cxgb4: use pgprot_writecombine() on powerpc
Commit fe3cc0d9 ("powerpc: Add pgprot_writecombine") in benh's tree exposes the pgprot_writecombine() API to drivers on powerpc. cxgb4 has an open-coded version of the same, so use the common API now that it's available. Signed-off-by: NNishanth Aravamudan <nacc@us.ibm.com> Cc: Steve Wise <swise@opengridcomputing.com> Cc: Anton Blanchard <anton@samba.org> Acked-by: NSteve Wise <swise@opengridcomputing.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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