Re: [PATCH 1/3] ftrace: Add module to ftrace_make_call() parameters

From: kbuild test robot
Date: Sun Feb 25 2018 - 06:54:30 EST

Hi Alexander,

I love your patch! Yet something to improve:

[auto build test ERROR on tip/perf/core]
[also build test ERROR on v4.16-rc2 next-20180223]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Alexander-Sverdlin/ARM-Implement-MODULE_PLT-support-in-FTRACE/20180225-191957
config: x86_64-randconfig-x011-201808 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

All error/warnings (new ones prefixed by >>):

kernel/trace/ftrace.c: In function 'ftrace_module_enable':
>> kernel/trace/ftrace.c:5851:39: error: passing argument 1 of '__ftrace_replace_code' from incompatible pointer type [-Werror=incompatible-pointer-types]
int failed = __ftrace_replace_code(rec, 1);
^~~
kernel/trace/ftrace.c:2424:1: note: expected 'struct module *' but argument is of type 'struct dyn_ftrace *'
__ftrace_replace_code(struct module *mod, struct dyn_ftrace *rec, int enable)
^~~~~~~~~~~~~~~~~~~~~
>> kernel/trace/ftrace.c:5851:44: warning: passing argument 2 of '__ftrace_replace_code' makes pointer from integer without a cast [-Wint-conversion]
int failed = __ftrace_replace_code(rec, 1);
^
kernel/trace/ftrace.c:2424:1: note: expected 'struct dyn_ftrace *' but argument is of type 'int'
__ftrace_replace_code(struct module *mod, struct dyn_ftrace *rec, int enable)
^~~~~~~~~~~~~~~~~~~~~
>> kernel/trace/ftrace.c:5851:17: error: too few arguments to function '__ftrace_replace_code'
int failed = __ftrace_replace_code(rec, 1);
^~~~~~~~~~~~~~~~~~~~~
kernel/trace/ftrace.c:2424:1: note: declared here
__ftrace_replace_code(struct module *mod, struct dyn_ftrace *rec, int enable)
^~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +/__ftrace_replace_code +5851 kernel/trace/ftrace.c

93eb677d Steven Rostedt 2009-04-15 5797
7dcd182b Jessica Yu 2016-02-16 5798 void ftrace_module_enable(struct module *mod)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5799) {
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5800) struct dyn_ftrace *rec;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5801) struct ftrace_page *pg;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5802)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5803) mutex_lock(&ftrace_lock);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5804)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5805) if (ftrace_disabled)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5806) goto out_unlock;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5807)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5808) /*
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5809) * If the tracing is enabled, go ahead and enable the record.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5810) *
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5811) * The reason not to enable the record immediatelly is the
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5812) * inherent check of ftrace_make_nop/ftrace_make_call for
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5813) * correct previous instructions. Making first the NOP
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5814) * conversion puts the module to the correct state, thus
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5815) * passing the ftrace_make_call check.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5816) *
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5817) * We also delay this to after the module code already set the
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5818) * text to read-only, as we now need to set it back to read-write
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5819) * so that we can modify the text.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5820) */
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5821) if (ftrace_start_up)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5822) ftrace_arch_code_modify_prepare();
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5823)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5824) do_for_each_ftrace_rec(pg, rec) {
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5825) int cnt;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5826) /*
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5827) * do_for_each_ftrace_rec() is a double loop.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5828) * module text shares the pg. If a record is
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5829) * not part of this module, then skip this pg,
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5830) * which the "break" will do.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5831) */
3e234289 Steven Rostedt (VMware 2017-03-03 5832) if (!within_module_core(rec->ip, mod) &&
3e234289 Steven Rostedt (VMware 2017-03-03 5833) !within_module_init(rec->ip, mod))
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5834) break;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5835)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5836) cnt = 0;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5837)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5838) /*
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5839) * When adding a module, we need to check if tracers are
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5840) * currently enabled and if they are, and can trace this record,
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5841) * we need to enable the module functions as well as update the
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5842) * reference counts for those function records.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5843) */
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5844) if (ftrace_start_up)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5845) cnt += referenced_filters(rec);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5846)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5847) /* This clears FTRACE_FL_DISABLED */
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5848) rec->flags = cnt;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5849)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5850) if (ftrace_start_up && cnt) {
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 @5851) int failed = __ftrace_replace_code(rec, 1);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5852) if (failed) {
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5853) ftrace_bug(failed, rec);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5854) goto out_loop;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5855) }
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5856) }
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5857)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5858) } while_for_each_ftrace_rec();
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5859)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5860) out_loop:
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5861) if (ftrace_start_up)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5862) ftrace_arch_code_modify_post_process();
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5863)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5864) out_unlock:
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5865) mutex_unlock(&ftrace_lock);
d7fbf8df Steven Rostedt (VMware 2017-06-26 5866)
d7fbf8df Steven Rostedt (VMware 2017-06-26 5867) process_cached_mods(mod->name);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5868) }
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5869)

:::::: The code at line 5851 was first introduced by commit
:::::: b7ffffbb46f205e7727a18bcc7a46c3c2b534f7c ftrace: Add infrastructure for delayed enabling of module functions

:::::: TO: Steven Rostedt (Red Hat) <rostedt@xxxxxxxxxxx>
:::::: CC: Steven Rostedt <rostedt@xxxxxxxxxxx>

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