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authorRalf Baechle <ralf@linux-mips.org>2009-04-27 15:31:34 +0200
committerRalf Baechle <ralf@linux-mips.org>2009-05-14 13:50:27 +0100
commitd0aab922b19aaaef13c946236cc71ab9b7f895ee (patch)
tree51ea4fa3c4f63771cd4673b3e7702e8af26134cb
parent1699e5c9c414f0e3b393eb87c4acfc319fe7a1c4 (diff)
MIPS: Make access_ok() sideeffect proof.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/include/asm/uaccess.h16
1 files changed, 13 insertions, 3 deletions
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h
index 09ff5bb17445..42b9cec2ee96 100644
--- a/arch/mips/include/asm/uaccess.h
+++ b/arch/mips/include/asm/uaccess.h
@@ -104,11 +104,21 @@
#define __access_mask get_fs().seg
-#define __access_ok(addr, size, mask) \
- (((signed long)((mask) & ((addr) | ((addr) + (size)) | __ua_size(size)))) == 0)
+#define __access_ok(addr, size, mask) \
+({ \
+ const volatile void __user *__up = addr; \
+ unsigned long __addr = (unsigned long) __up; \
+ unsigned long __size = size; \
+ unsigned long __mask = mask; \
+ unsigned long __ok; \
+ \
+ __ok = (signed long)(__mask & (__addr | (__addr + __size) | \
+ __ua_size(__size))); \
+ __ok == 0; \
+})
#define access_ok(type, addr, size) \
- likely(__access_ok((unsigned long)(addr), (size), __access_mask))
+ likely(__access_ok((addr), (size), __access_mask))
/*
* put_user: - Write a simple value into user space.