linux-kernel - [mcgrof:20220913-test-sysfs 9/11] fs/kernfs/kernfs-internal.h:239:43: warning: statement with no effect

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Date:   Wed, 14 Sep 2022 18:42:08 +0800
From:   kernel test robot <lkp@...el.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [mcgrof:20220913-test-sysfs 9/11]
 fs/kernfs/kernfs-internal.h:239:43: warning: statement with no effect

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git 20220913-test-sysfs
head:   fd13723170f4a2381aab0b6449920c121f01a10a
commit: 010fe7c173f104fbec6c1d56c3a92e2b88281ec8 [9/11] kernfs: add initial failure injection support
config: i386-randconfig-a001 (https://download.01.org/0day-ci/archive/20220914/202209141853.6zXXC9T7-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git/commit/?id=010fe7c173f104fbec6c1d56c3a92e2b88281ec8
        git remote add mcgrof https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git
        git fetch --no-tags mcgrof 20220913-test-sysfs
        git checkout 010fe7c173f104fbec6c1d56c3a92e2b88281ec8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash fs/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from fs/kernfs/file.c:19:
   fs/kernfs/file.c: In function 'kernfs_fop_write_iter':
>> fs/kernfs/kernfs-internal.h:239:43: warning: statement with no effect [-Wunused-value]
     239 | #define may_wait_kernfs_debug(func, when) (false)
         |                                           ^
   fs/kernfs/file.c:320:9: note: in expansion of macro 'may_wait_kernfs_debug'
     320 |         may_wait_kernfs_debug(kernfs_fop_write_iter, at_start);
         |         ^~~~~~~~~~~~~~~~~~~~~
>> fs/kernfs/kernfs-internal.h:239:43: warning: statement with no effect [-Wunused-value]
     239 | #define may_wait_kernfs_debug(func, when) (false)
         |                                           ^
   fs/kernfs/file.c:343:9: note: in expansion of macro 'may_wait_kernfs_debug'
     343 |         may_wait_kernfs_debug(kernfs_fop_write_iter, before_mutex);
         |         ^~~~~~~~~~~~~~~~~~~~~
>> fs/kernfs/kernfs-internal.h:239:43: warning: statement with no effect [-Wunused-value]
     239 | #define may_wait_kernfs_debug(func, when) (false)
         |                                           ^
   fs/kernfs/file.c:351:9: note: in expansion of macro 'may_wait_kernfs_debug'
     351 |         may_wait_kernfs_debug(kernfs_fop_write_iter, after_mutex);
         |         ^~~~~~~~~~~~~~~~~~~~~
>> fs/kernfs/kernfs-internal.h:239:43: warning: statement with no effect [-Wunused-value]
     239 | #define may_wait_kernfs_debug(func, when) (false)
         |                                           ^
   fs/kernfs/file.c:359:9: note: in expansion of macro 'may_wait_kernfs_debug'
     359 |         may_wait_kernfs_debug(kernfs_fop_write_iter, after_active);
         |         ^~~~~~~~~~~~~~~~~~~~~


vim +239 fs/kernfs/kernfs-internal.h

   233	
   234	#define may_wait_kernfs_debug(func, when) \
   235		__kernfs_debug_should_wait_func_name(func)(__kernfs_config_wait_var(func, when))
   236	void __kernfs_debug_should_wait_kernfs_fop_write_iter(bool evaluate);
   237	#else
   238	static inline void kernfs_init_failure_injection(void) {}
 > 239	#define may_wait_kernfs_debug(func, when) (false)
   240	#endif
   241	

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