[PATCH 2/2] string.h: fix incompatibility between FORTIFY_SOURCE and KASAN

[kbuild test robot]

Hi Daniel,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linux/master]
[also build test WARNING on arm64/for-next/core powerpc/next s390/features tip/x86/core linus/master v5.5-rc6 next-20200110]
[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/Daniel-Axtens/Fix-some-incompatibilites-between-KASAN-and-FORTIFY_SOURCE/20200116-172838
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 1522d9da40bdfe502c91163e6d769332897201fa
config: x86_64-randconfig-s1-20200116 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-3) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> mm/kasan/common.o: warning: objtool: __kasan_slab_free()+0xea: unreachable instruction

---
0-DAY kernel test infrastructure                 Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation
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