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Commit c429886a authored by Graf Yang's avatar Graf Yang Committed by Mike Frysinger
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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: default avatarGraf Yang <graf.yang@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent 6ce3e9c2

arch/blackfin/Kconfig.debug

+1 −1
Original line number Diff line number Diff line
@@ -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