +parameters when invoking the checker.
> +
> +The ``typedef`` command adds ``NAME`` and associates it with the given regular
> +expression. This expression is used to match against standard error output from
> +the checker. In the kernel tree, ``NAME`` can then be used in local
> +``runcheck.cfg`` files as a new named check that runchecks understands and that
> +can be used with checker supported names below to selectively suppress that
> +particular set of warning or error messages. This is useful to handle output
> +checks for which the underlying checker does not provide any suppression.  Check
> +type namespaces are separate for the individual checkers. You can list the state
> +of the built in and configured checker and check types with::
> +
> +	scripts/runchecks --list
> +
> +The checker implementations of the ``typedef`` command also allow runchecks to
> +perform some unification of output by rewriting the output lines, and use of the
> +new type names in the error output, to ease the process of updating the
> +runchecks.cfg files.  It also adds some limited optional color support.  Having
> +a unified representation of the error output also makes it much easier to do
> +statistics or other operations on top of an aggregated output from several
> +checkers.
> +
> +For the second class of configuration the following syntax is supported::
> +
> +	# comments
> +	checker checker_name
> +	except check_type [files ...]
> +	pervasive check_type1 [check_type2 ...]
> +	line_len <n>
> +
> +The ``except`` directive takes a check type such as for example
> +``MACRO_ARG_REUSE``, and a set of files that should not be subject to this
> +particular check type. The ``pervasive`` command disables the listed types
> +of checks for all the files in the subtree.  The ``except`` and
> +``pervasive`` directives can be used cumulatively to add more exceptions.
> +The ``line_len`` directive defines the upper bound of characters per line
> +tolerated in this directory. Currently only ``checkpatch`` supports this
> +command.
> +
> +Options when running checker programs from make
> +-----------------------------------------------
> +
> +A make variable ``CF`` allows passing additional parameters to
> +``runchecks``. You can for instance use::
> +
> +	make C=2 CF="--run:checkpatch --fix-inplace"
> +
> +to run only the ``checkpatch`` checker, and to have checkpatch try to fix
> +issues it finds - *make sure you have a clean git tree and carefully review
> +the output afterwards!* Combine this with selectively enabling of types of
> +errors via changes under ``checker checkpatch`` to the local
> +``runchecks.cfg``, and you can focus on fixing up errors subsystem or
> +driver by driver on a type by type basis.
> +
> +By default runchecks will skip all files if a ``runchecks.cfg`` file cannot
> +be found in the directory of the file or in the tree above.  This is to
> +allow builds with ``C=2`` to pass even for subsystems that have not yet done
> +anything to rein in checker errors. At some point when all subsystems and
> +drivers either have fixed all checker errors or added proper
> +``runchecks.cfg`` files, this can be changed.
> +Note that the runchecks.cfg file in the scripts/ directory is special, in that
> +it can be present without triggering checker runs in the main kernel tree.
> +
> +To force runchecks to run a full run in directories/trees where runchecks
> +does not find  a ``runchecks.cfg`` file as well, use::
> +
> +	make C=2 CF="-f"
> +
> +If you like to see all the warnings and errors produced by the checkers, ignoring
> +any runchecks.cfg files except the one under ``scripts``, you can use::
> +
> +	make C=2 CF="-n"
> +
> +or for a specific module directory::
> +
> +	make C=2 M=drivers/infiniband/core CF="--color -n -w"
> +
> +with the -w option to ``runchecks`` to suppress errors from any of the
> +checkers and just continue on, and the ``--color`` option to present errors
> +with colors where supported.
> +
> +Ever tightening checker rules
> +-----------------------------
> +
> +Commit the changes to the relevant ``runchecks.cfg`` together with the code
> +changes that fixes a particular type of issue, this will allow automatic
> +checker running by default. This way we can ensure that new errors of that
> +particular type do not inadvertently sneak in again! This can be done at
> +any subsystem or module maintainer's discretion and at the right time
> +without having to do it all at the same time.
> +
> +Before submitting your changes, verify that a full "make C=2" passes
> +with no errors.
> +
> +Extending and improving checker support in ``runchecks``
> +--------------------------------------------------------
> +
> +The runchecks program has been written with extensibility in mind.
> +If the checker starts its reporting lines with filename:lineno, there's a
> +good chance that a new checker can simply be added by adding::
> +
> +	checker mychecker path_to_mychecker
> +
> +to ``scripts/runchecks.cfg`` and suitable ``typedef`` expressions to provide
> +selective suppressions of output, however it is likely that some quirks are
> +needed to make the new checker behave similarly to the others, and to support
> +the full set of features, such as the ``--list`` option. This is done by
> +implementing a new subclass of the Checker class in ``runchecks``. This is the
> +way all the available default supported checkers are implemented, and those
> +relatively lean implementations could serve as examples for support for future
> +checkers.
> diff --git a/Documentation/dev-tools/sparse.rst b/Documentation/dev-tools/sparse.rst
> index 78aa00a..e3e8b27 100644
> --- a/Documentation/dev-tools/sparse.rst
> +++ b/Documentation/dev-tools/sparse.rst
> @@ -101,5 +101,31 @@ recompiled, or use "make C=2" to run sparse on the files whether they need to
>  be recompiled or not.  The latter is a fast way to check the whole tree if you
>  have already built it.
>  
> -The optional make variable CF can be used to pass arguments to sparse.  The
> -build system passes -Wbitwise to sparse automatically.
