diff options
| -rw-r--r-- | arch/x86/include/asm/cpu.h | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/process.c | 5 | ||||
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 3 |
3 files changed, 6 insertions, 3 deletions
diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h index 4fab24de26b..4564c8e28a3 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 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 2502aafeeb3..12d4bf11b41 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> @@ -509,13 +510,13 @@ static void poll_idle(void) * * idle=mwait overrides this decision and forces the usage of mwait. */ -static int __cpuinitdata force_mwait; +static int force_mwait; #define MWAIT_INFO 0x05 #define MWAIT_ECX_EXTENDED_INFO 0x01 #define MWAIT_EDX_C1 0xf0 -static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c) +int 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 083e99d1b7d..d8fd571d57b 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1396,8 +1396,9 @@ static inline void mwait_play_dead(void) unsigned int highest_subcstate = 0; int i; void *mwait_ptr; + struct cpuinfo_x86 *c = ¤t_cpu_data; - if (!cpu_has(¤t_cpu_data, X86_FEATURE_MWAIT)) + if (!(cpu_has(c, X86_FEATURE_MWAIT) && mwait_usable(c))) return; if (!cpu_has(¤t_cpu_data, X86_FEATURE_CLFLSH)) return; |