On 01.03.2011 [17:00:47 +1100], Anton Blanchard wrote:
>
> A number of drivers are using pgprot_writecombine() to enable write
> combining on userspace mappings. Implement it on powerpc.
Given this patch, should drivers/infiniband/hw/cxgb4/t4.h
be updated?:
static inline pgprot_t t4_pgprot_wc(pgprot_t prot)
{
#if defined(__i386__) || defined(__x86_64__)
return pgprot_writecombine(prot);
#elif defined(CONFIG_PPC64)
return __pgprot((pgprot_val(prot) | _PAGE_NO_CACHE) &
~(pgprot_t)_PAGE_GUARDED);
#else
return pgprot_noncached(prot);
#endif
}
Thanks,
Nish
> Signed-off-by: Anton Blanchard <an...@samba.org>
> ---
>
> diff --git a/arch/powerpc/include/asm/pgtable.h
> b/arch/powerpc/include/asm/pgtable.h
> index 89f1587..88b0bd9 100644
> --- a/arch/powerpc/include/asm/pgtable.h
> +++ b/arch/powerpc/include/asm/pgtable.h
> @@ -170,6 +170,7 @@ extern int ptep_set_access_flags(struct vm_area_struct
> *vma, unsigned long addre
> #define pgprot_cached_wthru(prot) (__pgprot((pgprot_val(prot) &
> ~_PAGE_CACHE_CTL) | \
> _PAGE_COHERENT | _PAGE_WRITETHRU))
>
> +#define pgprot_writecombine pgprot_noncached_wc
>
> struct file;
> extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
> _______________________________________________
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--
Nishanth Aravamudan <n...@us.ibm.com>
IBM Linux Technology Center
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