preempt: Move PREEMPT_NEED_RESCHED definition into arch code (08861d33) · Commits · 戴 / test

PREEMPT_NEED_RESCHED is never used directly, so move it into the arch code where it can potentially be implemented using either a different bit in the preempt count or as an entirely separate entity. Cc: Robert Love <rml@tech9.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Acked-by:

Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:

Will Deacon <will.deacon@arm.com>

arch/s390/include/asm/preempt.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -8,6 +8,8 @@

		#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES

		/* We use the MSB mostly because its available */
		#define PREEMPT_NEED_RESCHED 0x80000000
		#define PREEMPT_ENABLED (0 + PREEMPT_NEED_RESCHED)

		static inline int preempt_count(void)

arch/x86/include/asm/preempt.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -8,6 +8,9 @@

		DECLARE_PER_CPU(int, __preempt_count);

		/* We use the MSB mostly because its available */
		#define PREEMPT_NEED_RESCHED 0x80000000

		/*
		* We use the PREEMPT_NEED_RESCHED bit as an inverted NEED_RESCHED such
		* that a decrement hitting 0 means we can and should reschedule.

include/linux/preempt.h

+0 −3

Original line number	Diff line number	Diff line
		@@ -53,9 +53,6 @@

		#define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET)

		/* We use the MSB mostly because its available */
		#define PREEMPT_NEED_RESCHED 0x80000000

		#define PREEMPT_DISABLED (PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED)

		/*

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