Hello.
On 22-04-2013 10:41, Chen Gang wrote:
> need change ~(u8)0 to 0xff,
> or in mac802154_wpan_xmit(), "u8 chan" will never == MAC802154_CHAN_NONE
> find it by "make EXTRA_CFLAGS=-W"
> net/mac802154/wpan.c:325:2: warning: comparison is always false
> due to limited range of data type [-Wtype-limits]
> related unit test:
> cc -Wall -O2 -o test test.c
> ./test
> will output 'different'
> (after use '0xff' instead of '~(u8)0', it will output 'equal')
> -----------------------test code begin--------------------------------
> #include <stdio.h>
>
> typedef unsigned char u8;
>
> int main()
> {
> u8 uc = 0xff;
>
> if (uc == ~(u8)0)
> printf("\nequal\n");
> else
> printf("\ndifferent\n");
>
> return 0;
> }
> -----------------------test code end----------------------------------
> Signed-off-by: Chen Gang <gang.c...@asianux.com>
> ---
> net/mac802154/mac802154.h | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
> diff --git a/net/mac802154/mac802154.h b/net/mac802154/mac802154.h
> index 5c9e021..c59309f 100644
> --- a/net/mac802154/mac802154.h
> +++ b/net/mac802154/mac802154.h
> @@ -88,7 +88,7 @@ struct mac802154_sub_if_data {
>
> #define mac802154_to_priv(_hw) container_of(_hw, struct
> mac802154_priv, hw)
>
> -#define MAC802154_CHAN_NONE (~(u8)0) /* No channel is assigned */
> +#define MAC802154_CHAN_NONE (0xff) /* No channel is assigned */
() not needed now.
WBR, Sergei
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