tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 15e5b1b566ed0689093effb31f13fe29e4c9905a commit: 5196456ab776a5974d24994aea1b20afe0c8d020 [5871/6146] slab.h: sprinkle __assume_aligned attributes config: sparc64-defconfig (attached as .config) reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 5196456ab776a5974d24994aea1b20afe0c8d020 # save the attached .config to linux build tree make.cross ARCH=sparc64 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): In file included from arch/sparc/include/asm/string.h:4:0, from include/linux/string.h:17, from include/linux/dynamic_debug.h:111, from include/linux/printk.h:277, from include/linux/kernel.h:13, from include/linux/list.h:8, from include/linux/module.h:9, from drivers/net/ethernet/broadcom/tg3.c:19: drivers/net/ethernet/broadcom/tg3.c: In function 'tg3_set_eeprom': >> arch/sparc/include/asm/string_64.h:25:25: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] #define memcpy(t, f, n) __builtin_memcpy(t, f, n) ^ drivers/net/ethernet/broadcom/tg3.c:12021:9: note: 'start' was declared here __be32 start, end; ^ vim +/start +25 arch/sparc/include/asm/string_64.h f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 9 #ifndef __SPARC64_STRING_H__ f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 10 #define __SPARC64_STRING_H__ f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 11 f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 12 /* Really, userland/ksyms should not see any of this stuff. */ f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 13 f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 14 #ifdef __KERNEL__ f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 15 f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 16 #include <asm/asi.h> f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 17 f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 18 #ifndef EXPORT_SYMTAB_STROPS f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 19 f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 20 /* First the mem*() things. */ f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 21 #define __HAVE_ARCH_MEMMOVE f05a6865 arch/sparc/include/asm/string_64.h Sam Ravnborg 2014-05-16 22 void *memmove(void *, const void *, __kernel_size_t); f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 23 f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 24 #define __HAVE_ARCH_MEMCPY 4d14a459 arch/sparc/include/asm/string_64.h David S. Miller 2009-12-10 @25 #define memcpy(t, f, n) __builtin_memcpy(t, f, n) f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 26 f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 27 #define __HAVE_ARCH_MEMSET 4d14a459 arch/sparc/include/asm/string_64.h David S. Miller 2009-12-10 28 #define memset(s, c, count) __builtin_memset(s, c, count) f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 29 f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 30 #define __HAVE_ARCH_MEMSCAN f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 31 f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 32 #undef memscan f5e706ad include/asm-sparc/string_64.h Sam Ravnborg 2008-07-17 33 #define memscan(__arg0, __char, __arg2) \ :::::: The code at line 25 was first introduced by commit :::::: 4d14a459857bd151ecbd14bcd37b4628da00792b sparc: Stop trying to be so fancy and use __builtin_{memcpy,memset}() :::::: TO: David S. Miller <davem@xxxxxxxxxxxxx> :::::: CC: David S. Miller <davem@xxxxxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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