[PATCH v3 11/13] crypto: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC_MINALIGN

[Catalin Marinas]

ARCH_DMA_MINALIGN represents the minimum (static) alignment for safe DMA
operations while ARCH_KMALLOC_MINALIGN is the minimum kmalloc()
alignment. This will ensure that the static alignment of various
structures or members of those structures( e.g. __ctx[] in struct
aead_request) is safe for DMA. Note that sizeof such structures becomes
aligned to ARCH_DMA_MINALIGN and kmalloc() will honour such alignment,
so there is no confusion for the compiler.

Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
Cc: Herbert Xu <herbert at gondor.apana.org.au>
Cc: Ard Biesheuvel <ardb at kernel.org>
---

I know Herbert NAK'ed this patch but I'm still keeping it here
temporarily, until we agree on some refactoring at the crypto code. FTR,
I don't think there's anything wrong with this patch since kmalloc()
will return ARCH_DMA_MINALIGN-aligned objects if the sizeof such objects
is a multiple of ARCH_DMA_MINALIGN (side-effect of
CRYPTO_MINALIGN_ATTR).

 include/linux/crypto.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 2324ab6f1846..654b9c355575 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -167,7 +167,7 @@
  * maintenance for non-coherent DMA (cache invalidation in particular) does not
  * affect data that may be accessed by the CPU concurrently.
  */
-#define CRYPTO_MINALIGN ARCH_KMALLOC_MINALIGN
+#define CRYPTO_MINALIGN ARCH_DMA_MINALIGN
 
 #define CRYPTO_MINALIGN_ATTR __attribute__ ((__aligned__(CRYPTO_MINALIGN)))