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x86: set strong uncacheable where UC is really desired 

Also use _PAGE_PWT for all the mappings which need uncache mapping.
Instead of existing PAT2 which is UC- (and can be overwritten by MTRRs),
we now use PAT3 which is strong uncacheable.

This makes it consistent with pgprot_noncached()

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Siddha, Suresh B 2008-01-30 13:33:43 +01:00 committed by Ingo Molnar
parent fbd3bfd87f
commit 4138cc3418
2 changed files with 2 additions and 2 deletions
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2
arch/x86/mm/ioremap_32.c
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@ -119,7 +119,7 @@ EXPORT_SYMBOL(__ioremap);
void __iomem *ioremap_nocache (unsigned long phys_addr, unsigned long size)
{
unsigned long last_addr;
void __iomem *p = __ioremap(phys_addr, size, _PAGE_PCD);
void __iomem *p = __ioremap(phys_addr, size, _PAGE_PCD | _PAGE_PWT);
if (!p)
return p;

2
arch/x86/mm/ioremap_64.c
View File

@ -138,7 +138,7 @@ EXPORT_SYMBOL(__ioremap);
void __iomem *ioremap_nocache (unsigned long phys_addr, unsigned long size)
{
return __ioremap(phys_addr, size, _PAGE_PCD);
return __ioremap(phys_addr, size, _PAGE_PCD | _PAGE_PWT);
}
EXPORT_SYMBOL(ioremap_nocache);