diff options
| author |   Anton Blanchard <anton@samba.org> | 2012-06-27 13:13:52 +0000 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-06-29 14:35:37 +1000 |
| commit | 0b17ba7258db83cd02da560884e053b85de371f2 (patch) | |
| tree | 970b6d210323d31f037c8593fd325636ec40a843 /arch/powerpc/platforms/pseries/processor_idle.c | |
| parent | powerpc/ftrace: Do not trace restore_interrupts() (diff) | |
| download | linux-dev-0b17ba7258db83cd02da560884e053b85de371f2.tar.xz linux-dev-0b17ba7258db83cd02da560884e053b85de371f2.zip | |
powerpc: check_and_cede_processor() never cedes
Commit f948501b36c6 ("Make hard_irq_disable() actually hard-disable
interrupts") caused check_and_cede_processor to stop working.
->irq_happened will never be zero right after a hard_irq_disable
so the compiler removes the call to cede_processor completely.
The bug was introduced back in the lazy interrupt handling rework
of 3.4 but was hidden until recently because hard_irq_disable did
nothing.
This issue will eventually appear in 3.4 stable since the
hard_irq_disable fix is marked stable, so mark this one for stable
too.
Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: stable@vger.kernel.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/platforms/pseries/processor_idle.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/processor_idle.c b/arch/powerpc/platforms/pseries/processor_idle.c index 41a34bc4a9a2..e61483e8e960 100644 --- a/arch/powerpc/platforms/pseries/processor_idle.c +++ b/arch/powerpc/platforms/pseries/processor_idle.c @@ -106,7 +106,7 @@ static void check_and_cede_processor(void) * we first hard disable then check. */ hard_irq_disable(); - if (get_paca()->irq_happened == 0) + if (!lazy_irq_pending()) cede_processor(); } |