diff options
| author | Ingo Molnar <mingo@kernel.org> | 2012-04-14 13:18:27 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-04-14 13:19:04 +0200 |
| commit | 6ac1ef482d7ae0c690f1640bf6eb818ff9a2d91e (patch) | |
| tree | 021cc9f6b477146fcebe6f3be4752abfa2ba18a9 /arch/powerpc/platforms/pseries/processor_idle.c | |
| parent | 682968e0c425c60f0dde37977e5beb2b12ddc4cc (diff) | |
| parent | a385ec4f11bdcf81af094c03e2444ee9b7fad2e5 (diff) | |
Merge branch 'perf/core' into perf/uprobes
Merge in latest upstream (and the latest perf development tree),
to prepare for tooling changes, and also to pick up v3.4 MM
changes that the uprobes code needs to take care of.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/processor_idle.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/processor_idle.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/arch/powerpc/platforms/pseries/processor_idle.c b/arch/powerpc/platforms/pseries/processor_idle.c index 085fd3f45ad..41a34bc4a9a 100644 --- a/arch/powerpc/platforms/pseries/processor_idle.c +++ b/arch/powerpc/platforms/pseries/processor_idle.c @@ -14,9 +14,9 @@ #include <asm/paca.h> #include <asm/reg.h> -#include <asm/system.h> #include <asm/machdep.h> #include <asm/firmware.h> +#include <asm/runlatch.h> #include "plpar_wrappers.h" #include "pseries.h" @@ -96,6 +96,20 @@ out: return index; } +static void check_and_cede_processor(void) +{ + /* + * Interrupts are soft-disabled at this point, + * but not hard disabled. So an interrupt might have + * occurred before entering NAP, and would be potentially + * lost (edge events, decrementer events, etc...) unless + * we first hard disable then check. + */ + hard_irq_disable(); + if (get_paca()->irq_happened == 0) + cede_processor(); +} + static int dedicated_cede_loop(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index) @@ -108,7 +122,7 @@ static int dedicated_cede_loop(struct cpuidle_device *dev, ppc64_runlatch_off(); HMT_medium(); - cede_processor(); + check_and_cede_processor(); get_lppaca()->donate_dedicated_cpu = 0; dev->last_residency = @@ -132,7 +146,7 @@ static int shared_cede_loop(struct cpuidle_device *dev, * processor. When returning here, external interrupts * are enabled. */ - cede_processor(); + check_and_cede_processor(); dev->last_residency = (int)idle_loop_epilog(in_purr, kt_before); |