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Message-ID: <201606141545.CzlUq7Oo%fengguang.wu@intel.com>
Date: Tue, 14 Jun 2016 15:25:18 +0800
From: kbuild test robot <lkp@...el.com>
To: Charles Chiou <ch1102chiou@...il.com>
Cc: kbuild-all@...org, jejb@...ux.vnet.ibm.com,
martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
linux-kernel@...r.kernel.org, linus.chen@...promise.com,
grace.chang@...promise.com, victor.p@...mise.com,
eva.cheng@...promise.com, charles.chiou@...promise.com,
julian.calaby@...il.com, Paul <paul.lyu@...promise.com>
Subject: Re: [v2 PATCH 1/2] scsi:stex.c Support Pegasus 3 product
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@...radead.org>
:::::: CC: H. Peter Anvin <hpa@...or.com>
---
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