[PATCH] powerpc: Add pgprot_writecombine

[Steve Wise]

On 03/14/2011 01:33 PM, Nishanth Aravamudan wrote:
> 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?:
>

Yes.

> 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<anton at 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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