[axboe-block:misc-next 3/3] mm/slab_common.c:1326:5: warning: no previous prototype for 'should_failslab'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git misc-next
head:   43d923f7b1db8b930041fd2d3fe174991592a6da
commit: 43d923f7b1db8b930041fd2d3fe174991592a6da [3/3] mm: don't call should_failslab() for !CONFIG_FAILSLAB
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?id=43d923f7b1db8b930041fd2d3fe174991592a6da
        git remote add axboe-block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
        git fetch --no-tags axboe-block misc-next
        git checkout 43d923f7b1db8b930041fd2d3fe174991592a6da
        # save the attached .config to linux build tree
        make W=1 ARCH=um SUBARCH=x86_64

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

All warnings (new ones prefixed by >>):

>> mm/slab_common.c:1326:5: warning: no previous prototype for 'should_failslab' [-Wmissing-prototypes]
    1326 | int should_failslab(struct kmem_cache *s, gfp_t gfpflags)
         |     ^~~~~~~~~~~~~~~


vim +/should_failslab +1326 mm/slab_common.c

4f6923fbb352d1 Howard McLauchlan 2018-04-05  1325  
4f6923fbb352d1 Howard McLauchlan 2018-04-05 @1326  int should_failslab(struct kmem_cache *s, gfp_t gfpflags)

:::::: The code at line 1326 was first introduced by commit
:::::: 4f6923fbb352d126659cabe34806cff75c7b5ea0 mm: make should_failslab always available for fault injection

:::::: TO: Howard McLauchlan <hmclauchlan@xxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

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