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Groups > linux.kernel > #1441582
| From | Steven Rostedt <rostedt@goodmis.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH RT 09/14] arm: lazy preempt: correct resched condition |
| Date | 2016-07-12 19:00 +0200 |
| Message-ID | <rU9cn-7AG-57@gated-at.bofh.it> (permalink) |
| References | <rU92F-7wG-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.14.72-rt76-rc1 stable review patch. If anyone has any objections, please let me know. ------------------ From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> 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. Cc: stable-rt@vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> --- 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 62bc04cc9b7d..ceda9997a29d 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -234,7 +234,11 @@ svc_preempt: bne 1b tst r0, #_TIF_NEED_RESCHED_LAZY moveq pc, 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 + mov pc, r8 @ go again + #endif __und_fault: -- 2.8.1
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[PATCH RT 00/14] Linux 3.14.72-rt76-rc1 Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 14/14] Linux 3.14.72-rt76-rc1 Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 11/14] mm: perform lru_add_drain_all() remotely Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 10/14] locallock: add local_lock_on() Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 07/14] sched,preempt: Fix preempt_count manipulations Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 09/14] arm: lazy preempt: correct resched condition Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 08/14] kernel/printk: Dont try to print from IRQ/NMI region Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 04/14] list_bl: fixup bogus lockdep warning Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 03/14] net: dev: always take qdiscs busylock in __dev_xmit_skb() Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 Linux 3.14.72-rt76-rc2 Steven Rostedt <rostedt@goodmis.org> - 2016-07-13 01:30 +0200
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