On Fri, 14 Aug 2020, Christian Lamparter wrote:
> On 2020-08-14 13:39, Lee Jones wrote:
> > 'ar9170_qmap' is used in some source files which include carl9170.h,
> > but not all of them. Mark it as __maybe_unused to show that this is
> > not only okay, it's expected.
> >
> > Fixes the following W=1 kernel build warning(s)
>
> Is this W=1 really a "must" requirement? I find it strange having
Clean W=1 warnings is the dream, yes.
I would have thought most Maintainers would be on-board with this.
The ones I've worked with thus far have certainly been thankful. Many
had this on their own TODO lists.
> __maybe_unused in header files as this "suggests" that the
> definition is redundant.
Not true.
If it were redundant then we would remove the line entirely.
> > from drivers/net/wireless/ath/carl9170/carl9170.h:57,
> > In file included from drivers/net/wireless/ath/carl9170/carl9170.h:57,
> > drivers/net/wireless/ath/carl9170/carl9170.h:71:17: warning: ‘ar9170_qmap’ defined but not used [-Wunused-const-variable=]
> >
> > Cc: Christian Lamparter <chunkeey@xxxxxxxxxxxxxx>
> > Cc: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
> > Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
> > Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
> > Cc: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
> > Cc: linux-wireless@xxxxxxxxxxxxxxx
> > Cc: netdev@xxxxxxxxxxxxxxx
> > Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
> > ---
> > drivers/net/wireless/ath/carl9170/carl9170.h | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/wireless/ath/carl9170/carl9170.h b/drivers/net/wireless/ath/carl9170/carl9170.h
> > index 237d0cda1bcb0..9d86253081bce 100644
> > --- a/drivers/net/wireless/ath/carl9170/carl9170.h
> > +++ b/drivers/net/wireless/ath/carl9170/carl9170.h
> > @@ -68,7 +68,7 @@
> > #define PAYLOAD_MAX (CARL9170_MAX_CMD_LEN / 4 - 1)
> > -static const u8 ar9170_qmap[__AR9170_NUM_TXQ] = { 3, 2, 1, 0 };
> > +static const u8 __maybe_unused ar9170_qmap[__AR9170_NUM_TXQ] = { 3, 2, 1, 0 };
> > #define CARL9170_MAX_RX_BUFFER_SIZE 8192
> >
>
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog
