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x86, ioremap: Fix normal ram range check

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Check for normal 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@jp.fujitsu.com>
LKML-Reference: <4C1AE6CD.1080704@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Kenji Kaneshige 2010-06-18 12:23:57 +09:00 committed by H. Peter Anvin
parent ffa71f33a8
commit 35be1b716a
1 changed files with 1 additions and 1 deletions
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2
arch/x86/mm/ioremap.c
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@ -101,7 +101,7 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
* 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)))