On Mon, 27 Oct 2014, Toshi Kani wrote:
> diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c
> index ee58a0b..96aa8bf 100644
> --- a/arch/x86/mm/iomap_32.c
> +++ b/arch/x86/mm/iomap_32.c
> @@ -70,29 +70,23 @@ void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t
> prot)
> return (void *)vaddr;
> }
>
> -/*
> - * Map 'pfn' using protections 'prot'
> - */
> -#define __PAGE_KERNEL_WC (__PAGE_KERNEL | \
> - cachemode2protval(_PAGE_CACHE_MODE_WC))
> -
> void __iomem *
> iomap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot)
> {
> /*
> - * 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."
> + * For non-PAT systems, translate non-WB request to UC- just in
> + * case the caller set the PWT bit to prot directly without using
> + * pgprot_writecombine(). UC- translates to uncached if the MTRR
> + * is UC or WC. UC- 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) == __PAGE_KERNEL_WC)
> + if (!pat_enabled && pgprot2cachemode(prot) != _PAGE_CACHE_MODE_WB)
> prot = __pgprot(__PAGE_KERNEL |
> cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS));
>
> return (void __force __iomem *) kmap_atomic_prot_pfn(pfn, prot);
> }
> EXPORT_SYMBOL_GPL(iomap_atomic_prot_pfn);
> -#undef __PAGE_KERNEL_WC
Rejects. Please update against Juergens latest.
Thanks,
tglx
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