> +The "make C={1,2}" form of kernel make indirectly calls sparse via "runchecks",
> +which dependent on configuration and command line options may dispatch calls to
> +other checkers in addition to sparse. Details on how this works is covered
> +in Documentation/dev-tools/runchecks.rst .
> +
> +The optional make variable CF can be used to pass arguments to runchecks for dispatch
> +to sparse. If sparse is the only tool enabled, any option not recognized by
> +runchecks will be forwarded to sparse. If more than one tool is active, you must
> +add the parameters you want sparse to get as a comma separated list prefixed by
> +``--to-sparse:``. If you want sparse to be the only checker run, and you want
> +some nice colored output, you can specify this as::
> +
> +	make C=2 CF="--run:sparse --color"
> +
> +This will cause sparse to be called for all files which are supported by a valid
> +runchecks configuration (again see Documentation/dev-tools/runchecks.rst for
> +details). If you want to run sparse on all files and ignore any missing
> +configuration files(s), just add ``-n`` to the list of options passed to
> +runchecks. This will cause runchecks to call sparse with all errors enabled for
> +all files even if no valid configuration is found in the tree for the source files.
> +
> +By default "runchecks" is set to enable all sparse errors, but you can
> +configure what checks to be applied by sparse on a per file or per subsystem
> +basis. With the above invocation, make will fail and stop on the first file
> +encountered with sparse errors or warnings in it. If you want to continue
> +anyway, you can use::
> +
> +	make C=2 CF="--run:sparse --color -w"
> diff --git a/Documentation/kbuild/kbuild.txt b/Documentation/kbuild/kbuild.txt
> index ac2363e..260e688 100644
> --- a/Documentation/kbuild/kbuild.txt
> +++ b/Documentation/kbuild/kbuild.txt
> @@ -103,10 +103,13 @@ CROSS_COMPILE is also used for ccache in some setups.
>  
>  CF
>  --------------------------------------------------
> -Additional options for sparse.
> -CF is often used on the command-line like this:
> +Additional options for runchecks, the generic checker runner.
> +CF is often used on the command-line for instance like this:
>  
> -    make CF=-Wbitwise C=2
> +    make C=2 CF="--run:sparse --color -w"
> +
> +to run the sparse tool only, and to use colored output and continue on warnings
> +or errors.
>  
>  INSTALL_PATH
>  --------------------------------------------------
> diff --git a/Makefile b/Makefile
> index eb1f597..bba07b9 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -159,14 +159,22 @@ ifeq ($(skip-makefile),)
>  # so that IDEs/editors are able to understand relative filenames.
>  MAKEFLAGS += --no-print-directory
>  
> -# Call a source code checker (by default, "sparse") as part of the
> -# C compilation.
> +# Do source code checking as part of the C compilation.
> +#
>  #
>  # Use 'make C=1' to enable checking of only re-compiled files.
>  # Use 'make C=2' to enable checking of *all* source files, regardless
>  # of whether they are re-compiled or not.
>  #
> -# See the file "Documentation/dev-tools/sparse.rst" for more details,
> +# Source code checking is done via the runchecks script, which
> +# has knowledge of each individual cheker and how it wants to be called,
> +# as well as options for rules as to which checks that are applicable
> +# to different parts of the kernel, at source file granularity.
> +#
> +# Several types of checking is available, and custom checkers can also
> +# be added.
> +#
> +# See the file "Documentation/dev-tools/runchecks.rst" for more details,
>  # including where to get the "sparse" utility.
>  
>  ifeq ("$(origin C)", "command line")
> @@ -383,10 +391,9 @@ INSTALLKERNEL  := installkernel
>  DEPMOD		= /sbin/depmod
>  PERL		= perl
>  PYTHON		= python
> -CHECK		= sparse
>  
> -CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
> -		  -Wbitwise -Wno-return-void $(CF)
> +CHECK		= $(srctree)/scripts/runchecks
> +CHECKFLAGS      =
>  NOSTDINC_FLAGS  =
>  CFLAGS_MODULE   =
>  AFLAGS_MODULE   =
> @@ -429,7 +436,7 @@ GCC_PLUGINS_CFLAGS :=
>  export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
>  export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
>  export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
> -export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
> +export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECK_CFLAGS CHECKFLAGS
>  
>  export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
>  export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_KASAN CFLAGS_UBSAN
> @@ -778,7 +785,7 @@ endif
>  
>  # arch Makefile may override CC so keep this after arch Makefile is included
>  NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
> -CHECKFLAGS     += $(NOSTDINC_FLAGS)
> +CHECK_CFLAGS     += $(NOSTDINC_FLAGS)
>  
>  # warn about C99 declaration after statement
>  KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index cb8997e..13325b3 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -93,10 +93,10 @@ __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
>  ifneq ($(KBUILD_CHECKSRC),0)
>    ifeq ($(KBUILD_CHECKSRC),2)
>      quiet_cmd_force_checksrc = CHECK   $<
> -          cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
> +          cmd_force_checksrc = $(CHECK) $(CF) $< -- $(CHECKFLAGS) $(c_flags);
>    else
>        quiet_cmd_checksrc     = CHECK   $<
> -            cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
> +            cmd_checksrc     = $(CHECK) $(CF) $< -- $(CHECKFLAGS) $(c_flags);
>    endif
>  endif
>  
> diff --git a/scripts/runchecks b/scripts/runchecks
> new file mode 100755
> index 0000000..4dd2969
> --- /dev/null
> +++ b/scripts/runchecks
> @@ -0,0 +1,734 @@
> +#!/usr/bin/python
> +
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
> +#    Author: Knut Omang <knut.omang@xxxxxxxxxx>
> +#
> +# This program is free software; you can redistribute it and/or modify
> +# it under the terms of the GNU General Public License version 2
> +# as published by the Free Software Foundation.
