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Commit 5bc64bd2 authored by Helge Deller's avatar Helge Deller
Browse files

parisc: Disable further stack checks when panic occurs during stack check 



Before the irq handler detects a low stack and then panics the kernel, disable
further stack checks to avoid recursive panics.

Reported-by: default avatarJohn David Anglin <dave.anglin@bell.net>
Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent a56e88ec

arch/parisc/kernel/irq.c

+7 −1
Original line number Diff line number Diff line
@@ -413,6 +413,10 @@ static inline void stack_overflow_check(struct pt_regs *regs) 
	if (regs->sr[7])

		return;



	/* exit if already in panic */

	if (sysctl_panic_on_stackoverflow < 0)

		return;



	/* calculate kernel stack usage */

	stack_usage = sp - stack_start;

#ifdef CONFIG_IRQSTACKS
@@ -454,8 +458,10 @@ static inline void stack_overflow_check(struct pt_regs *regs) 
#ifdef CONFIG_IRQSTACKS

panic_check:

#endif

	if (sysctl_panic_on_stackoverflow)

	if (sysctl_panic_on_stackoverflow) {

		sysctl_panic_on_stackoverflow = -1; /* disable further checks */

		panic("low stack detected by irq handler - check messages\n");

	}

#endif

}