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x86: fix ioremap RAM check 

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2008-01-30 13:34:06 +01:00 committed by Ingo Molnar
parent 950f9d95be
commit 266b9f8727
1 changed files with 4 additions and 13 deletions
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17
arch/x86/mm/ioremap.c
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@ -125,23 +125,14 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS)
return (__force void __iomem *)phys_to_virt(phys_addr);
#ifdef CONFIG_X86_32
/*
* Don't allow anybody to remap normal RAM that we're using..
*/
if (phys_addr <= virt_to_phys(high_memory - 1)) {
char *t_addr, *t_end;
struct page *page;
t_addr = __va(phys_addr);
t_end = t_addr + (size - 1);
for (page = virt_to_page(t_addr);
page <= virt_to_page(t_end); page++)
if (!PageReserved(page))
return NULL;
for (offset = phys_addr >> PAGE_SHIFT; offset < max_pfn_mapped &&
(offset << PAGE_SHIFT) < last_addr; offset++) {
if (page_is_ram(offset))
return NULL;
}
#endif
pgprot = MAKE_GLOBAL(__PAGE_KERNEL | flags);