diff options
| author |   Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> | 2006-12-07 02:14:13 +0100 |
|---|---|---|
| committer |   Andi Kleen <andi@basil.nowhere.org> | 2006-12-07 02:14:13 +0100 |
| commit | d331e739f5ad2aaa9d8553891ba6ca823bdbce37 (patch) | |
| tree | 5da7042a022dd119c9b920ceb4101e7203bccb44 /include/asm-x86_64/processor.h | |
| parent | [PATCH] x86-64: Remove unwind stack pointer alignment forcing again (diff) | |
| download | linux-dev-d331e739f5ad2aaa9d8553891ba6ca823bdbce37.tar.xz linux-dev-d331e739f5ad2aaa9d8553891ba6ca823bdbce37.zip | |
[PATCH] x86-64: Fix interrupt race in idle callback (3rd try)
Idle callbacks has some races when enter_idle() sets isidle and subsequent
interrupts that can happen on that CPU, before CPU goes to idle. Due to this,
an IDLE_END can get called before IDLE_START. To avoid these races, disable
interrupts before enter_idle and make sure that all idle routines do not
enable interrupts before entering idle.
Note that poll_idle() still has a this race as it has to enable interrupts
before going to idle. But, all other idle routines have the race fixed.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/asm-x86_64/processor.h')
| -rw-r--r-- | include/asm-x86_64/processor.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/asm-x86_64/processor.h b/include/asm-x86_64/processor.h index cef17e0f828c..76552d72804c 100644 --- a/include/asm-x86_64/processor.h +++ b/include/asm-x86_64/processor.h @@ -475,6 +475,14 @@ static inline void __mwait(unsigned long eax, unsigned long ecx) : :"a" (eax), "c" (ecx)); } +static inline void __sti_mwait(unsigned long eax, unsigned long ecx) +{ + /* "mwait %eax,%ecx;" */ + asm volatile( + "sti; .byte 0x0f,0x01,0xc9;" + : :"a" (eax), "c" (ecx)); +} + extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx); #define stack_current() \ |