linux-kernel - [PATCH] x86: mm: introduce helper function in fault.c

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Date:	Wed, 04 Feb 2009 15:24:09 -0800
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] x86: mm: introduce helper function in fault.c

From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>

Impact: cleanup

Introduce helper function fault_in_kernel_address() to make editors happy.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
---
 arch/x86/mm/fault.c |   15 ++++++++++-----
 1 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index bfac289..27ec123 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -783,6 +783,15 @@ static inline int access_error(unsigned long error_code, int write,
 	return 0;
 }
 
+static int fault_in_kernel_space(unsigned long address)
+{
+#ifdef CONFIG_X86_32
+	return address >= TASK_SIZE;
+#else /* !CONFIG_X86_32 */
+	return address >= TASK_SIZE64;
+#endif /* CONFIG_X86_32 */
+}
+
 /*
  * This routine handles page faults.  It determines the address,
  * and the problem, and then passes it off to one of the appropriate
@@ -832,11 +841,7 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
 	 * (error_code & 4) == 0, and that the fault was not a
 	 * protection error (error_code & 9) == 0.
 	 */
-#ifdef CONFIG_X86_32
-	if (unlikely(address >= TASK_SIZE)) {
-#else
-	if (unlikely(address >= TASK_SIZE64)) {
-#endif
+	if (unlikely(fault_in_kernel_space(address))) {
 		if (!(error_code & (PF_RSVD | PF_USER | PF_PROT))) {
 			if (vmalloc_fault(address) >= 0)
 				return;
-- 
1.6.1.2

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