x86: Select CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK

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Now that all invocations of irq_exit_rcu() happen on the irq stack, turn on
CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK which causes the core code to invoke
__do_softirq() directly without going through do_softirq_own_stack().

That means do_softirq_own_stack() is only invoked from task context which
means it can't be on the irq stack. Remove the conditional from
run_softirq_on_irqstack_cond() and rename the function accordingly.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210210002513.068033456@linutronix.de

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Thomas Gleixner 2021-02-10 00:40:51 +01:00

parent 52d743f3b7

commit 624db9eabc

3 changed files with 10 additions and 12 deletions

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1

arch/x86/Kconfig

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19

arch/x86/include/asm/irq_stack.h

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2

arch/x86/kernel/irq_64.c

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