On 06/10/12 00:55, Arnd Bergmann wrote:
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 <[email protected]>
Cc: Greg Ungerer <[email protected]>
Cc: Russell King <[email protected]>
Acked-by: Greg Ungerer <[email protected]>
I can pick it up and push to the arm-soc tree.
Regards
Greg
---
arch/arm/include/asm/uaccess.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index 77bd79f..7e1f760 100644
--- 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)
--
------------------------------------------------------------------------
Greg Ungerer -- Principal Engineer EMAIL: [email protected]
SnapGear Group, McAfee PHONE: +61 7 3435 2888
8 Gardner Close FAX: +61 7 3217 5323
Milton, QLD, 4064, Australia WEB: http://www.SnapGear.com
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