> +
> +# The program implements a generic and extensible code checker runner
> +# that supports running various checker tools from the kernel Makefile
> +# or standalone, with options for selectively suppressing individual
> +# checks on a per file or per check basis.
> +#
> +# The program has some generic support for checkers, but to implement
> +# support for a new checker to the full extent, it might be necessary to
> +#   1) subclass the Checker class in this file with checker specific processing.
> +#   2) add typedef definitions in runchecks.cfg in this directory
> +#
> +# This version of runchecks has full support for the following tools:
> +#   sparse:      installed separately
> +#   checkpatch:  checkpatch.pl
> +#   checkdoc:    kernel-doc -none
> +#
> +# See file "Documentation/dev-tools/runchecks.rst" for more details
> +#
> +
> +import sys, os, subprocess, fcntl, select, re
> +from os.path import dirname, basename
> +
> +class CheckError(Exception):
> +    def __init__(self, value):
> +        self.value = value
> +    def __str__(self):
> +        return self.value
> +
> +def usage():
> +    manual = os.path.join(srctree, "scripts/runchecks_help.txt")
> +    f = open(manual, "r")
> +    for line in f:
> +        sys.stdout.write(line)
> +    f.close()
> +    print ""
> +    print "Configured checkers:"
> +    for (c, v) in checker_types.iteritems():
> +        enabled = "[default disabled]"
> +        for c_en in config.checkers:
> +            if c_en.name == c:
> +                enabled = ""
> +                break
> +        print "  %-20s %s" % (c, enabled)
> +    exit(1)
> +
> +
> +# A small configuration file parser:
> +#
> +class Config:
> +    def __init__(self, srctree, workdir, filename):
> +        self.path = []
> +        self.relpath = {}
> +        relpath = ""
> +
> +        # Look for a global config file in the scripts directory:
> +        file = os.path.join(srctree, "scripts/%s" % filename)
> +        if os.path.exists(file):
> +            self.path.append(file)
> +            self.relpath[file] = relpath
> +
> +        while not ignore_config:
> +            self.file = os.path.join(workdir,filename)
> +            if os.path.exists(self.file):
> +                self.path.append(self.file)
> +                self.relpath[self.file] = relpath
> +            if len(workdir) <= len(srctree):
> +                break
> +            relpath = "%s/%s" % (basename(workdir), relpath)
> +            workdir = dirname(workdir)
> +
> +        self.checkers = []
> +        self.cur_chk = None
> +        self.color = False
> +        self.list_only = False
> +
> +        self.command = {
> +            "checker"	: self.checker,
> +            "addflags"	: self.addflags,
> +            "run"	: self.runlist,
> +            "except"	: self.exception,
> +            "pervasive" : self.pervasive,
> +            "cflags"	: self.cflags,
> +            "typedef"	: self.typedef
> +        }
> +
> +        if verbose:
> +            print "  ** runchecks: config path: %s" % self.path
> +        for f in self.path:
> +            self.ParseConfig(f)
> +
> +    def checker(self, argv):
> +        try:
> +            self.cur_chk = checker_types[argv[0]]
> +        except KeyError:
> +            if len(argv) < 2:
> +                d1 = "generic checker configurations!"
> +                raise CheckError("%s:%d: use 'checker %s command' for %s" % \
> +                                 (self.file, self.lineno, argv[0], d1))
> +
> +            AddChecker(Checker(argv[0], argv[1], srctree, workdir))
> +            self.cur_chk = checker_types[argv[0]]
> +
> +    def addflags(self, argv):
> +        self.cur_chk.addflags(argv)
> +
> +    def exception(self, argv):
> +        type = argv[0]
> +        if self.cur_chk:
> +            relpath = self.relpath[self.file]
> +            self.cur_chk.exception(type, relpath, argv[1:])
> +        else:
> +            raise CheckError("%s:%d: checker has not been set" % (self.file, self.lineno))
> +
> +    def pervasive(self, argv):
> +        self.cur_chk.pervasive(argv)
> +
> +    def runlist(self, argv):
> +        try:
> +            for c in argv:
> +                self.checkers.append(checker_types[c])
> +        except KeyError, k:
> +            if str(k) == "'all'":
> +                self.checkers = checker_types.values()
> +            else:
> +                available = "\n  -- avaliable checkers are: %s" % ",".join(checker_types.keys())
> +                raise CheckError("Checker %s not found - not configured?%s" % (str(k), available))
> +
> +    def cflags(self, argv):
> +        self.cur_chk.cflags = True
> +
> +    def typedef(self, argv):
> +        self.cur_chk.typedef(argv)
> +
> +    # Parse one configuration file in the configuration file list:
> +    #
> +    def ParseConfig(self, file):
> +        f = open(file, 'r')
> +        self.file = file
> +        self.lineno = 0
> +        for line in f:
> +            self.lineno = self.lineno + 1
> +            token = line.split()
> +            if len(token) < 1:
> +                continue
> +            if token[0][0] == '#':
> +                continue
> +            try:
> +                self.command[token[0]](token[1:])
> +            except KeyError:
