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| author | Boris Ostrovsky <boris.ostrovsky@amd.com> | 2012-03-13 19:55:09 +0100 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2012-03-30 03:23:01 -0400 |
| commit | 1a022e3f1be11730bd8747b1af96a0274bf6356e (patch) | |
| tree | d3c95b68626ac7d963ac3a85a07dae1cfc011906 /arch | |
| parent | e07510585a88c0f6c6c728e2e006aa913496d4ae (diff) | |
| download | blackbird-op-linux-1a022e3f1be11730bd8747b1af96a0274bf6356e.tar.gz blackbird-op-linux-1a022e3f1be11730bd8747b1af96a0274bf6356e.zip | |
idle, x86: Allow off-lined CPU to enter deeper C states
Currently when a CPU is off-lined it enters either MWAIT-based idle or,
if MWAIT is not desired or supported, HLT-based idle (which places the
processor in C1 state). This patch allows processors without MWAIT
support to stay in states deeper than C1.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@amd.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 66d250c00d11..93a2a0932b51 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -50,6 +50,7 @@ #include <linux/tboot.h> #include <linux/stackprotector.h> #include <linux/gfp.h> +#include <linux/cpuidle.h> #include <asm/acpi.h> #include <asm/desc.h> @@ -1422,7 +1423,8 @@ void native_play_dead(void) tboot_shutdown(TB_SHUTDOWN_WFS); mwait_play_dead(); /* Only returns on failure */ - hlt_play_dead(); + if (cpuidle_play_dead()) + hlt_play_dead(); } #else /* ... !CONFIG_HOTPLUG_CPU */ |
