powerpc/entry: Remove unneeded need_resched() loop (90437bff) · Commits · 戴 / test

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. Signed-off-by:

Valentin Schneider <valentin.schneider@arm.com> [mpe: Rebase since CURRENT_THREAD_INFO() removal] Signed-off-by:

Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/entry_32.S

+1 −4

Original line number	Diff line number	Diff line
		@@ -906,10 +906,7 @@ resume_kernel:
		*/
		bl trace_hardirqs_off
		#endif
		1: bl preempt_schedule_irq
		lwz r3,TI_FLAGS(r2)
		andi. r0,r3,_TIF_NEED_RESCHED
		bne- 1b
		bl preempt_schedule_irq
		#ifdef CONFIG_TRACE_IRQFLAGS
		/* And now, to properly rebalance the above, we tell lockdep they
		* are being turned back on, which will happen when we return

arch/powerpc/kernel/entry_64.S

+1 −7

Original line number	Diff line number	Diff line
		@@ -865,13 +865,7 @@ resume_kernel:
		* sure we are soft-disabled first and reconcile irq state.
		*/
		RECONCILE_IRQ_STATE(r3,r4)
		1: bl preempt_schedule_irq

		/* Re-test flags and eventually loop */
		ld r9, PACA_THREAD_INFO(r13)
		ld r4,TI_FLAGS(r9)
		andi. r0,r4,_TIF_NEED_RESCHED
		bne 1b
		bl preempt_schedule_irq

		/*
		* arch_local_irq_restore() from preempt_schedule_irq above may

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