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preempt/dynamic: Provide irqentry_exit_cond_resched() static call
Provide static call to control IRQ preemption (called in CONFIG_PREEMPT) so that we can override its behaviour when preempt= is overriden. Since the default behaviour is full preemption, its call is initialized to provide IRQ preemption when preempt= isn't passed. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/20210118141223.123667-8-frederic@kernel.org
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@ -2,6 +2,7 @@
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#ifndef __LINUX_ENTRYCOMMON_H
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#define __LINUX_ENTRYCOMMON_H
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#include <linux/static_call_types.h>
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#include <linux/tracehook.h>
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#include <linux/syscalls.h>
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#include <linux/seccomp.h>
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@ -454,6 +455,9 @@ irqentry_state_t noinstr irqentry_enter(struct pt_regs *regs);
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* Conditional reschedule with additional sanity checks.
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*/
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void irqentry_exit_cond_resched(void);
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#ifdef CONFIG_PREEMPT_DYNAMIC
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DECLARE_STATIC_CALL(irqentry_exit_cond_resched, irqentry_exit_cond_resched);
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#endif
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/**
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* irqentry_exit - Handle return from exception that used irqentry_enter()
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@ -385,6 +385,9 @@ void irqentry_exit_cond_resched(void)
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preempt_schedule_irq();
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}
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}
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#ifdef CONFIG_PREEMPT_DYNAMIC
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DEFINE_STATIC_CALL(irqentry_exit_cond_resched, irqentry_exit_cond_resched);
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#endif
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noinstr void irqentry_exit(struct pt_regs *regs, irqentry_state_t state)
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{
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@ -411,8 +414,13 @@ noinstr void irqentry_exit(struct pt_regs *regs, irqentry_state_t state)
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}
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instrumentation_begin();
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if (IS_ENABLED(CONFIG_PREEMPTION))
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if (IS_ENABLED(CONFIG_PREEMPTION)) {
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#ifdef CONFIG_PREEMT_DYNAMIC
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static_call(irqentry_exit_cond_resched)();
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#else
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irqentry_exit_cond_resched();
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#endif
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}
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/* Covers both tracing and lockdep */
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trace_hardirqs_on();
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instrumentation_end();
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