x86/nmi: Remove irq_work from the long duration NMI handler

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[ Upstream commit 248ed51048 ]

First, printk() is NMI-context safe now since the safe printk() has been
implemented and it already has an irq_work to make NMI-context safe.

Second, this NMI irq_work actually does not work if a NMI handler causes
panic by watchdog timeout. It has no chance to run in such case, while
the safe printk() will flush its per-cpu buffers before panicking.

While at it, repurpose the irq_work callback into a function which
concentrates the NMI duration checking and makes the code easier to
follow.

 [ bp: Massage. ]

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200111125427.15662-1-changbin.du@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Changbin Du 2020-01-11 20:54:27 +08:00 • committed by Greg Kroah-Hartman

parent efa7868394

commit a87392f7c4

2 changed files with 9 additions and 12 deletions

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1

arch/x86/include/asm/nmi.h

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20

arch/x86/kernel/nmi.c

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