From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sebastian Andrzej Siewior Subject: [PATCH RT] arm: lazy preempt: correct resched condition Date: Tue, 24 May 2016 13:30:36 +0200 Message-ID: <20160524113036.GA27094@linutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de, Steven Rostedt To: linux-rt-users@vger.kernel.org Return-path: Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-rt-users.vger.kernel.org If we get out of preempt_schedule_irq() then we check for NEED_RESCHED and call the former function again if set because the preemption counter has be zero at this point. However the counter for lazy-preempt might not be zero therefore we have to check the counter before looking at the need_resched_lazy flag. Signed-off-by: Sebastian Andrzej Siewior --- arch/arm/kernel/entry-armv.S | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index d66b1aef2083..d044cea59f54 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -244,7 +244,11 @@ ENDPROC(__irq_svc) bne 1b tst r0, #_TIF_NEED_RESCHED_LAZY reteq r8 @ go again - b 1b + ldr r0, [tsk, #TI_PREEMPT_LAZY] @ get preempt lazy count + teq r0, #0 @ if preempt lazy count != 0 + beq 1b + ret r8 @ go again + #endif __und_fault: -- 2.8.1