powerpc: Add pgprot_writecombine
authorAnton Blanchard <anton@samba.org>
Mon, 28 Feb 2011 20:00:47 +0000 (20:00 +0000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Wed, 2 Mar 2011 05:50:24 +0000 (16:50 +1100)
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>
arch/powerpc/include/asm/pgtable.h

index 89f1587..88b0bd9 100644 (file)
@@ -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,