Re: [PATCH] tracing: Remove unnecessary DEBUG_FS dependency

[kbuild test robot]

Hi Kusanagi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/perf/core]
[also build test ERROR on v5.4-rc8 next-20191120]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Kusanagi-Kouichi/tracing-Remove-unnecessary-DEBUG_FS-dependency/20191121-032827
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 8f6ee51d772d0dab407d868449d2c5d9c8d2b6fc
config: arm-exynos_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   kernel/trace/trace.c: In function 'tracing_init_dentry':
>> kernel/trace/trace.c:8658:9: error: passing argument 3 of 'debugfs_create_automount' from incompatible pointer type [-Werror=incompatible-pointer-types]
            trace_automount, NULL);
            ^~~~~~~~~~~~~~~
   In file included from kernel/trace/trace.c:24:0:
   include/linux/debugfs.h:204:30: note: expected 'struct vfsmount * (*)(void *)' but argument is of type 'struct vfsmount * (*)(struct dentry *, void *)'
    static inline struct dentry *debugfs_create_automount(const char *name,
                                 ^~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/debugfs_create_automount +8658 kernel/trace/trace.c

f76180bc07abc3 Steven Rostedt (Red Hat  2015-01-20  8630) 
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8631) /**
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8632)  * tracing_init_dentry - initialize top level trace array
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8633)  *
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8634)  * This is called when creating files or directories in the tracing
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8635)  * directory. It is called via fs_initcall() by any of the boot up code
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8636)  * and expects to return the dentry of the top level tracing directory.
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8637)  */
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8638) struct dentry *tracing_init_dentry(void)
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8639) {
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8640) 	struct trace_array *tr = &global_trace;
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8641) 
f76180bc07abc3 Steven Rostedt (Red Hat  2015-01-20  8642) 	/* The top level trace array uses  NULL as parent */
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8643) 	if (tr->dir)
f76180bc07abc3 Steven Rostedt (Red Hat  2015-01-20  8644) 		return NULL;
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8645) 
8b1291994d8e5e Jiaxing Wang             2015-11-06  8646  	if (WARN_ON(!tracefs_initialized()) ||
8b1291994d8e5e Jiaxing Wang             2015-11-06  8647  		(IS_ENABLED(CONFIG_DEBUG_FS) &&
8b1291994d8e5e Jiaxing Wang             2015-11-06  8648  		 WARN_ON(!debugfs_initialized())))
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8649) 		return ERR_PTR(-ENODEV);
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8650) 
f76180bc07abc3 Steven Rostedt (Red Hat  2015-01-20  8651) 	/*
f76180bc07abc3 Steven Rostedt (Red Hat  2015-01-20  8652) 	 * As there may still be users that expect the tracing
f76180bc07abc3 Steven Rostedt (Red Hat  2015-01-20  8653) 	 * files to exist in debugfs/tracing, we must automount
f76180bc07abc3 Steven Rostedt (Red Hat  2015-01-20  8654) 	 * the tracefs file system there, so older tools still
f76180bc07abc3 Steven Rostedt (Red Hat  2015-01-20  8655) 	 * work with the newer kerenl.
f76180bc07abc3 Steven Rostedt (Red Hat  2015-01-20  8656) 	 */
f76180bc07abc3 Steven Rostedt (Red Hat  2015-01-20  8657) 	tr->dir = debugfs_create_automount("tracing", NULL,
f76180bc07abc3 Steven Rostedt (Red Hat  2015-01-20 @8658) 					   trace_automount, NULL);
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8659) 
8434dc9340cd2e Steven Rostedt (Red Hat  2015-01-20  8660) 	return NULL;
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8661) }
7eeafbcab47fe9 Steven Rostedt (Red Hat  2015-01-26  8662) 

:::::: The code at line 8658 was first introduced by commit
:::::: f76180bc07abc399977bfbe8c43bf58c4570e893 tracing: Automatically mount tracefs on debugfs/tracing

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

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