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Blackfin: allow NMI watchdog to be used w/RETN as a scratch reg 

NMIs are not safe to return from because many anomaly workarounds are
implemented by disabling interrupts.  The NMI obviously violates this
assumption.  Since the NMI watchdog never returns, we don't have to
worry about it clobbering RETN when it is being used as a scratch register
with the exception stack.

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Graf Yang 2010-03-17 09:00:32 +00:00 committed by Mike Frysinger
parent 6ce3e9c2a2
commit c429886a70
1 changed files with 1 additions and 1 deletions
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arch/blackfin/Kconfig.debug
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@ -238,7 +238,7 @@ config EARLY_PRINTK
config NMI_WATCHDOG
bool "Enable NMI watchdog to help debugging lockup on SMP"
default n
depends on (SMP && !BFIN_SCRATCH_REG_RETN)
depends on SMP
help
If any CPU in the system does not execute the period local timer
interrupt for more than 5 seconds, then the NMI handler dumps debug