diff options
| -rw-r--r-- | arch/x86/mm/ioremap.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index c004d94608f..1a88d1572a7 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -116,7 +116,7 @@ static void __iomem *__ioremap(unsigned long phys_addr, unsigned long size, { void __iomem *addr; struct vm_struct *area; - unsigned long offset, last_addr; + unsigned long pfn, offset, last_addr; pgprot_t prot; /* Don't allow wraparound or zero size */ @@ -133,9 +133,10 @@ static void __iomem *__ioremap(unsigned long phys_addr, unsigned long size, /* * Don't allow anybody to remap normal RAM that we're using.. */ - for (offset = phys_addr >> PAGE_SHIFT; offset < max_pfn_mapped && - (offset << PAGE_SHIFT) < last_addr; offset++) { - if (page_is_ram(offset)) + for (pfn = phys_addr >> PAGE_SHIFT; pfn < max_pfn_mapped && + (pfn << PAGE_SHIFT) < last_addr; pfn++) { + if (page_is_ram(pfn) && pfn_valid(pfn) && + !PageReserved(pfn_to_page(pfn))) return NULL; } |