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tile: enable sparse checks for get/put_user 

Add an extra intermediate variable to __get_user and __put_user
to give sparse an opportunity to detect mismatches.

Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
This commit is contained in:
Chris Metcalf 2015-01-13 14:41:20 -05:00
parent f3c927125f
commit b9f705758a
1 changed files with 11 additions and 8 deletions
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19
arch/tile/include/asm/uaccess.h
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@ -210,14 +210,16 @@ extern int __get_user_bad(void)
#define __get_user(x, ptr) \
({ \
int __ret; \
typeof(x) _x; \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: __get_user_1(x, ptr, __ret); break; \
case 2: __get_user_2(x, ptr, __ret); break; \
case 4: __get_user_4(x, ptr, __ret); break; \
case 8: __get_user_8(x, ptr, __ret); break; \
case 1: __get_user_1(_x, ptr, __ret); break; \
case 2: __get_user_2(_x, ptr, __ret); break; \
case 4: __get_user_4(_x, ptr, __ret); break; \
case 8: __get_user_8(_x, ptr, __ret); break; \
default: __ret = __get_user_bad(); break; \
} \
(x) = (typeof(*(ptr))) _x; \
__ret; \
})
@ -289,12 +291,13 @@ extern int __put_user_bad(void)
#define __put_user(x, ptr) \
({ \
int __ret; \
typeof(*(ptr)) _x = (x); \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: __put_user_1(x, ptr, __ret); break; \
case 2: __put_user_2(x, ptr, __ret); break; \
case 4: __put_user_4(x, ptr, __ret); break; \
case 8: __put_user_8(x, ptr, __ret); break; \
case 1: __put_user_1(_x, ptr, __ret); break; \
case 2: __put_user_2(_x, ptr, __ret); break; \
case 4: __put_user_4(_x, ptr, __ret); break; \
case 8: __put_user_8(_x, ptr, __ret); break; \
default: __ret = __put_user_bad(); break; \
} \
__ret; \