diff options
author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-04-05 11:23:39 -0400 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2011-04-14 02:52:32 -0400 |
commit | 184748cc50b2dceb8287f9fb657eda48ff8fcfe7 (patch) | |
tree | da32494cf29e5ec9f80b17dc8590bdc450ea545a /arch/powerpc/kernel | |
parent | a4c98f8bbeafee12c979c90743f6fda94f7515c7 (diff) |
sched: Provide scheduler_ipi() callback in response to smp_send_reschedule()
For future rework of try_to_wake_up() we'd like to push part of that
function onto the CPU the task is actually going to run on.
In order to do so we need a generic callback from the existing scheduler IPI.
This patch introduces such a generic callback: scheduler_ipi() and
implements it as a NOP.
BenH notes: PowerPC might use this IPI on offline CPUs under rare conditions!
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Reviewed-by: Frank Rowand <frank.rowand@am.sony.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110405152728.744338123@chello.nl
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r-- | arch/powerpc/kernel/smp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index cbdbb14be4b0..9f9c204bef69 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c | |||
@@ -116,7 +116,7 @@ void smp_message_recv(int msg) | |||
116 | generic_smp_call_function_interrupt(); | 116 | generic_smp_call_function_interrupt(); |
117 | break; | 117 | break; |
118 | case PPC_MSG_RESCHEDULE: | 118 | case PPC_MSG_RESCHEDULE: |
119 | /* we notice need_resched on exit */ | 119 | scheduler_ipi(); |
120 | break; | 120 | break; |
121 | case PPC_MSG_CALL_FUNC_SINGLE: | 121 | case PPC_MSG_CALL_FUNC_SINGLE: |
122 | generic_smp_call_function_single_interrupt(); | 122 | generic_smp_call_function_single_interrupt(); |
@@ -146,7 +146,7 @@ static irqreturn_t call_function_action(int irq, void *data) | |||
146 | 146 | ||
147 | static irqreturn_t reschedule_action(int irq, void *data) | 147 | static irqreturn_t reschedule_action(int irq, void *data) |
148 | { | 148 | { |
149 | /* we just need the return path side effect of checking need_resched */ | 149 | scheduler_ipi(); |
150 | return IRQ_HANDLED; | 150 | return IRQ_HANDLED; |
151 | } | 151 | } |
152 | 152 | ||