tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.sched/core head: b7c6a9d358c54f2d57d3df384d42083817e05028 commit: b7c6a9d358c54f2d57d3df384d42083817e05028 [11/11] sched/wait: Introduce new, more compact wait_event*() primitives config: m68k-allmodconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 4.9.0 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 git checkout b7c6a9d358c54f2d57d3df384d42083817e05028 # save the attached .config to linux build tree make.cross ARCH=m68k
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/bitops.h:36:0, from include/linux/kernel.h:10, from include/linux/list.h:8, from include/linux/async.h:16, from drivers/scsi/ufs/ufshcd.c:40: drivers/scsi/ufs/ufshcd.c: In function 'ufshcd_exec_dev_cmd': >> arch/m68k/include/asm/bitops.h:54:13: warning: 'tag' may be used >> uninitialized in this function [-Wmaybe-uninitialized] : "d" (nr ^ 31), "o" (*vaddr) ^ drivers/scsi/ufs/ufshcd.c:2589:6: note: 'tag' was declared here int tag; ^ drivers/scsi/ufs/ufshcd.c: In function 'ufshcd_issue_tm_cmd': drivers/scsi/ufs/ufshcd.c:5438:7: warning: 'free_slot' may be used uninitialized in this function [-Wmaybe-uninitialized] if (ufshcd_clear_tm_cmd(hba, free_slot)) ^ vim +/tag +54 arch/m68k/include/asm/bitops.h 171d809d Greg Ungerer 2011-05-17 38 : "memory"); 171d809d Greg Ungerer 2011-05-17 39 } 171d809d Greg Ungerer 2011-05-17 40 171d809d Greg Ungerer 2011-05-17 41 static inline void bset_mem_set_bit(int nr, volatile unsigned long *vaddr) 171d809d Greg Ungerer 2011-05-17 42 { 171d809d Greg Ungerer 2011-05-17 43 char *p = (char *)vaddr + (nr ^ 31) / 8; 171d809d Greg Ungerer 2011-05-17 44 171d809d Greg Ungerer 2011-05-17 45 __asm__ __volatile__ ("bset %1,%0" 171d809d Greg Ungerer 2011-05-17 46 : "+m" (*p) 171d809d Greg Ungerer 2011-05-17 47 : "di" (nr & 7)); 171d809d Greg Ungerer 2011-05-17 48 } 171d809d Greg Ungerer 2011-05-17 49 171d809d Greg Ungerer 2011-05-17 50 static inline void bfset_mem_set_bit(int nr, volatile unsigned long *vaddr) 171d809d Greg Ungerer 2011-05-17 51 { 171d809d Greg Ungerer 2011-05-17 52 __asm__ __volatile__ ("bfset %1{%0:#1}" 171d809d Greg Ungerer 2011-05-17 53 : 171d809d Greg Ungerer 2011-05-17 @54 : "d" (nr ^ 31), "o" (*vaddr) 171d809d Greg Ungerer 2011-05-17 55 : "memory"); 171d809d Greg Ungerer 2011-05-17 56 } 171d809d Greg Ungerer 2011-05-17 57 171d809d Greg Ungerer 2011-05-17 58 #if defined(CONFIG_COLDFIRE) 171d809d Greg Ungerer 2011-05-17 59 #define set_bit(nr, vaddr) bset_reg_set_bit(nr, vaddr) 171d809d Greg Ungerer 2011-05-17 60 #elif defined(CONFIG_CPU_HAS_NO_BITFIELDS) 171d809d Greg Ungerer 2011-05-17 61 #define set_bit(nr, vaddr) bset_mem_set_bit(nr, vaddr) 171d809d Greg Ungerer 2011-05-17 62 #else :::::: The code at line 54 was first introduced by commit :::::: 171d809df1896c1022f9778cd2788be6c255a7dc m68k: merge mmu and non-mmu bitops.h :::::: TO: Greg Ungerer <g...@uclinux.org> :::::: CC: Greg Ungerer <g...@uclinux.org> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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