From: Siddha, Suresh B Date: Wed, 30 Jan 2008 12:33:43 +0000 (+0100) Subject: x86: set strong uncacheable where UC is really desired X-Git-Tag: v2.6.25-rc1~1143^2~133 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4138cc3418f5eaa7524ff8e927102863f1ba0ea5;p=linux-2.6 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 Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- diff --git a/arch/x86/mm/ioremap_32.c b/arch/x86/mm/ioremap_32.c index 0b278315d7..ef0f6a452e 100644 --- a/arch/x86/mm/ioremap_32.c +++ b/arch/x86/mm/ioremap_32.c @@ -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; diff --git a/arch/x86/mm/ioremap_64.c b/arch/x86/mm/ioremap_64.c index d6cf149768..2815ab6000 100644 --- a/arch/x86/mm/ioremap_64.c +++ b/arch/x86/mm/ioremap_64.c @@ -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);