Hi, [auto build test WARNING on scsi/for-next] [also build test WARNING on v4.7-rc3 next-20160614] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Charles-Chiou/scsi-stex-c-Support-Pegasus-3-product/20160614-142621 base: https://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git for-next config: i386-allmodconfig (attached as .config) compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430 reproduce: # save the attached .config to linux build tree make ARCH=i386 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/x86/include/asm/string.h:2:0, from include/linux/string.h:18, from arch/x86/include/asm/page_32.h:34, from arch/x86/include/asm/page.h:13, from arch/x86/include/asm/thread_info.h:11, from include/linux/thread_info.h:54, from arch/x86/include/asm/preempt.h:6, from include/linux/preempt.h:59, from include/linux/spinlock.h:50, from include/linux/mmzone.h:7, from include/linux/gfp.h:5, from include/linux/slab.h:14, from drivers/scsi/stex.c:20: drivers/scsi/stex.c: In function 'stex_handshake': >> arch/x86/include/asm/string_32.h:325:29: warning: 'scratch' may be used uninitialized in this function [-Wmaybe-uninitialized] #define memset(s, c, count) __builtin_memset(s, c, count) ^~~~~~~~~~~~~~~~ drivers/scsi/stex.c:1111:10: note: 'scratch' was declared here __le32 *scratch; ^~~~~~~ vim +/scratch +325 arch/x86/include/asm/string_32.h ^1da177e include/asm-i386/string.h Linus Torvalds 2005-04-16 309 ^1da177e include/asm-i386/string.h Linus Torvalds 2005-04-16 310 #undef COMMON ^1da177e include/asm-i386/string.h Linus Torvalds 2005-04-16 311 } ^1da177e include/asm-i386/string.h Linus Torvalds 2005-04-16 312 ^1da177e include/asm-i386/string.h Linus Torvalds 2005-04-16 313 #define __constant_c_x_memset(s, c, count) \ 78d64fc2 include/asm-x86/string_32.h Joe Perches 2008-05-12 314 (__builtin_constant_p(count) \ 78d64fc2 include/asm-x86/string_32.h Joe Perches 2008-05-12 315 ? __constant_c_and_count_memset((s), (c), (count)) \ 78d64fc2 include/asm-x86/string_32.h Joe Perches 2008-05-12 316 : __constant_c_memset((s), (c), (count))) ^1da177e include/asm-i386/string.h Linus Torvalds 2005-04-16 317 ^1da177e include/asm-i386/string.h Linus Torvalds 2005-04-16 318 #define __memset(s, c, count) \ 78d64fc2 include/asm-x86/string_32.h Joe Perches 2008-05-12 319 (__builtin_constant_p(count) \ 78d64fc2 include/asm-x86/string_32.h Joe Perches 2008-05-12 320 ? __constant_count_memset((s), (c), (count)) \ 78d64fc2 include/asm-x86/string_32.h Joe Perches 2008-05-12 321 : __memset_generic((s), (c), (count))) ^1da177e include/asm-i386/string.h Linus Torvalds 2005-04-16 322 ^1da177e include/asm-i386/string.h Linus Torvalds 2005-04-16 323 #define __HAVE_ARCH_MEMSET ff60fab7 arch/x86/include/asm/string_32.h Arjan van de Ven 2009-09-28 324 #if (__GNUC__ >= 4) ff60fab7 arch/x86/include/asm/string_32.h Arjan van de Ven 2009-09-28 @325 #define memset(s, c, count) __builtin_memset(s, c, count) ff60fab7 arch/x86/include/asm/string_32.h Arjan van de Ven 2009-09-28 326 #else ^1da177e include/asm-i386/string.h Linus Torvalds 2005-04-16 327 #define memset(s, c, count) \ 78d64fc2 include/asm-x86/string_32.h Joe Perches 2008-05-12 328 (__builtin_constant_p(c) \ 78d64fc2 include/asm-x86/string_32.h Joe Perches 2008-05-12 329 ? __constant_c_x_memset((s), (0x01010101UL * (unsigned char)(c)), \ 78d64fc2 include/asm-x86/string_32.h Joe Perches 2008-05-12 330 (count)) \ 78d64fc2 include/asm-x86/string_32.h Joe Perches 2008-05-12 331 : __memset((s), (c), (count))) ff60fab7 arch/x86/include/asm/string_32.h Arjan van de Ven 2009-09-28 332 #endif ^1da177e include/asm-i386/string.h Linus Torvalds 2005-04-16 333 :::::: The code at line 325 was first introduced by commit :::::: ff60fab71bb3b4fdbf8caf57ff3739ffd0887396 x86: Use __builtin_memset and __builtin_memcpy for memset/memcpy :::::: TO: Arjan van de Ven <arjan@xxxxxxxxxxxxx> :::::: CC: H. Peter Anvin <hpa@xxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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