tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git test head: 77ef1b88654653681661fb0ce7cc1d6e712a409f commit: 6ad9e6bcf543a758d4b7323cb2909ebd66f39ee4 [70/72] fixup! rcu/nocb: Avoid ->nocb_lock capture by corresponding CPU config: alpha-allmodconfig (attached as .config) compiler: alpha-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 6ad9e6bcf543a758d4b7323cb2909ebd66f39ee4 # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=alpha
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 arch/alpha/include/asm/bug.h:8:0, from include/linux/bug.h:5, from include/linux/thread_info.h:12, from include/asm-generic/preempt.h:5, from ./arch/alpha/include/generated/asm/preempt.h:1, 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 'do_nocb_deferred_wakeup_common': >> arch/alpha/include/asm/pal.h:57:17: warning: 'flags' may be used >> uninitialized in this function [-Wmaybe-uninitialized] register TYPE0 __r16 __asm__("$16") = arg0; \ ^~~~~ In file included from kernel/rcu/tree.c:3519:0: kernel/rcu/tree_plugin.h:1883:16: note: 'flags' was declared here unsigned long flags; ^~~~~ In file included from arch/alpha/include/asm/bug.h:8:0, from include/linux/bug.h:5, from include/linux/thread_info.h:12, from include/asm-generic/preempt.h:5, from ./arch/alpha/include/generated/asm/preempt.h:1, 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/alpha/include/asm/pal.h:57:17: warning: 'flags' may be used >> uninitialized in this function [-Wmaybe-uninitialized] register TYPE0 __r16 __asm__("$16") = arg0; \ ^~~~~ In file included from kernel/rcu/tree.c:3519:0: kernel/rcu/tree_plugin.h:1721:16: note: 'flags' was declared here unsigned long flags; ^~~~~ -- In file included from arch/alpha/include/asm/bug.h:8:0, from include/linux/bug.h:5, from include/linux/thread_info.h:12, from include/asm-generic/preempt.h:5, from ./arch/alpha/include/generated/asm/preempt.h:1, 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 'do_nocb_deferred_wakeup_common': >> arch/alpha/include/asm/pal.h:57:17: warning: 'flags' may be used >> uninitialized in this function [-Wmaybe-uninitialized] register TYPE0 __r16 __asm__("$16") = arg0; \ ^~~~~ In file included from kernel//rcu/tree.c:3519:0: kernel//rcu/tree_plugin.h:1883:16: note: 'flags' was declared here unsigned long flags; ^~~~~ In file included from arch/alpha/include/asm/bug.h:8:0, from include/linux/bug.h:5, from include/linux/thread_info.h:12, from include/asm-generic/preempt.h:5, from ./arch/alpha/include/generated/asm/preempt.h:1, 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/alpha/include/asm/pal.h:57:17: warning: 'flags' may be used >> uninitialized in this function [-Wmaybe-uninitialized] register TYPE0 __r16 __asm__("$16") = arg0; \ ^~~~~ In file included from kernel//rcu/tree.c:3519:0: kernel//rcu/tree_plugin.h:1721:16: note: 'flags' was declared here unsigned long flags; ^~~~~ vim +/flags +57 arch/alpha/include/asm/pal.h ec221208 David Howells 2012-03-28 52 ec221208 David Howells 2012-03-28 53 #define __CALL_PAL_RW1(NAME, RTYPE, TYPE0) \ ec221208 David Howells 2012-03-28 54 extern inline RTYPE NAME(TYPE0 arg0) \ ec221208 David Howells 2012-03-28 55 { \ ec221208 David Howells 2012-03-28 56 register RTYPE __r0 __asm__("$0"); \ ec221208 David Howells 2012-03-28 @57 register TYPE0 __r16 __asm__("$16") = arg0; \ ec221208 David Howells 2012-03-28 58 __asm__ __volatile__( \ ec221208 David Howells 2012-03-28 59 "call_pal %2 # "#NAME \ ec221208 David Howells 2012-03-28 60 : "=r"(__r16), "=r"(__r0) \ ec221208 David Howells 2012-03-28 61 : "i"(PAL_ ## NAME), "0"(__r16) \ ec221208 David Howells 2012-03-28 62 : "$1", "$22", "$23", "$24", "$25"); \ ec221208 David Howells 2012-03-28 63 return __r0; \ ec221208 David Howells 2012-03-28 64 } ec221208 David Howells 2012-03-28 65 :::::: The code at line 57 was first introduced by commit :::::: ec2212088c42ff7d1362629ec26dda4f3e8bdad3 Disintegrate asm/system.h for Alpha :::::: TO: David Howells <[email protected]> :::::: CC: David Howells <[email protected]> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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