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<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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