Hi Markus, [auto build test WARNING on linus/master] [also build test WARNING on v4.10-rc4 next-20170118] [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/SF-Markus-Elfring/alpha-Fine-tuning-for-five-function-implementations/20170119-075247 config: alpha-defconfig (attached as .config) compiler: alpha-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705 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=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 >>): arch/alpha/kernel/srm_env.c: In function 'srm_env_proc_write': >> arch/alpha/kernel/srm_env.c:108:6: warning: 'res' may be used uninitialized >> in this function [-Wmaybe-uninitialized] int res; ^~~ vim +/res +108 arch/alpha/kernel/srm_env.c 0ead0f84 Alexey Dobriyan 2009-12-14 92 seq_write(m, page, ret); 0ead0f84 Alexey Dobriyan 2009-12-14 93 ret = 0; 16b7f4dc Jan-Benedict Glaw 2006-11-07 94 } else 0ead0f84 Alexey Dobriyan 2009-12-14 95 ret = -EFAULT; 0ead0f84 Alexey Dobriyan 2009-12-14 96 free_page((unsigned long)page); 0ead0f84 Alexey Dobriyan 2009-12-14 97 return ret; 0ead0f84 Alexey Dobriyan 2009-12-14 98 } ^1da177e Linus Torvalds 2005-04-16 99 0ead0f84 Alexey Dobriyan 2009-12-14 100 static int srm_env_proc_open(struct inode *inode, struct file *file) 0ead0f84 Alexey Dobriyan 2009-12-14 101 { d9dda78b Al Viro 2013-03-31 102 return single_open(file, srm_env_proc_show, PDE_DATA(inode)); ^1da177e Linus Torvalds 2005-04-16 103 } ^1da177e Linus Torvalds 2005-04-16 104 0ead0f84 Alexey Dobriyan 2009-12-14 105 static ssize_t srm_env_proc_write(struct file *file, const char __user *buffer, 0ead0f84 Alexey Dobriyan 2009-12-14 106 size_t count, loff_t *pos) ^1da177e Linus Torvalds 2005-04-16 107 { ^1da177e Linus Torvalds 2005-04-16 @108 int res; 1c1ec6c6 Al Viro 2013-03-31 109 unsigned long id = (unsigned long)PDE_DATA(file_inode(file)); ^1da177e Linus Torvalds 2005-04-16 110 char *buf = (char *) __get_free_page(GFP_USER); ^1da177e Linus Torvalds 2005-04-16 111 unsigned long ret1, ret2; ^1da177e Linus Torvalds 2005-04-16 112 ^1da177e Linus Torvalds 2005-04-16 113 if (!buf) ^1da177e Linus Torvalds 2005-04-16 114 return -ENOMEM; ^1da177e Linus Torvalds 2005-04-16 115 cb234559 Markus Elfring 2017-01-18 116 if (count >= PAGE_SIZE) { :::::: The code at line 108 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <[email protected]> :::::: CC: Linus Torvalds <[email protected]> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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