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softirq: Add debug check to __raise_softirq_irqoff()

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__raise_softirq_irqoff() must be called with interrupts disabled to protect
the per CPU softirq pending state update against an interrupt and soft
interrupt handling on return from interrupt.

Add a lockdep assertion to validate the calling convention.

[ tglx: Massaged changelog ]

Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20200814045522.45719-1-Jiafei.Pan@nxp.com
This commit is contained in:
Jiafei Pan 2020-08-14 12:55:22 +08:00 committed by Thomas Gleixner
parent 856deb866d
commit cdabce2e3d
1 changed files with 1 additions and 0 deletions
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kernel/softirq.c
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@ -481,6 +481,7 @@ void raise_softirq(unsigned int nr)
void __raise_softirq_irqoff(unsigned int nr)
{
lockdep_assert_irqs_disabled();
trace_softirq_raise(nr);
or_softirq_pending(1UL << nr);
}