Commit 52142e75 authored Nov 19, 2007 by Benjamin Herrenschmidt Committed by Paul Mackerras Nov 20, 2007

[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>

parent f9b6c1de

include/asm-powerpc/page_32.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -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