@Thomas Gleixner, any more comments for v2 patch? Can we merge it? Thanks.
Best Regards,
Jiafei.
> -----Original Message-----
> From: Jiafei Pan <jiafei....@nxp.com>
> Sent: Friday, August 14, 2020 12:55 PM
> To: pet...@infradead.org; mi...@kernel.org; t...@linutronix.de;
> rost...@goodmis.org; romain.per...@gmail.com; w...@kernel.org
> Cc: linux-kernel@vger.kernel.org; linux-rt-us...@vger.kernel.org; Jiafei Pan
> <jiafei....@nxp.com>; Leo Li <leoyang...@nxp.com>; Vladimir Oltean
> <vladimir.olt...@nxp.com>; Jiafei Pan <jiafei....@nxp.com>
> Subject: [PATCH v2] softirq: add irq off checking for __raise_softirq_irqoff
>
> __raise_softirq_irqoff() will update per-CPU mask of pending softirqs,
> it need to be called in irq disabled context in order to keep it atomic
> operation, otherwise it will be interrupted by hardware interrupt,
> and per-CPU softirqs pending mask will be corrupted, the result is
> there will be unexpected issue, for example hrtimer soft irq will
> be losed and soft hrtimer will never be expire and handled.
>
> Enable CONFIG_PROVE_LOCKING to use lockdep_assert_irqs_disabled() to
> check hardirqs and softirqs status, and provide warning in irqs enabled
> context.
>
> Signed-off-by: Jiafei Pan <jiafei....@nxp.com>
> ---
> Changes in v2:
> - use lockdep_assert_irqs_disabled()
> - removed extra comments
> - changed commit message
>
> kernel/softirq.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/kernel/softirq.c b/kernel/softirq.c
> index bf88d7f62433..09229ad82209 100644
> --- a/kernel/softirq.c
> +++ b/kernel/softirq.c
> @@ -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);
> }
> --
> 2.17.1