> +                if not self.cur_chk:
> +                    raise CheckError("%s:%s: checker has not been set" % (self.file, self.lineno))
> +                self.cur_chk.ParseOptional(token[0], token[1:])
> +            except AttributeError:
> +                if not self.cur_chk:
> +                    raise CheckError("%s:%s: checker has not been set" % (self.file, self.lineno))
> +
> +        f.close()
> +        self.cur_chk = None
> +
> +    # Option forwarding to checkers
> +    # and optional selection of which checkers to run:
> +    def ProcessOpts(self, opts):
> +        for opt in opts:
> +            if opt == "--color":
> +                self.color = True
> +                continue
> +            elif opt == "--list":
> +                self.list_only = True
> +                continue
> +            elif opt == "--help":
> +                usage_only = True
> +
> +            fw = re.match("^--to-(\w+):(.*)$", opt)
> +            if fw:
> +                try:
> +                    cname = fw.group(1)
> +                    checker = checker_types[cname]
> +                except:
> +                    raise CheckError("Unknown checker '%s' specified in option '%s'" % (cname, opt))
> +                newargs = fw.group(2).split(',')
> +                checker.cmdvec += newargs
> +                if verbose:
> +                    print "Added extra args for %s: %s" % (cname, newargs)
> +                continue
> +
> +            runopt = re.match("^--run:(.*)$", opt)
> +            if runopt:
> +                clist = runopt.group(1).split(",")
> +                # Command line override: reset list of checkers
> +                self.checkers = []
> +                self.runlist(clist)
> +                continue
> +
> +            if len(self.checkers) == 1:
> +                # If only one checker enabled, just pass everything we don't know about through:
> +                self.checkers[0].cmdvec.append(opt)
> +            else:
> +                raise CheckError("Unknown option '%s'" % opt)
> +
> +    # We always expect at least one config file that sets up the active checkers:
> +    #
> +    def HasPathConfig(self):
> +        return len(self.path) > 1
> +
> +
> +# The base class for checkers:
> +# For specific support a particular checker, implement a subclass of this:
> +#
> +class Checker:
> +    def __init__(self, name, cmd, srctree, workdir, ofilter = None, efilter = None):
> +        self.name = name
> +        self.srctree = srctree
> +	self.workdir = workdir
> +	self.efilter = efilter
> +        if ofilter:
> +            self.ofilter = ofilter
> +        else:
> +            self.ofilter = self.suppress
> +        self.strout = ""
> +        self.strerr = ""
> +        self.cflags = False
> +        if cmd[0:7] == "scripts":
> +            cmd = os.path.join(self.srctree, cmd)
> +        self.cmd = cmd
> +        self.cmdvec = cmd.split()
> +        self.pervasive_opts = [] # "global" ignore list
> +        self.exceptions = []     # exception list for this file
> +        self.file_except = []    # Aggregated list of check types to ignore for this file
> +        self.re_except_def = {}  # check_type -> <regex to match it in stderr>
> +        self.doc = {}		 # Used when parsing documentation: check type -> doc string
> +        self.cont = []
> +        self.last_ignore = False
> +        self.unclassified = 0	 # With RegexFilter: Number of "red" lines not classified
> +
> +    def filter_env(self, dict):
> +        return dict
> +
> +    def readline(self, is_stdout, fd):
> +        tmp_str = ""
> +        try:
> +            s = os.read(fd, 1000)
> +            while s != '':
> +                tmp_str += s
> +                s = os.read(fd, 1)
> +        except OSError:
> +            None
> +
> +        if is_stdout:
> +            self.strout += tmp_str
> +            tmp_str = self.strout
> +        else:
> +            self.strerr += tmp_str
> +            tmp_str = self.strerr
> +
> +        inx = tmp_str.find('\n') + 1
> +        if inx != 0:
> +            t = tmp_str[:inx]
> +            if is_stdout:
> +                self.strout = tmp_str[inx:]
> +            else:
> +                self.strerr = tmp_str[inx:]
> +        else:
> +            return ''
> +        return t
> +
> +    def SetNonblocking(self, fd):
> +        fl = fcntl.fcntl(fd, fcntl.F_GETFL)
> +        try:
> +            fcntl.fcntl(fd, fcntl.F_SETFL, fl | os.O_NDELAY)
> +        except AttributeError:
> +            fcntl.fcntl(fd, fcntl.F_SETFL, fl | fcntl.FNDELAY)
> +
> +    def Run(self, file, verbose):
> +        cmdvec = self.cmdvec
> +        if self.cflags:
> +            cmdvec += c_argv
> +        if not force:
> +            self.file_except = set(self.exceptions + self.pervasive_opts)
> +        self.Postprocess()
> +        if not file:
> +            raise CheckError("error: missing file parameter")
> +        cmdvec.append(file)
> +        if debug:
> +            print "  ** running %s: %s" % (self.name, " ".join(cmdvec))
> +        elif verbose:
> +            print "  -- checker %s --" % self.name
> +        try:
> +            ret = self.RunCommand(cmdvec, self.ofilter, self.efilter)
> +        except OSError, e:
