From e77414e0aad6a1b063ba5e5750c582c75327ea6a Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 5 Dec 2009 15:10:44 -0500
Subject: fix broken aliasing checks for MAP_FIXED on sparc32, mips, arm and sh

We want addr - (pgoff << PAGE_SHIFT) consistently coloured...

Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mips/kernel/syscall.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'arch/mips/kernel')

diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c
index c25b2e7dcb7b..3f7f466190b4 100644
--- a/arch/mips/kernel/syscall.c
+++ b/arch/mips/kernel/syscall.c
@@ -93,7 +93,8 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 		 * We do not accept a shared mapping if it would violate
 		 * cache aliasing constraints.
 		 */
-		if ((flags & MAP_SHARED) && (addr & shm_align_mask))
+		if ((flags & MAP_SHARED) &&
+		    ((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))
 			return -EINVAL;
 		return addr;
 	}
-- 
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