On Thu, 2017-04-06 at 16:54 -0700, Matthias Kaehlcke wrote: > Hi Joe, > > El Thu, Apr 06, 2017 at 02:29:20PM -0700 Joe Perches ha dit: > > > On Thu, 2017-04-06 at 14:21 -0700, Matthias Kaehlcke wrote: > > > The macro results are assigned to u8 variables/fields. Adding the cast > > > fixes plenty of clang warnings about "implicit conversion from 'int' to > > > 'u8'". > > > > > > Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx> > > > --- > > > drivers/net/wireless/ath/ath9k/eeprom.h | 2 +- > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > diff --git a/drivers/net/wireless/ath/ath9k/eeprom.h b/drivers/net/wireless/ath/ath9k/eeprom.h > > > index 30bf722e33ed..31390af6c33e 100644 > > > --- a/drivers/net/wireless/ath/ath9k/eeprom.h > > > +++ b/drivers/net/wireless/ath/ath9k/eeprom.h > > > @@ -106,7 +106,7 @@ > > > #define AR9285_RDEXT_DEFAULT 0x1F > > > > > > #define ATH9K_POW_SM(_r, _s) (((_r) & 0x3f) << (_s)) > > > -#define FREQ2FBIN(x, y) ((y) ? ((x) - 2300) : (((x) - 4800) / 5)) > > > +#define FREQ2FBIN(x, y) (u8)((y) ? ((x) - 2300) : (((x) - 4800) / 5)) > > > > Maybe better to use: > > > > static inline u8 FREQ2FBIN(int x, int y) > > { > > if (y) > > return x - 2300; > > return (x - 4800) / 5; > > } > > Thanks for your suggestion! Unfortunately in this case an inline > function is not suitable since FREQ2FBIN() is mostly used for > structure initialization: > > static const struct ar9300_eeprom ar9300_default = { > ... > .calFreqPier2G = { > FREQ2FBIN(2412, 1), > FREQ2FBIN(2437, 1), > FREQ2FBIN(2472, 1) > }, > ... Maybe it's better to remove the second argument and write something like: #define FREQ2FBIN(x) \ (u8)(((x) >= 2300 && (x) <= 2555) ? (x) - 2300 : \ ((x) >= 4800 && (x) <= 4800 + (256 * 5) ? ((x) - 4800) / 5) : \ __builtin_const_p(x) ? BUILD_BUG_ON(1) : 0)