From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Tue, 27 Jan 2009 23:20:00 +0000 (+0000)
Subject: [ARM] call undefined instruction exception handler with irqs enabled
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ecbab71c521819716e204659dfe72fc39d00630a;p=openwrt%2Fstaging%2Fblogic.git

[ARM] call undefined instruction exception handler with irqs enabled

Aaro says:
> With spinlock debugs enabled I get might_sleep() warnings when using
> ptrace.

tracked down to a missing enable_irq before calling do_undefinstr().

Reported-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Tested-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 77b047475539..85040cfeb5e5 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -650,6 +650,7 @@ ENTRY(fp_enter)
 no_fp:	mov	pc, lr
 
 __und_usr_unknown:
+	enable_irq
 	mov	r0, sp
 	adr	lr, ret_from_exception
 	b	do_undefinstr