[tip:x86/mm] x86, iomap: Fix wrong page aligned size calculation in ioremapping code

[tip-bot for Florian Zumbiehl <florz@florz.de>]

Commit-ID:  468c30f2bbdf1ba0fbf16667eade23a46eaa8f06
Gitweb:     http://git.kernel.org/tip/468c30f2bbdf1ba0fbf16667eade23a46eaa8f06
Author:     Florian Zumbiehl <florz@florz.de>
AuthorDate: Tue, 20 Jul 2010 15:19:47 -0700
Committer:  H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Tue, 20 Jul 2010 16:56:35 -0700

x86, iomap: Fix wrong page aligned size calculation in ioremapping code

x86 early_iounmap(): fix off-by-one error in page alignment of allocation
size for sizes where size%PAGE_SIZE==1.

Signed-off-by: Florian Zumbiehl <florz@florz.de>
LKML-Reference: <201007202219.o6KMJlES021058@imap1.linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
 arch/x86/mm/ioremap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index d41d3a9..3ba6e06 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -611,7 +611,7 @@ void __init early_iounmap(void __iomem *addr, unsigned long size)
 		return;
 	}
 	offset = virt_addr & ~PAGE_MASK;
-	nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT;
+	nrpages = PAGE_ALIGN(offset + size) >> PAGE_SHIFT;
 
 	idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
 	while (nrpages > 0) {