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| author | Ingo Molnar <mingo@elte.hu> | 2009-01-27 12:01:51 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-01-27 12:01:51 +0100 |
| commit | 3ddeb51d9c83931c1ca6abf76a38934c5a1ed918 (patch) | |
| tree | fc2efb59d627135ea2199a8a68415b162646b121 /arch/x86/mm/iomap_32.c | |
| parent | 5a611268b69f05262936dd177205acbce4471358 (diff) | |
| parent | 5ee810072175042775e39bdd3eaaa68884c27805 (diff) | |
| download | linux-stable-3ddeb51d9c83931c1ca6abf76a38934c5a1ed918.tar.gz linux-stable-3ddeb51d9c83931c1ca6abf76a38934c5a1ed918.tar.bz2 linux-stable-3ddeb51d9c83931c1ca6abf76a38934c5a1ed918.zip | |
Merge branch 'linus' into core/percpu
Conflicts:
arch/x86/kernel/setup_percpu.c
Diffstat (limited to 'arch/x86/mm/iomap_32.c')
| -rw-r--r-- | arch/x86/mm/iomap_32.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c index d0151d8ce452..ca53224fc56c 100644 --- a/arch/x86/mm/iomap_32.c +++ b/arch/x86/mm/iomap_32.c @@ -17,6 +17,7 @@ */ #include <asm/iomap.h> +#include <asm/pat.h> #include <linux/module.h> /* Map 'pfn' using fixed map 'type' and protections 'prot' @@ -29,6 +30,15 @@ iomap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot) pagefault_disable(); + /* + * For non-PAT systems, promote PAGE_KERNEL_WC to PAGE_KERNEL_UC_MINUS. + * PAGE_KERNEL_WC maps to PWT, which translates to uncached if the + * MTRR is UC or WC. UC_MINUS gets the real intention, of the + * user, which is "WC if the MTRR is WC, UC if you can't do that." + */ + if (!pat_enabled && pgprot_val(prot) == pgprot_val(PAGE_KERNEL_WC)) + prot = PAGE_KERNEL_UC_MINUS; + idx = type + KM_TYPE_NR*smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); set_pte(kmap_pte-idx, pfn_pte(pfn, prot)); |