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491af9903b
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>