X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-avr32%2Fcache.h;h=d3cf35ab11ab127854c90385554f743848bfe371;hb=bf22f6fe2d72b4d7e9035be8ceb340414cf490e3;hp=dabb955f3c00fd167dfca1671ea36f6257ba3371;hpb=ccaa36f73544163ef6e15eb29a620130755f6001;p=linux-2.6

diff --git a/include/asm-avr32/cache.h b/include/asm-avr32/cache.h
index dabb955f3c..d3cf35ab11 100644
--- a/include/asm-avr32/cache.h
+++ b/include/asm-avr32/cache.h
@@ -4,6 +4,15 @@
 #define L1_CACHE_SHIFT 5
 #define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
 
+/*
+ * Memory returned by kmalloc() may be used for DMA, so we must make
+ * sure that all such allocations are cache aligned. Otherwise,
+ * unrelated code may cause parts of the buffer to be read into the
+ * cache before the transfer is done, causing old data to be seen by
+ * the CPU.
+ */
+#define ARCH_KMALLOC_MINALIGN	L1_CACHE_BYTES
+
 #ifndef __ASSEMBLER__
 struct cache_info {
 	unsigned int ways;