linux-kernel - [tip:x86/asm] x86/mm/fault: Use TASK_SIZE_MAX in is

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Message-ID: <tip-d31bf07f71a5568b48c5ed448e4299050469f615@git.kernel.org>
Date:	Mon, 23 Mar 2015 05:20:00 -0700
From:	tip-bot for Andy Lutomirski <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	tglx@...utronix.de, dvlasenk@...hat.com, bp@...en8.de,
	spender@...ecurity.net, mingo@...nel.org,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	torvalds@...ux-foundation.org, luto@...nel.org
Subject: [tip:x86/asm] x86/mm/fault: Use TASK_SIZE_MAX in is_prefetch()

Commit-ID:  d31bf07f71a5568b48c5ed448e4299050469f615
Gitweb:     http://git.kernel.org/tip/d31bf07f71a5568b48c5ed448e4299050469f615
Author:     Andy Lutomirski <luto@...nel.org>
AuthorDate: Wed, 18 Mar 2015 18:33:27 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 23 Mar 2015 10:08:20 +0100

x86/mm/fault: Use TASK_SIZE_MAX in is_prefetch()

This is slightly shorter and slightly faster.  It's also more
correct: the split between user and kernel addresses is
TASK_SIZE_MAX, regardless of ti->flags.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brad Spengler <spender@...ecurity.net>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/09156b63bad90a327827003c9e53faa82ef4c56e.1426728647.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/mm/fault.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index ede025f..ae340d3 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -148,7 +148,7 @@ is_prefetch(struct pt_regs *regs, unsigned long error_code, unsigned long addr)
 	instr = (void *)convert_ip_to_linear(current, regs);
 	max_instr = instr + 15;
 
-	if (user_mode(regs) && instr >= (unsigned char *)TASK_SIZE)
+	if (user_mode(regs) && instr >= (unsigned char *)TASK_SIZE_MAX)
 		return 0;
 
 	while (instr < max_instr) {
--
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