From: Valentin Schneider <valentin.schneider@arm.com>
To: linux-kernel@vger.kernel.org
Cc: Julien Thierry <julien.thierry@arm.com>,
Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Marc Zyngier <marc.zyngier@arm.com>,
Julien Grall <julien.grall@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 1/3] arm64: entry: Remove unneeded need_resched() loop
Date: Thu, 31 Jan 2019 18:23:37 +0000 [thread overview]
Message-ID: <20190131182339.9835-2-valentin.schneider@arm.com> (raw)
In-Reply-To: <20190131182339.9835-1-valentin.schneider@arm.com>
Since the enabling and disabling of IRQs within preempt_schedule_irq()
is contained in a need_resched() loop, we don't need the outer arch
code loop.
Reported-by: Julien Thierry <julien.thierry@arm.com>
Reported-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Julien Grall <julien.grall@arm.com>
Cc: Julien Thierry <julien.thierry@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arm-kernel@lists.infradead.org
---
arch/arm64/kernel/entry.S | 11 +----------
1 file changed, 1 insertion(+), 10 deletions(-)
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 0ec0c46b2c0c..4d0c81f29a60 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -611,7 +611,7 @@ el1_irq:
#ifdef CONFIG_PREEMPT
ldr x24, [tsk, #TSK_TI_PREEMPT] // get preempt count
cbnz x24, 1f // preempt count != 0
- bl el1_preempt
+ bl preempt_schedule_irq // irq en/disable is done inside
1:
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
@@ -620,15 +620,6 @@ el1_irq:
kernel_exit 1
ENDPROC(el1_irq)
-#ifdef CONFIG_PREEMPT
-el1_preempt:
- mov x24, lr
-1: bl preempt_schedule_irq // irq en/disable is done inside
- ldr x0, [tsk, #TSK_TI_FLAGS] // get new tasks TI_FLAGS
- tbnz x0, #TIF_NEED_RESCHED, 1b // needs rescheduling?
- ret x24
-#endif
-
/*
* EL0 mode handlers.
*/
--
2.20.1
next prev parent reply other threads:[~2019-01-31 18:24 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-31 18:23 [RFC PATCH 0/3] arm/arm64: entry: Remove need_resched() loop Valentin Schneider
2019-01-31 18:23 ` Valentin Schneider [this message]
2019-02-01 8:46 ` [RFC PATCH 1/3] arm64: entry: Remove unneeded " Julien Thierry
2019-02-01 10:21 ` Will Deacon
2019-02-04 16:55 ` Catalin Marinas
2019-01-31 18:23 ` [RFC PATCH 2/3] ARM: " Valentin Schneider
2019-02-01 8:49 ` Julien Thierry
2019-01-31 18:23 ` [RFC PATCH 3/3] sched/Documentation: Point out use of preempt_schedule_irq() Valentin Schneider
2019-02-01 8:45 ` Julien Thierry
2019-02-01 10:27 ` Valentin Schneider
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