From: Martin Schwidefsky <[email protected]>
[patch 13/14] s390: const pointer uaccess.
Using __typeof__(*ptr) on a pointer to const makes the __x
variable in __get_user const as well. The latest gcc will
refuse to write to it.
Signed-off-by: Martin Schwidefsky <[email protected]>
---
include/asm-s390/uaccess.h | 28 ++++++++++++++++++++++------
1 files changed, 22 insertions(+), 6 deletions(-)
diff -urpN linux-2.6/include/asm-s390/uaccess.h linux-2.6-patched/include/asm-s390/uaccess.h
--- linux-2.6/include/asm-s390/uaccess.h 2005-10-28 02:02:08.000000000 +0200
+++ linux-2.6-patched/include/asm-s390/uaccess.h 2005-10-28 14:04:55.000000000 +0200
@@ -200,21 +200,37 @@ extern int __put_user_bad(void) __attrib
#define __get_user(x, ptr) \
({ \
- __typeof__(*(ptr)) __x; \
int __gu_err; \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
- case 1: \
- case 2: \
- case 4: \
- case 8: \
+ case 1: { \
+ unsigned char __x; \
__get_user_asm(__x, ptr, __gu_err); \
+ (x) = (__typeof__(*(ptr))) __x; \
break; \
+ }; \
+ case 2: { \
+ unsigned short __x; \
+ __get_user_asm(__x, ptr, __gu_err); \
+ (x) = (__typeof__(*(ptr))) __x; \
+ break; \
+ }; \
+ case 4: { \
+ unsigned int __x; \
+ __get_user_asm(__x, ptr, __gu_err); \
+ (x) = (__typeof__(*(ptr))) __x; \
+ break; \
+ }; \
+ case 8: { \
+ unsigned long long __x; \
+ __get_user_asm(__x, ptr, __gu_err); \
+ (x) = (__typeof__(*(ptr))) __x; \
+ break; \
+ }; \
default: \
__get_user_bad(); \
break; \
} \
- (x) = __x; \
__gu_err; \
})
-
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