ARM: warnings in arch/arm/include/asm/uaccess.h

On NOMMU ARM, the __addr_ok() and __range_ok() macros do not evaluate
their arguments, which may lead to harmless build warnings in some
code where the variables are not used otherwise. Adding a cast to void
gets rid of the warning and does not make any semantic changes.

Without this patch, building at91x40_defconfig results in:

fs/read_write.c: In function 'rw_copy_check_uvector':
fs/read_write.c:684:9: warning: unused variable 'buf' [-Wunused-variable]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index 77bd79f2ffdbd0344d096ca7fb2db809fb52d387..7e1f76027f666e252c35bd320d4518e110548c47 100644 (file)
--- a/arch/arm/include/asm/uaccess.h
+++ b/arch/arm/include/asm/uaccess.h
@@ -200,8 +200,8 @@ extern int __put_user_8(void *, unsigned long long);
 #define USER_DS                        KERNEL_DS
 
 #define segment_eq(a,b)                (1)
-#define __addr_ok(addr)                (1)
-#define __range_ok(addr,size)  (0)
+#define __addr_ok(addr)                ((void)(addr),1)
+#define __range_ok(addr,size)  ((void)(addr),0)
 #define get_fs()               (KERNEL_DS)
 
 static inline void set_fs(mm_segment_t fs)