From 574b9d91e6b60bb1cd09abc1d76de757b5450e6d Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 20 Oct 2005 22:55:26 +0100
Subject: [PATCH] --- yaml --- r: 11286 b: refs/heads/master c:
 e5adb8770e12169a6595a3ad5682541441bd1052 h: refs/heads/master v: v3

---
 [refs]                       |  2 +-
 trunk/arch/mips/lib/memcpy.S | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 0bd0f5e4d5b6..7283ffee4e44 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7cf8053b8ee48a7f0e9d8ebc72c279fb2e168c25
+refs/heads/master: e5adb8770e12169a6595a3ad5682541441bd1052
diff --git a/trunk/arch/mips/lib/memcpy.S b/trunk/arch/mips/lib/memcpy.S
index a78865f76547..7f9aafa4d80e 100644
--- a/trunk/arch/mips/lib/memcpy.S
+++ b/trunk/arch/mips/lib/memcpy.S
@@ -13,6 +13,21 @@
  * 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>