From: Catalin Marinas <catalin.marinas@arm.com>
Date: Thu, 22 Aug 2013 10:47:37 +0000 (+0100)
Subject: arm64: Enable interrupts in the EL0 undef handler
X-Git-Tag: firefly_0821_release~3680^2~35^2~1^2~90
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0195e1c67cd4b47ed4c2dbd0a94e69543121e0f0;p=firefly-linux-kernel-4.4.55.git

arm64: Enable interrupts in the EL0 undef handler

do_undefinstr() has to be called with interrupts disabled since it may
read the instruction from the user address space which could lead to a
data abort and subsequent might_sleep() warning in do_page_fault().

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
(cherry picked from commit 2600e130b3c90c8d6c13229d3d3a14dcb898a87b)
Signed-off-by: Mark Brown <broonie@linaro.org>
---

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 6ad781b21c08..57640df9d70c 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -476,6 +476,8 @@ el0_undef:
 	 * Undefined instruction
 	 */
 	mov	x0, sp
+	// enable interrupts before calling the main handler
+	enable_irq
 	b	do_undefinstr
 el0_dbg:
 	/*