[PATCH v2] x86/entry: Use should_resched() in idtentry_exit_cond_resched()

From: Sebastian Andrzej Siewior
Date: Wed Jul 01 2020 - 04:35:59 EST


The TIF_NEED_RESCHED bit is inlined on x86 into the preemption counter.
By using should_resched(0) instead of need_resched() the same check can
be performed which uses the same variable as 'preempt_count()` which was
issued before.

Use should_resched(0) instead need_resched().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
v1âv2: Use should_resched() but keep the !preempt_count() check.

arch/x86/entry/common.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index bd3f14175193c..0bb6966f62738 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -615,11 +615,11 @@ static void idtentry_exit_cond_resched(struct pt_regs *regs, bool may_sched)
if (may_sched && !preempt_count()) {
/* Sanity check RCU and thread stack */
rcu_irq_exit_check_preempt();
if (IS_ENABLED(CONFIG_DEBUG_ENTRY))
WARN_ON_ONCE(!on_thread_stack());
- if (need_resched())
+ if (should_resched(0))
preempt_schedule_irq();
}
/* Covers both tracing and lockdep */
trace_hardirqs_on();
}
--
2.27.0