Fix zero length sys_cacheflush
Cacheflush(0, 0, 0) was crashing the system. This is because
flush_icache_range(start, end) tries to flushing whole address space
(0 - ~0UL) if both start and end are zero.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index 611b48d..314701a 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -56,6 +56,8 @@
asmlinkage int sys_cacheflush(unsigned long __user addr,
unsigned long bytes, unsigned int cache)
{
+ if (bytes == 0)
+ return 0;
if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
return -EFAULT;