Hi Stanislaw, [auto build test WARNING on net-next/master] [also build test WARNING on v4.10-rc6 next-20170202] [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/Stanislaw-Gruszka/ethtool-do-not-vzalloc-0-on-registers-dump/20170202-194352 config: cris-etrax-100lx_v2_defconfig (attached as .config) compiler: cris-linux-gcc (GCC) 6.2.0 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 # save the attached .config to linux build tree make.cross ARCH=cris 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 >>): net/core/ethtool.c: In function 'ethtool_get_feature_mask': net/core/ethtool.c:311:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ In file included from include/linux/uaccess.h:5:0, from include/net/checksum.h:25, from include/linux/skbuff.h:31, from include/linux/if_ether.h:23, from include/uapi/linux/ethtool.h:18, from include/linux/ethtool.h:17, from net/core/ethtool.c:18: net/core/ethtool.c: In function 'ethtool_get_regs': >> arch/cris/include/asm/uaccess.h:380:10: warning: 'regbuf' may be used >> uninitialized in this function [-Wmaybe-uninitialized] return __copy_user(to, from, n); ^~~~~~~~~~~~~~~~~~~~~~~~ net/core/ethtool.c:1395:8: note: 'regbuf' was declared here void *regbuf; ^~~~~~ vim +/regbuf +380 arch/cris/include/asm/uaccess.h eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 364 memset(to, 0, n); eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 365 return n; eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 366 } eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 367 if (__builtin_constant_p(n)) eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 368 return __constant_copy_from_user(to, from, n); eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 369 else eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 370 return __copy_user_zeroing(to, from, n); eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 371 } ^1da177e4 include/asm-cris/uaccess.h Linus Torvalds 2005-04-16 372 eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 373 static inline size_t copy_to_user(void __user *to, const void *from, size_t n) eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 374 { eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 375 if (unlikely(!access_ok(VERIFY_WRITE, to, n))) eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 376 return n; eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 377 if (__builtin_constant_p(n)) eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 378 return __constant_copy_to_user(to, from, n); eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 379 else eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 @380 return __copy_user(to, from, n); eb47e0293 arch/cris/include/asm/uaccess.h Al Viro 2016-08-18 381 } ^1da177e4 include/asm-cris/uaccess.h Linus Torvalds 2005-04-16 382 ^1da177e4 include/asm-cris/uaccess.h Linus Torvalds 2005-04-16 383 /* We let the __ versions of copy_from/to_user inline, because they're often ^1da177e4 include/asm-cris/uaccess.h Linus Torvalds 2005-04-16 384 * used in fast paths and have only a small space overhead. ^1da177e4 include/asm-cris/uaccess.h Linus Torvalds 2005-04-16 385 */ ^1da177e4 include/asm-cris/uaccess.h Linus Torvalds 2005-04-16 386 d9b5444ee include/asm-cris/uaccess.h Adrian Bunk 2005-11-07 387 static inline unsigned long 07f2402b4 include/asm-cris/uaccess.h Jesper Nilsson 2008-03-04 388 __generic_copy_from_user_nocheck(void *to, const void __user *from, :::::: The code at line 380 was first introduced by commit :::::: eb47e0293baaa3044022059f1fa9ff474bfe35cb cris: buggered copy_from_user/copy_to_user/clear_user :::::: TO: Al Viro <[email protected]> :::::: CC: Al Viro <[email protected]> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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