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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>
This commit is contained in:
Anton Blanchard 2014-08-05 14:55:00 +10:00 committed by Benjamin Herrenschmidt
parent 56758e3c3c
commit a71d64b4dc
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/xmon/xmon.c
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@ -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;