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arm64: entry: Remove unneeded need_resched() loop 

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>
Reviewed-by: Julien Thierry <julien.thierry@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Julien Grall <julien.grall@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Valentin Schneider 2019-01-31 18:23:37 +00:00 committed by Catalin Marinas
parent 67f52a9540
commit 8aa67d18a4
1 changed files with 1 additions and 10 deletions
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11
arch/arm64/kernel/entry.S
View File

@ -611,7 +611,7 @@ el1_irq:
#ifdef CONFIG_PREEMPT #ifdef CONFIG_PREEMPT
ldr x24, [tsk, #TSK_TI_PREEMPT] // get preempt count ldr x24, [tsk, #TSK_TI_PREEMPT] // get preempt count
cbnz x24, 1f // preempt count != 0 cbnz x24, 1f // preempt count != 0
bl el1_preempt bl preempt_schedule_irq // irq en/disable is done inside
1: 1:
#endif #endif
#ifdef CONFIG_TRACE_IRQFLAGS #ifdef CONFIG_TRACE_IRQFLAGS
@ -620,15 +620,6 @@ el1_irq:
kernel_exit 1 kernel_exit 1
ENDPROC(el1_irq) 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. * EL0 mode handlers.
*/ */