> +            if re.match(".*No such file or directory", str(e)):
> +                if len(config.checkers) == 1:
> +                    raise CheckError("Failed to run checker %s: %s: %s" % (self.name, self.cmd, str(e)))
> +                if verbose:
> +                    print "  ** %s does not exist - ignoring %s **" % (self.name, self.cmd)
> +                return 0
> +        ret = self.PostRun(ret)
> +        return ret
> +
> +    def RunCommand(self, cmdvec, ofilter, efilter):
> +	my_env = self.filter_env(os.environ)
> +        child = subprocess.Popen(cmdvec, shell = False, \
> +                     stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=".", env=my_env)
> +        sout = child.stdout
> +        serr = child.stderr
> +        ofd = sout.fileno()
> +        efd = serr.fileno()
> +        oeof = False
> +        eeof = False
> +        check_errors = []
> +        self.SetNonblocking(ofd)
> +        self.SetNonblocking(efd)
> +        while True:
> +            ready = select.select([ofd,efd],[],[],0.1)
> +            if ofd in ready[0]:
> +                if child.poll() != None:
> +                    oeof = True
> +                oline = self.readline(True, ofd)
> +                while oline != '':
> +                    if ofilter:
> +                        ofilter(oline, verbose)
> +                    else:
> +                        sys.stdout.write(oline)
> +                    oline = self.readline(True, ofd)
> +            if efd in ready[0]:
> +                if child.poll() != None:
> +                    eeof = True
> +                eline = self.readline(False, efd)
> +                while eline != '':
> +                    if efilter:
> +                        check_err = efilter(eline, verbose)
> +                        if check_err != None:
> +                                check_errors.append(check_err)
> +                    else:
> +                        sys.stderr.write(eline)
> +                    eline = self.readline(False, efd)
> +            if oeof and eeof:
> +                break
> +        serr.close()
> +        sout.close()
> +        retcode = child.wait()
> +        if check_errors != []:
> +            estr = "".join(check_errors)
> +            if estr != "":
> +                sys.stderr.write(estr)
> +                if not retcode:
> +                    retcode = 131
> +            else:
> +                if verbose:
> +                    print "%s  ** %d suppressed errors/warnings from %s%s" % (BLUE, len(check_errors), self.name, ENDCOLOR)
> +                retcode = 0
> +        return retcode
> +
> +    def ParseOptional(self, cmd, argv):
> +        raise CheckError("Undefined command '%s' for checker '%s'" % (cmd, self.name))
> +
> +    # Called as final step before running the checker:
> +    def Postprocess(self):
> +        # Do nothing - just for redefinition in subclasses
> +        return
> +
> +    # Called as a post processing step after running the checker:
> +    # Input parameter is return value from Run()
> +    def PostRun(self, retval):
> +        # Do nothing - just for redefinition in subclasses
> +        return retval
> +
> +    # Default standard output filter:
> +    def suppress(self, line, verbose):
> +        if verbose:
> +            sys.stdout.write(line)
> +
> +    # A matching filter for stderr:
> +    def RegexFilter(self, line, verbose):
> +        if self.cont:
> +            m = re.match(self.cont[0], line)
> +            self.cont = self.cont[1:]
> +            if m:
> +                if self.last_ignore:
> +                    return ""
> +                else:
> +                    return line
> +
> +        for t, regex in self.re_except_def.iteritems():
> +            r = "^(.*:\d+:)\s(\w+:)\s(%s.*)$" % regex[0]
> +            m = re.match(r, line)
> +            if m:
> +                if len(regex) > 1:
> +                    self.cont = regex[1:]
> +                if t in self.file_except:
> +                    self.last_ignore = True
> +                    return ""
> +                else:
> +                    self.last_ignore = False
> +                    return "%s%s %s:%s%s%s: %s %s\n" % (BROWN, m.group(1), self.name.upper(), BLUE, t, ENDCOLOR, m.group(2), m.group(3))
> +        self.unclassified = self.unclassified + 1
> +        return RED + line + ENDCOLOR
> +
> +    def ListTypes(self):
> +        if len(self.re_except_def) > 0:
> +            print BLUE + BOLD + "  Check types declared for %s in runchecks configuration%s" % (self.name, ENDCOLOR)
> +        for t, regex in self.re_except_def.iteritems():
> +            print "\t%-22s %s" % (t, "\\n".join(regex))
> +        if len(self.re_except_def) > 0:
> +            print ""
> +        return 0
> +
> +    def addflags(self, argv):
> +        self.cmdvec += argv
> +
> +    def exception(self, type, relpath, argv):
> +        for f in argv:
> +            if f == ("%s%s" % (relpath, bfile)):
> +                self.exceptions.append(type)
> +
> +    def pervasive(self, argv):
> +        self.pervasive_opts += argv
> +
> +    def typedef(self, argv):
> +        exp = " ".join(argv[1:])
> +        elist = exp.split("\\n")
> +        self.re_except_def[argv[0]] = elist
> +
> +
