X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=arch%2Fmips%2Flib%2Fmemcpy.S;h=a526c62cb76a90626d6461b31be1000f2858af38;hb=c0bc8721b8d0380ec69fa97578c91201201b05a9;hp=a78865f76547848d3cc1a1b495e6a6360dfc79ff;hpb=abf914208a1e120446ea4f9bc26406bd3a4579e1;p=linux-2.6-omap-h63xx.git

diff --git a/arch/mips/lib/memcpy.S b/arch/mips/lib/memcpy.S
index a78865f7654..a526c62cb76 100644
--- a/arch/mips/lib/memcpy.S
+++ b/arch/mips/lib/memcpy.S
@@ -12,7 +12,21 @@
  *
  * Mnemonic names for arguments to memcpy/__copy_user
  */
-#include <linux/config.h>
+
+/*
+ * Hack to resolve longstanding prefetch issue
+ *
+ * Prefetching may be fatal on some systems if we're prefetching beyond the
+ * end of memory on some systems.  It's also a seriously bad idea on non
+ * dma-coherent systems.
+ */
+#if !defined(CONFIG_DMA_COHERENT) || !defined(CONFIG_DMA_IP27)
+#undef CONFIG_CPU_HAS_PREFETCH
+#endif
+#ifdef CONFIG_MIPS_MALTA
+#undef CONFIG_CPU_HAS_PREFETCH
+#endif
+
 #include <asm/asm.h>
 #include <asm/asm-offsets.h>
 #include <asm/regdef.h>