Hi Gavin, [auto build test WARNING on net-next/master]
url: https://github.com/0day-ci/linux/commits/Gavin-Shan/net-ncsi-Add-debugging-functionality/20170503-185932 config: alpha-allyesconfig (attached as .config) compiler: alpha-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705 reproduce: wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=alpha 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 include/linux/string.h:18:0, from include/linux/bitmap.h:8, from include/linux/nodemask.h:94, from include/linux/mmzone.h:16, from include/linux/gfp.h:5, from include/linux/kmod.h:22, from include/linux/module.h:13, from net/ncsi/ncsi-ethtool.c:10: net/ncsi/ncsi-ethtool.c: In function 'ncsi_get_channel_info': >> arch/alpha/include/asm/string.h:21:16: warning: 'dest' may be used >> uninitialized in this function [-Wmaybe-uninitialized] #define memcpy __builtin_memcpy ^~~~~~~~~~~~~~~~ net/ncsi/ncsi-ethtool.c:106:9: note: 'dest' was declared here void *dest; ^~~~ net/ncsi/ncsi-ethtool.c:105:26: warning: 'd_idx' may be used uninitialized in this function [-Wmaybe-uninitialized] int entry_size, s_idx, d_idx; ^~~~~ net/ncsi/ncsi-ethtool.c:148:18: warning: 'p_valid_bits' may be used uninitialized in this function [-Wmaybe-uninitialized] *p_valid_bits |= (1 << d_idx); ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~ -- In file included from include/linux/string.h:18:0, from include/linux/bitmap.h:8, from include/linux/nodemask.h:94, from include/linux/mmzone.h:16, from include/linux/gfp.h:5, from include/linux/kmod.h:22, from include/linux/module.h:13, from net//ncsi/ncsi-ethtool.c:10: net//ncsi/ncsi-ethtool.c: In function 'ncsi_get_channel_info': >> arch/alpha/include/asm/string.h:21:16: warning: 'dest' may be used >> uninitialized in this function [-Wmaybe-uninitialized] #define memcpy __builtin_memcpy ^~~~~~~~~~~~~~~~ net//ncsi/ncsi-ethtool.c:106:9: note: 'dest' was declared here void *dest; ^~~~ net//ncsi/ncsi-ethtool.c:105:26: warning: 'd_idx' may be used uninitialized in this function [-Wmaybe-uninitialized] int entry_size, s_idx, d_idx; ^~~~~ net//ncsi/ncsi-ethtool.c:148:18: warning: 'p_valid_bits' may be used uninitialized in this function [-Wmaybe-uninitialized] *p_valid_bits |= (1 << d_idx); ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~ vim +/dest +21 arch/alpha/include/asm/string.h ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 5 ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 6 /* ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 7 * GCC of any recent vintage doesn't do stupid things with bcopy. ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 8 * EGCS 1.1 knows all about expanding memcpy inline, others don't. ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 9 * ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 10 * Similarly for a memset with data = 0. ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 11 */ ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 12 ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 13 #define __HAVE_ARCH_MEMCPY ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 14 extern void * memcpy(void *, const void *, size_t); ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 15 #define __HAVE_ARCH_MEMMOVE ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 16 extern void * memmove(void *, const void *, size_t); ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 17 ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 18 /* For backward compatibility with modules. Unused otherwise. */ ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 19 extern void * __memcpy(void *, const void *, size_t); ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 20 ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 @21 #define memcpy __builtin_memcpy ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 22 ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 23 #define __HAVE_ARCH_MEMSET ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 24 extern void * __constant_c_memset(void *, unsigned long, size_t); a47e5bb5 arch/alpha/include/asm/string.h Richard Henderson 2013-07-11 25 extern void * ___memset(void *, int, size_t); ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 26 extern void * __memset(void *, int, size_t); ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 27 extern void * memset(void *, int, size_t); ^1da177e include/asm-alpha/string.h Linus Torvalds 2005-04-16 28 a47e5bb5 arch/alpha/include/asm/string.h Richard Henderson 2013-07-11 29 /* For gcc 3.x, we cannot have the inline function named "memset" because :::::: The code at line 21 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <torva...@ppc970.osdl.org> :::::: CC: Linus Torvalds <torva...@ppc970.osdl.org> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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