From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Thu, 20 May 2010 03:21:38 +0000 (-0400)
Subject: Blackfin: set ARCH_KMALLOC_MINALIGN
X-Git-Tag: firefly_0821_release~10186^2~1513
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e4ea66658a37ca7f3142feecbaf3d2fd8a50cc50;p=firefly-linux-kernel-4.4.55.git

Blackfin: set ARCH_KMALLOC_MINALIGN

commit 76b99699a2bbf9efdb578f9a38a202af2ecb354b upstream.

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 <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/arch/blackfin/include/asm/cache.h b/arch/blackfin/include/asm/cache.h
index 8542bc31f63c..93f6c634fdf4 100644
--- a/arch/blackfin/include/asm/cache.h
+++ b/arch/blackfin/include/asm/cache.h
@@ -15,6 +15,8 @@
 #define L1_CACHE_BYTES	(1 << L1_CACHE_SHIFT)
 #define SMP_CACHE_BYTES	L1_CACHE_BYTES
 
+#define ARCH_KMALLOC_MINALIGN	L1_CACHE_BYTES
+
 #ifdef CONFIG_SMP
 #define __cacheline_aligned
 #else