Commit a71d64b4 authored Aug 05, 2014 by Anton Blanchard Committed by Benjamin Herrenschmidt Aug 13, 2014

powerpc: Hard disable interrupts in xmon



xmon only soft disables interrupts. This seems like a bad idea - we
certainly don't want decrementer and PMU exceptions going off when
we are debugging something inside xmon.

This issue was uncovered when the hard lockup detector went off
inside xmon. To ensure we wont get a spurious hard lockup warning,
I also call touch_nmi_watchdog() when exiting xmon.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

parent 56758e3c

arch/powerpc/xmon/xmon.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -24,6 +24,7 @@
		#include <linux/interrupt.h>
		#include <linux/irq.h>
		#include <linux/bug.h>
		#include <linux/nmi.h>

		#include <asm/ptrace.h>
		#include <asm/string.h>
		@@ -374,6 +375,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
		#endif

		local_irq_save(flags);
		hard_irq_disable();

		bp = in_breakpoint_table(regs->nip, &offset);
		if (bp != NULL) {
		@@ -558,6 +560,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
		#endif
		insert_cpu_bpts();

		touch_nmi_watchdog();
		local_irq_restore(flags);

		return cmd != 'X' && cmd != EOF;