> +# Individual checker implementations:
> +#
> +
> +# checkpatch
> +class CheckpatchRunner(Checker):
> +    def __init__(self, srctree, workdir):
> +        Checker.__init__(self, "checkpatch", "scripts/checkpatch.pl", srctree, workdir)
> +        self.cmdvec.append("--file")
> +        self.line_len = 0
> +        # checkpatch sends all it's warning and error output to stdout,
> +        # redirect and do limited filtering:
> +        self.ofilter = self.out_filter
> +
> +    def ParseOptional(self, cmd, argv):
> +        if cmd == "line_len":
> +            self.line_len = int(argv[0])
> +        else:
> +            Checker.ParseOptional(self, cmd, argv)
> +
> +    def Postprocess(self):
> +        if config.color:
> +            self.cmdvec.append("--color=always")
> +        if self.line_len:
> +            self.cmdvec.append("--max-line-length=%d" % self.line_len)
> +        if self.file_except:
> +            self.cmdvec.append("--ignore=%s" % ",".join(self.file_except))
> +
> +    # Extracting a condensed doc of types to filter on:
> +    def man_filter(self, line, verbose):
> +        t = line.split()
> +        if len(t) > 1 and t[1] != "Message":
> +            sys.stdout.write("\t%s\n" % t[1])
> +
> +    def out_filter(self, line, verbose):
> +        # --terse produces this message even with no errors,
> +        #  suppress unless run with -v:
> +        if not verbose and re.match("^total: 0 errors, 0 warnings, 0 checks,", line):
> +            return
> +        sys.write.stderr(line)
> +
> +    def ListTypes(self):
> +        print BLUE + BOLD + "  Supported check types for checkpatch" + ENDCOLOR
> +        # Parse help output:
> +        cmdvec = ["%s/scripts/checkpatch.pl" % self.srctree, "--list-types"]
> +        self.RunCommand(cmdvec, self.man_filter, None)
> +        print ""
> +        return 0
> +
> +# sparse
> +class SparseRunner(Checker):
> +    def __init__(self, srctree, workdir):
> +        Checker.__init__(self, "sparse", "sparse", srctree, workdir)
> +        self.efilter = self.RegexFilter
> +
> +    def sparse_name(self, rs_type):
> +        l_name = rs_type.lower()
> +        s_name = ""
> +        for c in l_name:
> +            if c == '_':
> +                s_name += '-'
> +            else:
> +                s_name += c
> +        return s_name
> +
> +    def runchecks_name(self, sparse_type):
> +        u_name = sparse_type.upper()
> +        rc_name =""
> +        for c in u_name:
> +            if c == '-':
> +                rc_name += '_'
> +            else:
> +                rc_name += c
> +        return rc_name
> +
> +    def Postprocess(self):
> +        if self.file_except:
> +            for e in self.file_except:
> +                self.cmdvec.append("-Wno-%s" % self.sparse_name(e))
> +
> +    # Extracting a condensed doc of types to filter on:
> +    def man_filter(self, line, verbose):
> +        if self.doc_next:
> +            doc = line.strip()
> +            self.doc[self.doc_next] = doc
> +            self.doc_next = False
> +            return
> +        match = re.search("^\s+-W([\w-]+)\s*$", line)
> +        if match:
> +            name = match.group(1)
> +            if re.match("sparse-", name):
> +                return
> +            rs_type = self.runchecks_name(name)
> +            self.doc_next = rs_type
> +
> +    def ListTypes(self):
> +        # Parse manual output:
> +        cmdvec = ["man", "sparse"]
> +        self.doc_next = False
> +        ret = self.RunCommand(cmdvec, self.man_filter, None)
> +        if ret:
> +            return ret
> +        print BLUE + BOLD + "\n  Types derived from sparse from documentation in manpage" + ENDCOLOR
> +        for t, doc in self.doc.iteritems():
> +            print "\t%-22s %s" % (t, doc)
> +            try:
> +                regex = self.re_except_def[t]
> +                print "\t%-22s %s" % ("", GREEN + "\\n".join(regex) + ENDCOLOR)
> +            except:
> +                print "\t%-22s %s" % ("", RED + "(regex match (typedef) missing)" + ENDCOLOR)
> +        print BLUE + BOLD + "\n  Types for sparse only declared for runchecks or not documented in manpage" + ENDCOLOR
> +        for t, regex in self.re_except_def.iteritems():
> +            try:
> +                self.doc[t]
> +            except:
> +                print "\t%-22s %s" % (t, GREEN + "\\n".join(regex) + ENDCOLOR)
> +        print ""
> +        return 0
> +
> +# checkdoc
> +class CheckdocRunner(Checker):
> +    def __init__(self, srctree, workdir):
> +        Checker.__init__(self, "checkdoc", "scripts/kernel-doc", srctree, workdir)
> +        self.cmdvec.append("-none")
> +        self.efilter = self.RegexFilter
> +
> +# coccicheck (coccinelle) (WIP)
> +class CoccicheckRunner(Checker):
> +    def __init__(self, srctree, workdir):
> +        Checker.__init__(self, "coccicheck", "scripts/coccicheck", srctree, workdir)
> +        self.debug_file = None
> +        self.efilter = self.CoccicheckFilter
> +
> +    def filter_env(self, dict):
> +        newdict = os.environ
> +        # If debug file is not set by the user, override it and present the output on stderr:
> +        try:
> +            df = newdict["DEBUG_FILE"]
> +        except:
> +            print "*** debug_file!"
