diff options
Diffstat (limited to 'arch/alpha/include')
| -rw-r--r-- | arch/alpha/include/asm/uaccess.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/alpha/include/asm/uaccess.h b/arch/alpha/include/asm/uaccess.h index e69c4e13c328..cf4ac791a592 100644 --- a/arch/alpha/include/asm/uaccess.h +++ b/arch/alpha/include/asm/uaccess.h @@ -30,11 +30,13 @@ * Address valid if: * - "addr" doesn't have any high-bits set * - AND "size" doesn't have any high-bits set - * - AND "addr+size" doesn't have any high-bits set + * - AND "addr+size-(size != 0)" doesn't have any high-bits set * - OR we are in kernel mode. */ -#define __access_ok(addr, size) \ - ((get_fs().seg & (addr | size | (addr+size))) == 0) +#define __access_ok(addr, size) ({ \ + unsigned long __ao_a = (addr), __ao_b = (size); \ + unsigned long __ao_end = __ao_a + __ao_b - !!__ao_b; \ + (get_fs().seg & (__ao_a | __ao_b | __ao_end)) == 0; }) #define access_ok(addr, size) \ ({ \ |