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powerpc/watchdog: Do not panic from locked CPU's IPI handler

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The SMP watchdog will detect locked CPUs and IPI them to print a
backtrace and registers. If panic on hard lockup is enabled, do not
panic from this handler, because that can cause recursion into the IPI
layer during the panic.

The caller already panics in this case.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-09-29 13:29:37 +10:00 committed by Michael Ellerman
parent 8512bffd62
commit 842dc1dbab
1 changed files with 1 additions and 2 deletions
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3
arch/powerpc/kernel/watchdog.c
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@ -97,8 +97,7 @@ static void wd_lockup_ipi(struct pt_regs *regs)
else
dump_stack();
if (hardlockup_panic)
nmi_panic(regs, "Hard LOCKUP");
/* Do not panic from here because that can recurse into NMI IPI layer */
}
static void set_cpumask_stuck(const struct cpumask *cpumask, u64 tb)