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s390/uaccess: fix access_ok compile warnings 

On s390 access_ok is a macro which discards all parameters and always
returns 1. This can result in compile warnings which warn about unused
variables like this:

fs/read_write.c: In function 'rw_copy_check_uvector':
fs/read_write.c:684:16: warning: unused variable 'buf' [-Wunused-variable]

Fix this by adding a __range_ok() function which consumes all parameters
but still always returns 1.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2012-05-29 07:33:59 +02:00 committed by Martin Schwidefsky
parent 2e30db9522
commit 491af9903b
1 changed files with 9 additions and 4 deletions
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13
arch/s390/include/asm/uaccess.h
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@ -50,10 +50,15 @@
#define segment_eq(a,b) ((a).ar4 == (b).ar4)
#define __access_ok(addr, size) \
({ \
__chk_user_ptr(addr); \
1; \
static inline int __range_ok(unsigned long addr, unsigned long size)
{
return 1;
}
#define __access_ok(addr, size) \
({ \
__chk_user_ptr(addr); \
__range_ok((unsigned long)(addr), (size)); \
})
#define access_ok(type, addr, size) __access_ok(addr, size)