[MIPS] Hook for platforms to define cachability of /dev/mem regions
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index abf99b1..81f925a 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -6,6 +6,8 @@
* Copyright (C) 1994 - 2003, 07 by Ralf Baechle (ralf@linux-mips.org)
* Copyright (C) 2007 MIPS Technologies, Inc.
*/
+#include <linux/fs.h>
+#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -164,3 +166,11 @@
panic(cache_panic);
}
+
+int __weak __uncached_access(struct file *file, unsigned long addr)
+{
+ if (file->f_flags & O_SYNC)
+ return 1;
+
+ return addr >= __pa(high_memory);
+}