Hi Hidehiro, [auto build test results on v4.3-rc2 -- if it's inappropriate base, please ignore]
config: ia64-allyesconfig (attached as .config) 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 0077681103150af584e5e592c0238fd010654c26 # save the attached .config to linux build tree make.cross ARCH=ia64 All warnings (new ones prefixed by >>): In file included from arch/ia64/include/uapi/asm/intrinsics.h:21:0, from arch/ia64/include/asm/intrinsics.h:10, from arch/ia64/include/asm/bitops.h:18, from include/linux/bitops.h:36, from include/linux/kernel.h:10, from include/linux/list.h:8, from include/linux/preempt.h:10, from include/linux/spinlock.h:50, from include/linux/mmzone.h:7, from include/linux/gfp.h:5, from include/linux/mm.h:9, from kernel/kexec_core.c:12: kernel/kexec_core.c: In function 'crash_kexec': arch/ia64/include/uapi/asm/cmpxchg.h:56:2: warning: value computed is not used [-Wunused-value] ((__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr)))) ^ arch/ia64/include/asm/atomic.h:135:30: note: in expansion of macro 'xchg' #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) ^ >> kernel/kexec_core.c:899:3: note: in expansion of macro 'atomic_xchg' atomic_xchg(&panic_cpu, -1); ^ vim +/atomic_xchg +899 kernel/kexec_core.c 883 884 /* 885 * Only one CPU is allowed to execute the crash_kexec() code as with 886 * panic(). Otherwise parallel calls of panic() and crash_kexec() 887 * may stop each other. To exclude them, we use panic_cpu here too. 888 */ 889 this_cpu = raw_smp_processor_id(); 890 old_cpu = atomic_cmpxchg(&panic_cpu, -1, this_cpu); 891 if (old_cpu == -1) { 892 /* This is the 1st CPU which comes here, so go ahead. */ 893 __crash_kexec(regs); 894 895 /* 896 * Reset panic_cpu to allow another panic()/crash_kexec() 897 * call. 898 */ > 899 atomic_xchg(&panic_cpu, -1); 900 } 901 } 902 903 size_t crash_get_memory_size(void) 904 { 905 size_t size = 0; 906 907 mutex_lock(&kexec_mutex); --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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