Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753754Ab0F2Hnv (ORCPT ); Tue, 29 Jun 2010 03:43:51 -0400 Received: from sh.osrg.net ([192.16.179.4]:48233 "EHLO sh.osrg.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753337Ab0F2Hnu (ORCPT ); Tue, 29 Jun 2010 03:43:50 -0400 Date: Tue, 29 Jun 2010 16:43:45 +0900 To: cmetcalf@tilera.com Cc: linux-kernel@vger.kernel.org Subject: [PATCH -next] tile: set ARCH_KMALLOC_MINALIGN From: FUJITA Tomonori Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-Id: <20100629164117Z.fujita.tomonori@lab.ntt.co.jp> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0 (sh.osrg.net [192.16.179.4]); Tue, 29 Jun 2010 16:43:45 +0900 (JST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1360 Lines: 32 The minimum alignment and width of DMA is L2_CACHE_BYTES (because your dma_get_cache_alignment() returns L2_CACHE_BYTES), right? = From: FUJITA Tomonori Subject: [PATCH -next] tile: set ARCH_KMALLOC_MINALIGN Architectures that handle DMA-non-coherent memory need to set ARCH_KMALLOC_MINALIGN to make sure that kmalloc'ed buffer is DMA-safe: the buffer doesn't share a cache with the others. Signed-off-by: FUJITA Tomonori --- arch/tile/include/asm/cache.h | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/arch/tile/include/asm/cache.h b/arch/tile/include/asm/cache.h index ee59714..e08d9e8 100644 --- a/arch/tile/include/asm/cache.h +++ b/arch/tile/include/asm/cache.h @@ -31,6 +31,8 @@ #define L2_CACHE_BYTES (1 << L2_CACHE_SHIFT) #define L2_CACHE_ALIGN(x) (((x)+(L2_CACHE_BYTES-1)) & -L2_CACHE_BYTES) +#define ARCH_KMALLOC_MINALIGN L2_CACHE_BYTES + /* use the cache line size for the L2, which is where it counts */ #define SMP_CACHE_BYTES_SHIFT L2_CACHE_SHIFT #define SMP_CACHE_BYTES L2_CACHE_BYTES -- 1.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/