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Date: Thu, 4 May 2017 04:53:22 +0800
From: kbuild test robot <lkp@...el.com>
To: Gavin Shan <gwshan@...ux.vnet.ibm.com>
Cc: kbuild-all@...org, netdev@...r.kernel.org, joe@...ches.com,
kubakici@...pl, f.fainelli@...il.com, davem@...emloft.net,
Gavin Shan <gwshan@...ux.vnet.ibm.com>
Subject: Re: [PATCH v4 net-next 05/10] net/ncsi: Ethtool operation to get
NCSI channel info
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 <torvalds@...970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@...970.osdl.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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