From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Benjamin Herrenschmidt , Steven Rostedt Subject: [ 26/26] powerpc: Fix missing/delayed calls to irq_work Date: Tue, 18 Jun 2013 09:15:06 -0700 Message-Id: <20130618161238.791129680@linuxfoundation.org> In-Reply-To: <20130618161231.154881788@linuxfoundation.org> References: <20130618161231.154881788@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: From: Greg Kroah-Hartman 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Benjamin Herrenschmidt commit 230b3034793247f61e6a0b08c44cf415f6d92981 upstream. When replaying interrupts (as a result of the interrupt occurring while soft-disabled), in the case of the decrementer, we are exclusively testing for a pending timer target. However we also use decrementer interrupts to trigger the new "irq_work", which in this case would be missed. This change the logic to force a replay in both cases of a timer boundary reached and a decrementer interrupt having actually occurred while disabled. The former test is still useful to catch cases where a CPU having been hard-disabled for a long time completely misses the interrupt due to a decrementer rollover. Signed-off-by: Benjamin Herrenschmidt Tested-by: Steven Rostedt Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/kernel/irq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -162,7 +162,7 @@ notrace unsigned int __check_irq_replay( * in case we also had a rollover while hard disabled */ local_paca->irq_happened &= ~PACA_IRQ_DEC; - if (decrementer_check_overflow()) + if ((happened & PACA_IRQ_DEC) || decrementer_check_overflow()) return 0x900; /* Finally check if an external interrupt happened */