tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git test head: 685a26bc60076305987bf06cfd1269e5e4094c73 commit: 685a26bc60076305987bf06cfd1269e5e4094c73 [69/69] rcu/nocb: Avoid ->nocb_lock capture by corresponding CPU config: x86_64-randconfig-x009-201921 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: git checkout 685a26bc60076305987bf06cfd1269e5e4094c73 # save the attached .config to linux build tree make ARCH=x86_64
If you fix the issue, kindly add following tag Reported-by: kbuild test robot <[email protected]> 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:16:0, from arch/x86/include/asm/processor.h:33, from arch/x86/include/asm/cpufeature.h:5, from arch/x86/include/asm/thread_info.h:53, from include/linux/thread_info.h:38, from arch/x86/include/asm/preempt.h:7, from include/linux/preempt.h:78, from include/linux/spinlock.h:51, from kernel/rcu/tree.c:23: kernel/rcu/tree_plugin.h: In function 'rcu_nocb_gp_kthread': >> arch/x86/include/asm/irqflags.h:41:2: warning: 'flags' may be used >> uninitialized in this function [-Wmaybe-uninitialized] asm volatile("push %0 ; popf" ^~~ In file included from kernel/rcu/tree.c:3519:0: kernel/rcu/tree_plugin.h:1719:16: note: 'flags' was declared here unsigned long flags; ^~~~~ kernel/rcu/tree_plugin.h: In function 'do_nocb_deferred_wakeup_common': kernel/rcu/tree_plugin.h:1891:2: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized] wake_nocb_gp(rdp, ndw == RCU_NOCB_WAKE_FORCE, flags); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- In file included from include/linux/irqflags.h:16:0, from arch/x86/include/asm/processor.h:33, from arch/x86/include/asm/cpufeature.h:5, from arch/x86/include/asm/thread_info.h:53, from include/linux/thread_info.h:38, from arch/x86/include/asm/preempt.h:7, from include/linux/preempt.h:78, from include/linux/spinlock.h:51, from kernel//rcu/tree.c:23: kernel//rcu/tree_plugin.h: In function 'rcu_nocb_gp_kthread': >> arch/x86/include/asm/irqflags.h:41:2: warning: 'flags' may be used >> uninitialized in this function [-Wmaybe-uninitialized] asm volatile("push %0 ; popf" ^~~ In file included from kernel//rcu/tree.c:3519:0: kernel//rcu/tree_plugin.h:1719:16: note: 'flags' was declared here unsigned long flags; ^~~~~ kernel//rcu/tree_plugin.h: In function 'do_nocb_deferred_wakeup_common': kernel//rcu/tree_plugin.h:1891:2: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized] wake_nocb_gp(rdp, ndw == RCU_NOCB_WAKE_FORCE, flags); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/flags +41 arch/x86/include/asm/irqflags.h 6abcd98f include/asm-x86/irqflags.h Glauber de Oliveira Costa 2008-01-30 37 1f59a458 arch/x86/include/asm/irqflags.h Nick Desaulniers 2018-08-27 38 extern inline void native_restore_fl(unsigned long flags); 1f59a458 arch/x86/include/asm/irqflags.h Nick Desaulniers 2018-08-27 39 extern inline void native_restore_fl(unsigned long flags) 6abcd98f include/asm-x86/irqflags.h Glauber de Oliveira Costa 2008-01-30 40 { cf7f7191 include/asm-x86/irqflags.h Joe Perches 2008-03-23 @41 asm volatile("push %0 ; popf" 6abcd98f include/asm-x86/irqflags.h Glauber de Oliveira Costa 2008-01-30 42 : /* no output */ 6abcd98f include/asm-x86/irqflags.h Glauber de Oliveira Costa 2008-01-30 43 :"g" (flags) cf7f7191 include/asm-x86/irqflags.h Joe Perches 2008-03-23 44 :"memory", "cc"); 6abcd98f include/asm-x86/irqflags.h Glauber de Oliveira Costa 2008-01-30 45 } 6abcd98f include/asm-x86/irqflags.h Glauber de Oliveira Costa 2008-01-30 46 :::::: The code at line 41 was first introduced by commit :::::: cf7f7191cf20011e47243b594e433275a6db811b include/asm-x86/irqflags.h: checkpatch cleanups - formatting only :::::: TO: Joe Perches <[email protected]> :::::: CC: Ingo Molnar <[email protected]> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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