> +            self.debug_file = '/tmp/cocci_%s.log' % os.getpid()
> +            newdict["DEBUG_FILE"] = self.debug_file
> +        return newdict
> +
> +    def CoccicheckFilter(self, line, verbose):
> +        self.unclassified = self.unclassified + 1
> +        if re.match(".*spatch -D report", line):
> +            if verbose:
> +                sys.stdout.write(line)
> +        else:
> +            return RED + line + ENDCOLOR
> +
> +    def PostRun(self, retval):
> +        if not self.debug_file:
> +            return retval
> +        f = open(self.debug_file)
> +        for line in f:
> +            line = self.CoccicheckFilter(line, verbose)
> +            if line:
> +                sys.stderr.write(line)
> +        f.close()
> +        if self.debug_file:
> +            os.remove(self.debug_file)
> +        if retval == 0:
> +            reval = ret
> +        return retval
> +
> +checker_types = {}
> +
> +def AddChecker(checker):
> +    checker_types[checker.name] = checker
> +
> +#
> +# Start main program:
> +#
> +program = os.path.realpath(sys.argv[0])
> +progname = basename(program)
> +scriptsdir = dirname(program)
> +srctree = dirname(scriptsdir)
> +force = False
> +ignore_config = False
> +verbose = False
> +debug = False
> +error = True
> +error_on_red = False
> +usage_only = False
> +argv = []
> +c_argv = []
> +fw_opts = []
> +workdir = os.getcwd()
> +optarg = False
> +argc = 0
> +
> +AddChecker(CheckpatchRunner(srctree, workdir))
> +AddChecker(SparseRunner(srctree, workdir))
> +AddChecker(CheckdocRunner(srctree, workdir))
> +AddChecker(CoccicheckRunner(srctree, workdir))
> +
> +for arg in sys.argv[1:]:
> +    argc = argc + 1
> +
> +    if arg == "--":
> +        argc = argc + 1
> +        c_argv = sys.argv[argc:]
> +        break;
> +    elif arg == "-f":
> +        force = True
> +    elif arg == "-n":
> +        ignore_config = True
> +        force = True
> +    elif arg == "-w":
> +        error = False
> +    elif arg == "-t":
> +        error_on_red = True
> +        error = False
> +    elif arg == "-d":
> +        debug = True
> +    elif arg == "-v":
> +        verbose = True
> +    elif arg == "-h":
> +        usage_only = True
> +    else:
> +        opt = re.match("^-.*$", arg)
> +        if opt:
> +            # Delay processing of these until we know the configuration:
> +            fw_opts.append(opt.group(0))
> +        else:
> +            argv.append(arg)
> +
> +if not verbose:
> +    try:
> +        verb = int(os.environ["V"])
> +        if verb != 0:
> +            verbose = True
> +    except KeyError:
> +        verbose = False
> +
> +if not os.path.exists(os.path.join(srctree, "MAINTAINERS")):
> +    srctree = None
> +
> +try:
> +    file = argv[0]
> +    bfile = basename(file)
> +    workdir = dirname(file)
> +except:
> +    bfile = None
> +    file = None
> +
> +unclassified = 0
> +
> +if debug:
> +    print "Kernel root:\t%s\nFile:\t\t%s\nWorkdir:\t%s" % \
> +        (srctree, bfile, workdir)
> +    print "C args:\t\t%s\nargv:\t\t%s\n" % (" ".join(c_argv), " ".join(argv))
> +
> +try:
> +    config = Config(srctree, workdir, "runchecks.cfg")
> +    config.ProcessOpts(fw_opts)
> +
> +    if usage_only:
> +        usage()
> +    if not config.HasPathConfig() and not config.list_only and not force:
> +        if verbose:
> +            print "  ** %s: No configuration found - skip checks for %s" % (progname, file)
> +        exit(0)
> +
> +    if config.color:
> +        GREEN = '\033[32m'
> +        RED = '\033[91m'
> +        BROWN = '\033[33m'
> +        BLUE = '\033[34m'
> +        BOLD = '\033[1m'
> +        ENDCOLOR = '\033[0m'
> +    else:
> +        BOLD = ''
> +        GREEN = ''
> +        RED = ''
> +        BROWN = ''
> +        BLUE = ''
> +        ENDCOLOR = ''
> +
> +    ret = 0
> +    for checker in config.checkers:
> +        if config.list_only:
> +            ret = checker.ListTypes()
> +        else:
> +            ret = checker.Run(file, verbose)
> +            unclassified += checker.unclassified
> +        if ret and error:
> +            break
> +
> +    if not error and not (error_on_red and unclassified > 0):
> +        ret = 0
> +except CheckError, e:
> +    print "  ** %s: %s" % (progname, str(e))
> +    ret = 22
> +except KeyboardInterrupt:
> +    if verbose:
> +        print "  ** %s: Interrupted by user" % progname
> +    ret = 4
> +
> +exit(ret)
> diff --git a/scripts/runchecks.cfg b/scripts/runchecks.cfg
> new file mode 100644
> index 0000000..c0b12cf
> --- /dev/null
> +++ b/scripts/runchecks.cfg
> @@ -0,0 +1,63 @@
> +checker checkpatch
> +addflags  --quiet --show-types --strict --emacs
> +line_len 110
> +
> +checker sparse
> +addflags -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wsparse-all
> +cflags
> +
> +#	Name		Regular expression for matching in checker output
> +typedef DECL		symbol '.*' was not declared. Should it be static\?
