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| author | Tiejun Chen <tiejun.chen@windriver.com> | 2013-01-15 17:01:19 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-01-29 10:18:16 +1100 |
| commit | 689dfa894c57842a05bf6dc9f97e6bb71ec5f386 (patch) | |
| tree | 36b1b888f77c68447b57d6db37cafe3032874f31 | |
| parent | fefd9e6f8860249b2c284d89cb2e51fa71a9503a (diff) | |
| download | linux-689dfa894c57842a05bf6dc9f97e6bb71ec5f386.tar.gz | |
powerpc: Max next_tb to prevent from replaying timer interrupt
With lazy interrupt, we always call __check_irq_replaysome with decrementers_next_tb to check if we need to replay timer interrupt. So in hotplug case we also need to set decrementers_next_tb as MAX to make sure __check_irq_replay don't replay timer interrupt when return as we expect, otherwise we'll trap here infinitely. Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| -rw-r--r-- | arch/powerpc/kernel/time.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 6f6b1cccc916..127361e093f4 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -494,10 +494,15 @@ void timer_interrupt(struct pt_regs * regs) set_dec(DECREMENTER_MAX); /* Some implementations of hotplug will get timer interrupts while - * offline, just ignore these + * offline, just ignore these and we also need to set + * decrementers_next_tb as MAX to make sure __check_irq_replay + * don't replay timer interrupt when return, otherwise we'll trap + * here infinitely :( */ - if (!cpu_online(smp_processor_id())) + if (!cpu_online(smp_processor_id())) { + *next_tb = ~(u64)0; return; + } /* Conditionally hard-enable interrupts now that the DEC has been * bumped to its maximum value |