linux-kernel - [PATCH RT 3/4] sh: decouple the pagefault-disabled logic

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Date:	Thu, 12 Feb 2009 00:01:42 +0900
From:	Katsuya Matsubara <matsu@...l.co.jp>
To:	linux-rt-users <linux-rt-users@...r.kernel.org>
Cc:	Steven Rostedt <srostedt@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Mundt <lethal@...ux-sh.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Katsuya Matsubara <matsu@...l.co.jp>
Subject: [PATCH RT 3/4] sh: decouple the pagefault-disabled logic

The preempt-rt patch adds a pagefault-disabled logic. We must not take
page faults if pagefault_disabled > 0. The same treatment can be found
in other arch code.

Signed-off-by: Katsuya Matsubara <matsu@...l.co.jp>
---
 arch/sh/mm/fault_32.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/sh/mm/fault_32.c b/arch/sh/mm/fault_32.c
index 898d477..2746b08 100644
--- a/arch/sh/mm/fault_32.c
+++ b/arch/sh/mm/fault_32.c
@@ -100,7 +100,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
 	 * If we're in an interrupt or have no user
 	 * context, we must not take the fault..
 	 */
-	if (in_atomic() || !mm)
+	if (in_atomic() || !mm || current->pagefault_disabled)
 		goto no_context;
 
 	down_read(&mm->mmap_sem);
-- 
1.6.1

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