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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2007-11-19 19:25:06 +1100
committerPaul Mackerras <paulus@samba.org>2007-11-20 11:37:43 +1100
commit52142e756e9bf6485d3d53596e8aff2e816a7253 (patch)
tree63ce9329dad3cefae84fec67535500f1f23d52e3 /include
parentf9b6c1de697f07dd0fb1c79bb3a6a8aa302f7476 (diff)
[POWERPC] Fix kmalloc alignment on non-coherent DMA platforms
On platforms doing non-coherent DMA (4xx, 8xx, ...), it's important that the kmalloc minimum alignment is set to the cache line size, to avoid sharing cache lines between different objects, so that DMA to one of the objects doesn't corrupt the other. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-powerpc/page_32.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/asm-powerpc/page_32.h b/include/asm-powerpc/page_32.h
index 374d0db37e1..17110aff26e 100644
--- a/include/asm-powerpc/page_32.h
+++ b/include/asm-powerpc/page_32.h
@@ -6,6 +6,10 @@
#define PPC_MEMSTART 0
+#ifdef CONFIG_NOT_COHERENT_CACHE
+#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
+#endif
+
#ifndef __ASSEMBLY__
/*
* The basic type of a PTE - 64 bits for those CPUs with > 32 bit