Hi Joe, [auto build test WARNING on jikos-livepatching/for-next] [also build test WARNING on v4.12-rc7 next-20170630] [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/Joe-Lawrence/livepatch-introduce-shadow-variable-API/20170630-061942 base: https://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching.git for-next config: s390-performance_defconfig (attached as .config) compiler: s390x-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=s390 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/irqflags.h:15:0, from arch/s390/include/asm/processor.h:35, from arch/s390/include/asm/thread_info.h:24, from include/linux/thread_info.h:37, from arch/s390/include/asm/preempt.h:5, from include/linux/preempt.h:80, from include/linux/spinlock.h:50, from include/linux/rcupdate.h:38, from include/linux/rculist.h:10, from include/linux/hashtable.h:13, from kernel/livepatch/shadow.c:49: kernel/livepatch/shadow.c: In function '_klp_shadow_attach': >> arch/s390/include/asm/irqflags.h:63:12: warning: 'flags' may be used >> uninitialized in this function [-Wmaybe-uninitialized] if (flags & ARCH_IRQ_ENABLED) ^ kernel/livepatch/shadow.c:135:16: note: 'flags' was declared here unsigned long flags; ^~~~~ -- In file included from include/linux/irqflags.h:15:0, from arch/s390/include/asm/processor.h:35, from arch/s390/include/asm/thread_info.h:24, from include/linux/thread_info.h:37, from arch/s390/include/asm/preempt.h:5, from include/linux/preempt.h:80, from include/linux/spinlock.h:50, from include/linux/rcupdate.h:38, from include/linux/rculist.h:10, from include/linux/hashtable.h:13, from kernel//livepatch/shadow.c:49: kernel//livepatch/shadow.c: In function '_klp_shadow_attach': >> arch/s390/include/asm/irqflags.h:63:12: warning: 'flags' may be used >> uninitialized in this function [-Wmaybe-uninitialized] if (flags & ARCH_IRQ_ENABLED) ^ kernel//livepatch/shadow.c:135:16: note: 'flags' was declared here unsigned long flags; ^~~~~ vim +/flags +63 arch/s390/include/asm/irqflags.h 94c12cc7d include/asm-s390/irqflags.h Martin Schwidefsky 2006-09-28 47 } 94c12cc7d include/asm-s390/irqflags.h Martin Schwidefsky 2006-09-28 48 f433c4aec arch/s390/include/asm/irqflags.h Steven Rostedt 2011-07-24 49 static inline notrace void arch_local_irq_disable(void) df9ee2927 arch/s390/include/asm/irqflags.h David Howells 2010-10-07 50 { df9ee2927 arch/s390/include/asm/irqflags.h David Howells 2010-10-07 51 arch_local_irq_save(); df9ee2927 arch/s390/include/asm/irqflags.h David Howells 2010-10-07 52 } 1f194a4c3 include/asm-s390/irqflags.h Heiko Carstens 2006-07-03 53 f433c4aec arch/s390/include/asm/irqflags.h Steven Rostedt 2011-07-24 54 static inline notrace void arch_local_irq_enable(void) 94c12cc7d include/asm-s390/irqflags.h Martin Schwidefsky 2006-09-28 55 { df9ee2927 arch/s390/include/asm/irqflags.h David Howells 2010-10-07 56 __arch_local_irq_stosm(0x03); 94c12cc7d include/asm-s390/irqflags.h Martin Schwidefsky 2006-09-28 57 } 1f194a4c3 include/asm-s390/irqflags.h Heiko Carstens 2006-07-03 58 204ee2c56 arch/s390/include/asm/irqflags.h Christian Borntraeger 2016-01-11 59 /* This only restores external and I/O interrupt state */ f433c4aec arch/s390/include/asm/irqflags.h Steven Rostedt 2011-07-24 60 static inline notrace void arch_local_irq_restore(unsigned long flags) df9ee2927 arch/s390/include/asm/irqflags.h David Howells 2010-10-07 61 { 204ee2c56 arch/s390/include/asm/irqflags.h Christian Borntraeger 2016-01-11 62 /* only disabled->disabled and disabled->enabled is valid */ 204ee2c56 arch/s390/include/asm/irqflags.h Christian Borntraeger 2016-01-11 @63 if (flags & ARCH_IRQ_ENABLED) 204ee2c56 arch/s390/include/asm/irqflags.h Christian Borntraeger 2016-01-11 64 arch_local_irq_enable(); df9ee2927 arch/s390/include/asm/irqflags.h David Howells 2010-10-07 65 } df9ee2927 arch/s390/include/asm/irqflags.h David Howells 2010-10-07 66 f433c4aec arch/s390/include/asm/irqflags.h Steven Rostedt 2011-07-24 67 static inline notrace bool arch_irqs_disabled_flags(unsigned long flags) 1f194a4c3 include/asm-s390/irqflags.h Heiko Carstens 2006-07-03 68 { 204ee2c56 arch/s390/include/asm/irqflags.h Christian Borntraeger 2016-01-11 69 return !(flags & ARCH_IRQ_ENABLED); 1f194a4c3 include/asm-s390/irqflags.h Heiko Carstens 2006-07-03 70 } 1f194a4c3 include/asm-s390/irqflags.h Heiko Carstens 2006-07-03 71 :::::: The code at line 63 was first introduced by commit :::::: 204ee2c5643199a25181ec04ea645d00709c2a5a s390/irqflags: optimize irq restore :::::: TO: Christian Borntraeger <[email protected]> :::::: CC: Martin Schwidefsky <[email protected]> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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