diff options
| -rw-r--r-- | arch/x86/include/asm/cpu.h | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/process.c | 3 | ||||
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 3 |
3 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h index 4fab24de26b..6e6e7558e70 100644 --- a/arch/x86/include/asm/cpu.h +++ b/arch/x86/include/asm/cpu.h @@ -32,5 +32,6 @@ extern void arch_unregister_cpu(int); DECLARE_PER_CPU(int, cpu_state); +int __cpuinit mwait_usable(const struct cpuinfo_x86 *); #endif /* _ASM_X86_CPU_H */ diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index d8286ed54ff..e764fc05d70 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -14,6 +14,7 @@ #include <linux/utsname.h> #include <trace/events/power.h> #include <linux/hw_breakpoint.h> +#include <asm/cpu.h> #include <asm/system.h> #include <asm/apic.h> #include <asm/syscalls.h> @@ -505,7 +506,7 @@ static void poll_idle(void) #define MWAIT_ECX_EXTENDED_INFO 0x01 #define MWAIT_EDX_C1 0xf0 -static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c) +int __cpuinit mwait_usable(const struct cpuinfo_x86 *c) { u32 eax, ebx, ecx, edx; diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 763df77343d..0cbe8c0b35e 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1402,8 +1402,9 @@ static inline void mwait_play_dead(void) unsigned int highest_subcstate = 0; int i; void *mwait_ptr; + struct cpuinfo_x86 *c = __this_cpu_ptr(&cpu_info); - if (!cpu_has(__this_cpu_ptr(&cpu_info), X86_FEATURE_MWAIT)) + if (!(cpu_has(c, X86_FEATURE_MWAIT) && mwait_usable(c))) return; if (!cpu_has(__this_cpu_ptr(&cpu_info), X86_FEATURE_CLFLSH)) return; |