x86, ioremap: Fix normal ram range check
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>
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arch/x86/mm
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@ -101,7 +101,7 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
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* Don't allow anybody to remap normal RAM that we're using..
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*/
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last_pfn = last_addr >> PAGE_SHIFT;
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for (pfn = phys_addr >> PAGE_SHIFT; pfn < last_pfn; pfn++) {
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for (pfn = phys_addr >> PAGE_SHIFT; pfn <= last_pfn; pfn++) {
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int is_ram = page_is_ram(pfn);
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if (is_ram && pfn_valid(pfn) && !PageReserved(pfn_to_page(pfn)))
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