> +typedef SHADOW		symbol '\w+' shadows an earlier one\n.*originally declared here
> +typedef TYPESIGN	incorrect type in argument \d+ \(different signedness\)\n.*expected\n.*got
> +typedef RETURN_VOID	returning void-valued expression
> +typedef SIZEOF_BOOL	expression using sizeof bool
> +typedef CONTEXT		context imbalance in '.*'
> +typedef MEMCPY_MAX_COUNT \w+ with byte count of
> +typedef CAST_TO_AS	cast adds address space to expression
> +typedef ADDRESS_SPACE	incorrect type in .* \(different address spaces\)\n.*expected\n.*got
> +typedef PTR_INHERIT	incorrect type in .* \(different base types\)\n.*expected\n.*got
> +typedef PTR_SUBTRACTION_BLOWS potentially expensive pointer subtraction
> +typedef VLA		Variable length array is used
> +typedef OVERFLOW	constant [x\dA-F]+ is so big it is \w+
> +typedef TAUTOLOGICAL_COMPARE self-comparison always evaluates to (true|false)
> +typedef NON_POINTER_NULL Using plain integer as NULL pointer
> +typedef BOOL_CAST_RESTRICTED restricted \w+ degrades to integer
> +typedef TYPESIGN	incorrect type in .* \(different signedness\)\n.*expected\n.*got
> +typedef FUNCTION_REDECL symbol '.*' redeclared with different type \(originally declared at
> +typedef COND_ADDRESS_ARRAY the address of an array will always evaluate as true
> +typedef BITWISE 	cast (to|from) restricted
> +
> +# Type names invented here - not maskable from sparse?
> +typedef NO_DEREF	dereference of noderef expression
> +typedef ARG_TYPE_MOD	incorrect type in .* \(different modifiers\)\n.*expected\n.*got
> +typedef ARG_TYPE_COMP	incorrect type in .* \(incompatible .*\(.*\)\)\n.*expected\n.*got
> +typedef ARG_AS_COMP	incompatible types in comparison expression \(different address spaces\)
> +typedef CMP_TYPE	incompatible types in comparison expression \(different base types\)
> +typedef SPARSE_OFF	"Sparse checking disabled for this file"
> +typedef CAST_TRUNC	cast truncates bits from constant value
> +typedef CAST_FROM_AS	cast removes address space of expression
> +typedef EXT_LINK_DEF	function '\w+' with external linkage has definition
> +typedef FUNC_ARITH	arithmetics on pointers to functions
> +typedef CALL_NO_TYPE	call with no type!
> +typedef FUNC_SUB	subtraction of functions\? Share your drugs
> +typedef STRING_CONCAT	trying to concatenate \d+-character string \(\d+ bytes max\)
> +typedef INARG_DIRECTIVE directive in argument list
> +typedef NONSCALAR_CAST  cast (to|from) non-scalar
> +
> +checker checkdoc
> +typedef PARAM_DESC	No description found for parameter
> +typedef X_PARAM    	Excess function parameter
> +typedef X_STRUCT	Excess struct member
> +typedef FUN_PROTO    	cannot understand function prototype
> +typedef DOC_FORMAT   	Incorrect use of kernel-doc format
> +typedef BAD_LINE	bad line
> +typedef AMBIGUOUS	Cannot understand.*\n on line
> +typedef BOGUS_STRUCT	Cannot parse struct or union
> +typedef DUPL_SEC	duplicate section name
> +
> +checker coccicheck
> +cflags
> +
> +run sparse checkpatch checkdoc
> +#run all
> diff --git a/scripts/runchecks_help.txt b/scripts/runchecks_help.txt
> new file mode 100644
> index 0000000..a0a4a34
> --- /dev/null
> +++ b/scripts/runchecks_help.txt
> @@ -0,0 +1,43 @@
> +Usage: runchecks  [<options>] c_file [-- <c_parameters>]
> +  - run code checkers in a conformant way.
> +
> +Options:
> +  -h|--help	List this text
> +  --list	List the different configured checkers and the list of interpreted check
> +		types for each of them.
> +  --		Separator between parameters to runchecks and compiler parameters to be
> +		passed directly to the checkers.
> +  --run:[checker1[,checker2..]|all]
> +		Override the default set of checkers to be run for each source file. By
> +		default the checkers to run will be the intersection of the checkers
> +		configured by ``run`` commands in the configuration file and the
> +		checkers that is actually available on the machine. Use 'all'
> +		to run all the configured checkers.
> +  --color	Use coloring in the error and warning output. In this mode
> +		output from checkers that are supported by typedefs but not
> +		captured by any such will be highlighted in red to make it
> +		easy to detect that a typedef rule is missing. See -t below.
> +  -f		Force mode: force runchecks to run a full run in directories/trees
> +		where runchecks does not find a	runchecks.cfg file. The default
> +		behaviour is to skip running checkers in directories/trees
> +		where no matching runchecks.cfg file is found either in the
> +		source file directory or above.
> +  -n		Ignore all runchecks.cfg files except the one in scripts,
> +		which are used for basic runchecks configuration. This allows
> +		an easy way to run a "bare" version of checking where all
> +		issues are reported, even those intended to be suppressed.
> +		Implicitly enables force mode.
> +  -w		Behave as if 0 on exit from all checkers. Normally
> +		runchecks will fail on the first checker to produce errors or
> +		warnings, in fact anything that produces not suppressed
> +		output on stderr. This is to make it easy to work interactively,
> +		avoiding overlooking anything, but sometimes it is useful to
> +		be able to produce a full report of status.
> +  -t		Typedef setup mode: For checkers where runchecks enable typedefs:
> +		Behaves as -w except for stderr output that is not captured
> +		by any typedefs. This is a convenience mode while
> +		fixing/improving typedef setup. Use with --color to get red
> +		output for the statements to capture with new typedefs.
> +  -v		Verbose output. Also enabled if called from make with V=1,
> +		but it is useful to be able to only enable verbose mode for runchecks.
> +  -d		Debugging output - more verbose.

-- 
Jani Nikula, Intel Open Source Technology Center