linux-kernel - [PATCH] make Linux bootable on ARM again

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Date:	Fri, 25 Sep 2009 16:28:02 -0400 (EDT)
From:	Nicolas Pitre <nico@...xnic.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Frans Pop <elendil@...net.nl>, lkml <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org,
	Lennert Buytenhek <buytenh@...vell.com>
Subject: [PATCH] make Linux bootable on ARM again

Commit 200b812d00 "Clear the exclusive monitor when returning from an 
exception" broke the vast majority of ARM systems in the wild which are 
still pre ARMv6.  The kernel is crashing on the first occurrence of an 
exception due to the removal of the actual return instruction for them.  
Let's add it back.

Signed-off-by: Nicolas Pitre <nico@...vell.com>
---

diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index e17e3c3..ac34c0d 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -83,6 +83,8 @@
 	ldr	r0, [sp]
 	strex	r1, r2, [sp]			@ clear the exclusive monitor
 	ldmib	sp, {r1 - pc}^			@ load r1 - pc, cpsr
+#else
+	ldmia	sp, {r0 - pc}^			@ load r0 - pc, cpsr
 #endif
 	.endm
 
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