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| author | Michal Simek | 2010-04-26 13:49:01 +0200 |
|---|---|---|
| committer | Michal Simek | 2010-05-06 11:21:59 +0200 |
| commit | de925d9d3b64390ef6363e16e9d6a84d7dd7cee1 (patch) | |
| tree | 55b5418a6f9338be57590c13784a21ba6730246b /arch/microblaze/include/asm/page.h | |
| parent | microblaze: Fix typo fault in cache code (diff) | |
| download | kernel-qcow2-linux-de925d9d3b64390ef6363e16e9d6a84d7dd7cee1.tar.gz kernel-qcow2-linux-de925d9d3b64390ef6363e16e9d6a84d7dd7cee1.tar.xz kernel-qcow2-linux-de925d9d3b64390ef6363e16e9d6a84d7dd7cee1.zip | |
microblaze: Fix kmalloc alignment on non-coherent DMA platforms
Based on PowerPC patche 52142e756e9bf6485d3d53596e8aff2e816a7253
PowerPC description:
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: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/include/asm/page.h')
| -rw-r--r-- | arch/microblaze/include/asm/page.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/microblaze/include/asm/page.h b/arch/microblaze/include/asm/page.h index 9b12902b9818..de493f86d28f 100644 --- a/arch/microblaze/include/asm/page.h +++ b/arch/microblaze/include/asm/page.h @@ -31,6 +31,9 @@ #ifndef __ASSEMBLY__ +/* MS be sure that SLAB allocates aligned objects */ +#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES + #define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1))) #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1))) |