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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-19 15:20:58 +0000 |
|---|---|---|
| committer | Terry Lv <r65388@freescale.com> | 2012-07-25 13:11:18 +0800 |
| commit | 3a4b608a1a37da7345667914330c706e3dedffa6 (patch) | |
| tree | ae9bf028394ea08f971bd50d01eb753a140afb41 /arch/arm/kernel | |
| parent | 7f0ba255f32ed609d0b1b7f153577f23311cc3ba (diff) | |
| download | linux-3a4b608a1a37da7345667914330c706e3dedffa6.tar.gz | |
ARM: fix rcu stalls on SMP platforms
commit 7deabca0acfe02b8e18f59a4c95676012f49a304 upstream.
We can stall RCU processing on SMP platforms if a CPU sits in its idle
loop for a long time. This happens because we don't call irq_enter()
and irq_exit() around generic_smp_call_function_interrupt() and
friends. Add the necessary calls, and remove the one from within
ipi_timer(), so that they're all in a common place.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[add irq_enter()/irq_exit() in do_local_timer]
Signed-off-by: UCHINO Satoshi <satoshi.uchino@toshiba.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/smp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 32ce3530bcc6..a9f157bce18f 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -447,7 +447,9 @@ asmlinkage void __exception_irq_entry do_local_timer(struct pt_regs *regs) if (local_timer_ack()) { __inc_irq_stat(cpu, local_timer_irqs); + irq_enter(); ipi_timer(); + irq_exit(); } set_irq_regs(old_regs); |