From 4b5014bcdce9dd51d6a084a15d2264be527ed2b0 Mon Sep 17 00:00:00 2001 From: Russell King Date: Thu, 19 Jan 2012 15:20:58 +0000 Subject: [PATCH] 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 [add irq_enter()/irq_exit() in do_local_timer] Signed-off-by: UCHINO Satoshi Signed-off-by: Greg Kroah-Hartman --- arch/arm/kernel/smp.c | 2 ++ 1 file changed, 2 insertions(+) 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); -- 2.39.5