powerpc/watchdog: Do not trigger SMP crash from touch_nmi_watchdog

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[ Upstream commit 80e4d70b06 ]

In xmon, touch_nmi_watchdog() is not expected to be checking that
other CPUs have not touched the watchdog, so the code will just call
touch_nmi_watchdog() once before re-enabling hard interrupts.

Just update our CPU's state, and ignore apparently stuck SMP threads.

Arguably touch_nmi_watchdog should check for SMP lockups, and callers
should be fixed, but that's not trivial for the input code of xmon.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Nicholas Piggin 2017-09-29 13:29:39 +10:00 • committed by Greg Kroah-Hartman

parent 97f41b41c4

commit fa21a13d76

1 changed files with 5 additions and 2 deletions

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arch/powerpc/kernel/watchdog.c

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