diff options
| -rw-r--r-- | arch/s390/include/asm/uaccess.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h index 333a2afc0d6f..b5712d690a93 100644 --- a/arch/s390/include/asm/uaccess.h +++ b/arch/s390/include/asm/uaccess.h @@ -49,6 +49,8 @@ raw_copy_from_user(void *to, const void __user *from, unsigned long size) : CC_OUT(cc, cc), [size] "+d" (size), [to] "=Q" (*(char *)to) : [spec] "I" (0x81), [from] "Q" (*(const char __user *)from) : CC_CLOBBER_LIST("memory", "0")); + if (__builtin_constant_p(osize) && osize <= 4096) + return osize - size; if (likely(CC_TRANSFORM(cc) == 0)) return osize - size; size -= 4096; @@ -75,6 +77,8 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long size) : CC_OUT(cc, cc), [size] "+d" (size), [to] "=Q" (*(char __user *)to) : [spec] "I" (0x81), [from] "Q" (*(const char *)from) : CC_CLOBBER_LIST("memory", "0")); + if (__builtin_constant_p(osize) && osize <= 4096) + return osize - size; if (likely(CC_TRANSFORM(cc) == 0)) return osize - size; size -= 4096; |