linux-kernel - [PATCH RT] enable interrupts in do_page_fault for users (take 2

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Date:	Wed, 06 Jun 2007 21:42:27 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: [PATCH RT] enable interrupts in do_page_fault for users (take 2 -
	add i386 fix too)

Thomas,

Can you replace my previous patch with this one. This one includes the
fix for i386.

-- Steve

Index: linux-2.6.21-rt9/arch/x86_64/mm/fault.c
===================================================================
--- linux-2.6.21-rt9.orig/arch/x86_64/mm/fault.c
+++ linux-2.6.21-rt9/arch/x86_64/mm/fault.c
@@ -476,6 +476,10 @@ bad_area:
 bad_area_nosemaphore:
 	/* User mode accesses just cause a SIGSEGV */
 	if (error_code & PF_USER) {
+
+		/* it's possible to have interrupts off here */
+		local_irq_enable();
+
 		if (is_prefetch(regs, address, error_code))
 			return;
 
Index: linux-2.6.21-rt9/arch/i386/mm/fault.c
===================================================================
--- linux-2.6.21-rt9.orig/arch/i386/mm/fault.c
+++ linux-2.6.21-rt9/arch/i386/mm/fault.c
@@ -459,6 +459,10 @@ bad_area:
 bad_area_nosemaphore:
 	/* User mode accesses just cause a SIGSEGV */
 	if (error_code & 4) {
+
+		/* it's possible to have interrupts off here */
+		local_irq_enable();
+
 		/* 
 		 * Valid to do another page fault here because this one came 
 		 * from user space.


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