linux-kernel - [PATCH 4/4] x86: ioremap: fix normal ram range check

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Date:	Fri, 11 Jun 2010 18:21:48 +0900
From:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
CC:	linux-pci@...r.kernel.org, jbarnes@...tuousgeek.org
Subject: [PATCH 4/4] x86: ioremap: fix normal ram range check

Check for norma RAM in x86 ioremap() code seems to not work for the
last page frame in the specified physical address range.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>

---
 arch/x86/mm/ioremap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.34/arch/x86/mm/ioremap.c
===================================================================
--- linux-2.6.34.orig/arch/x86/mm/ioremap.c	2010-06-10 07:28:33.146375380 +0900
+++ linux-2.6.34/arch/x86/mm/ioremap.c	2010-06-10 07:32:59.211196516 +0900
@@ -100,7 +100,7 @@
 	 * Don't allow anybody to remap normal RAM that we're using..
 	 */
 	last_pfn = last_addr >> PAGE_SHIFT;
-	for (pfn = phys_addr >> PAGE_SHIFT; pfn < last_pfn; pfn++) {
+	for (pfn = phys_addr >> PAGE_SHIFT; pfn <= last_pfn; pfn++) {
 		int is_ram = page_is_ram(pfn);
 
 		if (is_ram && pfn_valid(pfn) && !PageReserved(pfn_to_page(pfn)))


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