powerpc: Remove superfluous WARN_ON() from dma-noncoherent.c

I can't tell why this WARN_ON exists, and there's no comment
explaining it.  Whether the pmd is present or not, pte_alloc_kernel()
seems to handle both cases.

Booting a 440 kernel with 64K PAGE_SIZE triggers the warning, but boot
successfully completes and I see no problems beyond that.

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/lib/dma-noncoherent.c b/arch/powerpc/lib/dma-noncoherent.c
index 31734c0..2b1ce18 100644 (file)
--- a/arch/powerpc/lib/dma-noncoherent.c
+++ b/arch/powerpc/lib/dma-noncoherent.c
@@ -320,7 +320,6 @@ static int __init dma_alloc_init(void)
                        ret = -ENOMEM;
                        break;
                }
-               WARN_ON(!pmd_none(*pmd));
 
                pte = pte_alloc_kernel(pmd, CONSISTENT_BASE);
                if (!pte) {