On Fri, 2020-10-02 at 08:01 +0100, Lee Jones wrote:
> On Thu, 01 Oct 2020, Michael Brunner wrote:
>
> > The Intel 0-DAY CI Kernel Test Service reports an unused variable
> > warning when compiling with clang for PowerPC:
> >
> > > > drivers/mfd/kempld-core.c:556:36: warning: unused variable
> > > > 'kempld_acpi_table' [-Wunused-const-variable]
> > static const struct acpi_device_id kempld_acpi_table[] = {
> >
> > The issue can be fixed by marking kempld_acpi_table as
> > __maybe_unused.
> >
> > Fixes: e8299c7313af ("[PATCH] mfd: Add ACPI support to Kontron PLD
> > driver")
> >
> > Reported-by: kernel test robot <l...@intel.com>
> > Signed-off-by: Michael Brunner <michael.brun...@kontron.com>
> > ---
> > drivers/mfd/kempld-core.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/mfd/kempld-core.c b/drivers/mfd/kempld-core.c
> > index 1dfe556df038..273481dfaad4 100644
> > --- a/drivers/mfd/kempld-core.c
> > +++ b/drivers/mfd/kempld-core.c
> > @@ -553,7 +553,7 @@ static int kempld_remove(struct platform_device
> > *pdev)
> > return 0;
> > }
> >
> > -static const struct acpi_device_id kempld_acpi_table[] = {
> > +static const struct acpi_device_id __maybe_unused
> > kempld_acpi_table[] = {
> > { "KEM0001", (kernel_ulong_t)&kempld_platform_data_generic },
> > {}
> > };
>
> This is not the right fix. Better just to compile it out completely
> in these circumstances. I already have a fix for this in soak.
Ok - thank you for the other fix you submitted!
But just out of curiosity - in process/coding-style.rst is written that
__maybe_unused should be preferred over wrapping in preprocessor
conditionals, if a function or variable may potentially go unused in a
particular configuration. So why is my patch not the right one here? At
least in my tests it seemed to solve the issue.
Thanks,
Michael
