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powerpc: Add pgprot_writecombine

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A number of drivers are using pgprot_writecombine() to enable write
combining on userspace mappings. Implement it on powerpc.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2011-02-28 20:00:47 +00:00 committed by Benjamin Herrenschmidt
parent a9d8946b4a
commit fe3cc0d99d
1 changed files with 1 additions and 0 deletions
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arch/powerpc/include/asm/pgtable.h
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@ -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,