[chrome-os:chromeos-5.4 15/93] include/linux/string.h:294:30: error: '__builtin_strncpy' specified bound 24 equals destination size

[kernel test robot <lkp@intel.com>]

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tree:   https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.4
head:   fbd5b376aef3491b453cfdefd1faa1f2f5ccc240
commit: d7438be1154b21bdd4472a1cfd86395334764b89 [15/93] UPSTREAM: drm/i915/gem: Don't leak non-persistent requests on changing engines
config: i386-randconfig-r035-20200710 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce (this is a W=1 build):
        git checkout d7438be1154b21bdd4472a1cfd86395334764b89
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

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

All errors (new ones prefixed by >>):

   In file included from arch/x86/include/asm/page_32.h:35,
                    from arch/x86/include/asm/page.h:14,
                    from arch/x86/include/asm/thread_info.h:12,
                    from include/linux/thread_info.h:38,
                    from arch/x86/include/asm/preempt.h:7,
                    from include/linux/preempt.h:78,
                    from include/linux/spinlock.h:51,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:6,
                    from include/linux/slab.h:15,
                    from include/linux/io-mapping.h:10,
                    from drivers/gpu/drm/i915/gt/intel_gtt.h:19,
                    from drivers/gpu/drm/i915/gt/gen6_ppgtt.h:9,
                    from drivers/gpu/drm/i915/gem/i915_gem_context.c:72:
   In function 'strncpy',
       inlined from 'mock_context' at drivers/gpu/drm/i915/gem/selftests/mock_context.c:40:3:
>> include/linux/string.h:294:30: error: '__builtin_strncpy' specified bound 24 equals destination size [-Werror=stringop-truncation]
     294 | #define __underlying_strncpy __builtin_strncpy
         |                              ^
   include/linux/string.h:304:9: note: in expansion of macro '__underlying_strncpy'
     304 |  return __underlying_strncpy(p, q, size);
         |         ^~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +/__builtin_strncpy +294 include/linux/string.h

b008ae4cc74d3a Daniel Axtens 2020-06-03  272  
b008ae4cc74d3a Daniel Axtens 2020-06-03  273  #ifdef CONFIG_KASAN
b008ae4cc74d3a Daniel Axtens 2020-06-03  274  extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr);
b008ae4cc74d3a Daniel Axtens 2020-06-03  275  extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp);
b008ae4cc74d3a Daniel Axtens 2020-06-03  276  extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy);
b008ae4cc74d3a Daniel Axtens 2020-06-03  277  extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove);
b008ae4cc74d3a Daniel Axtens 2020-06-03  278  extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset);
b008ae4cc74d3a Daniel Axtens 2020-06-03  279  extern char *__underlying_strcat(char *p, const char *q) __RENAME(strcat);
b008ae4cc74d3a Daniel Axtens 2020-06-03  280  extern char *__underlying_strcpy(char *p, const char *q) __RENAME(strcpy);
b008ae4cc74d3a Daniel Axtens 2020-06-03  281  extern __kernel_size_t __underlying_strlen(const char *p) __RENAME(strlen);
b008ae4cc74d3a Daniel Axtens 2020-06-03  282  extern char *__underlying_strncat(char *p, const char *q, __kernel_size_t count) __RENAME(strncat);
b008ae4cc74d3a Daniel Axtens 2020-06-03  283  extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size) __RENAME(strncpy);
b008ae4cc74d3a Daniel Axtens 2020-06-03  284  #else
b008ae4cc74d3a Daniel Axtens 2020-06-03  285  #define __underlying_memchr	__builtin_memchr
b008ae4cc74d3a Daniel Axtens 2020-06-03  286  #define __underlying_memcmp	__builtin_memcmp
b008ae4cc74d3a Daniel Axtens 2020-06-03  287  #define __underlying_memcpy	__builtin_memcpy
b008ae4cc74d3a Daniel Axtens 2020-06-03  288  #define __underlying_memmove	__builtin_memmove
b008ae4cc74d3a Daniel Axtens 2020-06-03  289  #define __underlying_memset	__builtin_memset
b008ae4cc74d3a Daniel Axtens 2020-06-03  290  #define __underlying_strcat	__builtin_strcat
b008ae4cc74d3a Daniel Axtens 2020-06-03  291  #define __underlying_strcpy	__builtin_strcpy
b008ae4cc74d3a Daniel Axtens 2020-06-03  292  #define __underlying_strlen	__builtin_strlen
b008ae4cc74d3a Daniel Axtens 2020-06-03  293  #define __underlying_strncat	__builtin_strncat
b008ae4cc74d3a Daniel Axtens 2020-06-03 @294  #define __underlying_strncpy	__builtin_strncpy
b008ae4cc74d3a Daniel Axtens 2020-06-03  295  #endif
b008ae4cc74d3a Daniel Axtens 2020-06-03  296  

:::::: The code at line 294 was first introduced by commit
:::::: b008ae4cc74d3ab43074099746f6c32d353e01aa string.h: fix incompatibility between FORTIFY_SOURCE and KASAN

:::::: TO: Daniel Axtens <dja@axtens.net>
:::::: CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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