Messages in this thread | | | From | FUJITA Tomonori <> | Subject | [PATCH -mm 0/6] ARCH_KMALLOC_MINALIGN fixes | Date | Thu, 20 May 2010 12:21:37 +0900 |
| |
As DMA-API-HOWTO says, kmalloc'ed buffer must be DMA-safe. Drivers and subsystems depend on it.
So architectures that handle DMA-non-coherent memory need to set ARCH_KMALLOC_MINALIGN: the kmalloc'ed buffer doesn't share a cache with the others. Otherwise, we hit memory corruption due to DMA.
I had a quick look at all the architectures. Seems that some architectures that need to set ARCH_KMALLOC_MINALIGN don't do.
= arch/blackfin/include/asm/cache.h | 2 ++ arch/frv/include/asm/cache.h | 2 ++ arch/m68k/include/asm/cache.h | 2 ++ arch/mn10300/include/asm/cache.h | 2 ++ arch/parisc/include/asm/cache.h | 2 ++ arch/xtensa/include/asm/cache.h | 1 + 6 files changed, 11 insertions(+), 0 deletions(-)
| |