[PATCH] work around for more than 256MB memory support

[tiansm@lemote.com]

From: Fuxin Zhang <zhangfx@lemote.com>

Signed-off-by: Fuxin Zhang <zhangfx@lemote.com>
---
 drivers/char/mem.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index cc9a9d0..a19b46a 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -82,8 +82,12 @@ static inline int uncached_access(struct file *file, 
unsigned long addr)
         */
        if (file->f_flags & O_SYNC)
                return 1;
+#if defined(CONFIG_LEMOTE_FULONG) && defined(CONFIG_64BIT)
+       return (addr >= __pa(high_memory)) || ((addr >=0x10000000) && (addr < 
0x20000000));
+#else
        return addr >= __pa(high_memory);
 #endif
+#endif
 }
 
 #ifndef ARCH_HAS_VALID_PHYS_ADDR_RANGE
-- 
1.5.2.1