diff options
Diffstat (limited to 'arch/arm/include/asm/uaccess.h')
| -rw-r--r-- | arch/arm/include/asm/uaccess.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h index 98c6b91be4a8..b5fdd30252f8 100644 --- a/arch/arm/include/asm/uaccess.h +++ b/arch/arm/include/asm/uaccess.h @@ -78,7 +78,11 @@ static inline void set_fs(mm_segment_t fs) #define segment_eq(a, b) ((a) == (b)) -/* We use 33-bit arithmetic here... */ +/* + * We use 33-bit arithmetic here. Success returns zero, failure returns + * addr_limit. We take advantage that addr_limit will be zero for KERNEL_DS, + * so this will always return success in that case. + */ #define __range_ok(addr, size) ({ \ unsigned long flag, roksum; \ __chk_user_ptr(addr); \ |