| Message ID | 20201208155540.340583-1-adrian.ratiu@collabora.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | media: rkvdec: silence ktest bot build warning | expand |
On 08/12/2020 16:55, Adrian Ratiu wrote: > Some configurations built by the ktest bot produce the following > warn, so mark the struct as __maybe_unused to avoid unnecessary > ML spam. > >>> drivers/staging/media/rkvdec/rkvdec.c:967:34: warning: unused variable 'of_rkvdec_match' [-Wunused-const-variable] > static const struct of_device_id of_rkvdec_match[] = { > ^ > 1 warning generated. I suspect that this is because there is no 'depends on OF' in the Kconfig. '__maybe_unused' isn't used for this anywhere else, so this does not seem like the right approach. Regards, Hans > > vim +/of_rkvdec_match +967 drivers/staging/media/rkvdec/rkvdec.c > > 966 > > 967 static const struct of_device_id of_rkvdec_match[] = { > 968 { .compatible = "rockchip,rk3399-vdec" }, > 969 { /* sentinel */ } > 970 }; > 971 MODULE_DEVICE_TABLE(of, of_rkvdec_match); > 972 > > Cc: Boris Brezillon <boris.brezillon@collabora.com> > Cc: Ezequiel Garcia <ezequiel@collabora.com> > Cc: Mauro Carvalho Chehab <mchehab@kernel.org> > Reported-by: kernel test robot <lkp@intel.com> > Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com> > --- > drivers/staging/media/rkvdec/rkvdec.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c > index aa4f8c287618..3af0f02ec59b 100644 > --- a/drivers/staging/media/rkvdec/rkvdec.c > +++ b/drivers/staging/media/rkvdec/rkvdec.c > @@ -992,7 +992,7 @@ static void rkvdec_watchdog_func(struct work_struct *work) > } > } > > -static const struct of_device_id of_rkvdec_match[] = { > +static const struct of_device_id __maybe_unused of_rkvdec_match[] = { > { .compatible = "rockchip,rk3399-vdec" }, > { /* sentinel */ } > }; >
On Thu, 7 Jan 2021 10:13:43 +0100 Hans Verkuil <hverkuil@xs4all.nl> wrote: > On 08/12/2020 16:55, Adrian Ratiu wrote: > > Some configurations built by the ktest bot produce the following > > warn, so mark the struct as __maybe_unused to avoid unnecessary > > ML spam. > > > >>> drivers/staging/media/rkvdec/rkvdec.c:967:34: warning: unused variable 'of_rkvdec_match' [-Wunused-const-variable] > > static const struct of_device_id of_rkvdec_match[] = { > > ^ > > 1 warning generated. > > I suspect that this is because there is no 'depends on OF' in the Kconfig. > > '__maybe_unused' isn't used for this anywhere else, so this does not seem like the > right approach. It's not uncommon to do that, especially when you want the driver to be compile-tested (`git grep -C2 __maybe_unused|grep of_device_id` even reports 2 drivers in the media tree :P). A `depends on OF` or an `#ifdef CONFIG_OF` section surrounding the of_rkvdec_match declaration would also do the trick. > > Regards, > > Hans > > > > > vim +/of_rkvdec_match +967 drivers/staging/media/rkvdec/rkvdec.c > > > > 966 > > > 967 static const struct of_device_id of_rkvdec_match[] = { > > 968 { .compatible = "rockchip,rk3399-vdec" }, > > 969 { /* sentinel */ } > > 970 }; > > 971 MODULE_DEVICE_TABLE(of, of_rkvdec_match); > > 972 > > > > Cc: Boris Brezillon <boris.brezillon@collabora.com> > > Cc: Ezequiel Garcia <ezequiel@collabora.com> > > Cc: Mauro Carvalho Chehab <mchehab@kernel.org> > > Reported-by: kernel test robot <lkp@intel.com> > > Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com> > > --- > > drivers/staging/media/rkvdec/rkvdec.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c > > index aa4f8c287618..3af0f02ec59b 100644 > > --- a/drivers/staging/media/rkvdec/rkvdec.c > > +++ b/drivers/staging/media/rkvdec/rkvdec.c > > @@ -992,7 +992,7 @@ static void rkvdec_watchdog_func(struct work_struct *work) > > } > > } > > > > -static const struct of_device_id of_rkvdec_match[] = { > > +static const struct of_device_id __maybe_unused of_rkvdec_match[] = { > > { .compatible = "rockchip,rk3399-vdec" }, > > { /* sentinel */ } > > }; > > >
On Thu, 2021-01-07 at 12:41 +0100, Boris Brezillon wrote: > On Thu, 7 Jan 2021 10:13:43 +0100 > Hans Verkuil <hverkuil@xs4all.nl> wrote: > > > On 08/12/2020 16:55, Adrian Ratiu wrote: > > > Some configurations built by the ktest bot produce the following > > > warn, so mark the struct as __maybe_unused to avoid unnecessary > > > ML spam. > > > > > > > > drivers/staging/media/rkvdec/rkvdec.c:967:34: warning: unused variable 'of_rkvdec_match' [-Wunused-const-variable] > > > static const struct of_device_id of_rkvdec_match[] = { > > > ^ > > > 1 warning generated. > > > > I suspect that this is because there is no 'depends on OF' in the Kconfig. > > > > '__maybe_unused' isn't used for this anywhere else, so this does not seem like the > > right approach. > > It's not uncommon to do that, especially when you want the driver to be > compile-tested (`git grep -C2 __maybe_unused|grep of_device_id` even > reports 2 drivers in the media tree :P). A `depends on OF` or an > `#ifdef CONFIG_OF` section surrounding the of_rkvdec_match declaration > would also do the trick. > I'm fine either way, __maybe_unused or depends on OF. Thanks, Ezequiel
diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c index aa4f8c287618..3af0f02ec59b 100644 --- a/drivers/staging/media/rkvdec/rkvdec.c +++ b/drivers/staging/media/rkvdec/rkvdec.c @@ -992,7 +992,7 @@ static void rkvdec_watchdog_func(struct work_struct *work) } } -static const struct of_device_id of_rkvdec_match[] = { +static const struct of_device_id __maybe_unused of_rkvdec_match[] = { { .compatible = "rockchip,rk3399-vdec" }, { /* sentinel */ } };