[PATCH 7/8] drm/msmi: annotate pll_cmp_to_fdata() with __maybe_unused

[Dmitry Baryshkov]

On Wed, Sep 11, 2024 at 01:23:23PM GMT, Jani Nikula wrote:
> On Tue, 10 Sep 2024, Marc Gonzalez <mgonzalez at freebox.fr> wrote:
> > On 10/09/2024 16:51, Dmitry Baryshkov wrote:
> >
> >> On Tue, Sep 10, 2024 at 01:03:43PM GMT, Jani Nikula wrote:
> >>
> >>> Building with clang and and W=1 leads to warning about unused
> >>> pll_cmp_to_fdata(). Fix by annotating it with __maybe_unused.
> >>>
> >>> See also commit 6863f5643dd7 ("kbuild: allow Clang to find unused static
> >>> inline functions for W=1 build").
> >>>
> >>> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> >> 
> >> I think this function can be dropped. Marc, your call, as an author of
> >> the patch?
> >
> > ( Why is the patch prefixed "drm/msmi", is "msmi" a typo? )
> 
> Whoops, a typo.
> 
> >
> > -> For the record, Arnaud is the driver's author.
> >
> > pll_cmp_to_fdata() was used in hdmi_8998_pll_recalc_rate()
> > in a commented code block which was later removed.
> >
> > Thus, yes, it is safe to completely delete the unused function.
> > I'm surprised gcc didn't catch that...
> 
> Thanks, I'll change this to drop the function.

Seeing no updated revisions here, I've posted a patch that drops the
offending function. If I missed an update, please exuse me.

> 
> GCC doesn't catch unused static inlines, while Clang does.
> 
> BR,
> Jani.
> 
> 
> >
> > Regards
> >
> >
> >>> ---
> >>>  drivers/gpu/drm/msm/hdmi/hdmi_phy_8998.c | 2 +-
> >>>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>>
> >>> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_phy_8998.c b/drivers/gpu/drm/msm/hdmi/hdmi_phy_8998.c
> >>> index 0e3a2b16a2ce..c0bf1f35539e 100644
> >>> --- a/drivers/gpu/drm/msm/hdmi/hdmi_phy_8998.c
> >>> +++ b/drivers/gpu/drm/msm/hdmi/hdmi_phy_8998.c
> >>> @@ -153,7 +153,7 @@ static inline u32 pll_get_pll_cmp(u64 fdata, unsigned long ref_clk)
> >>>  	return dividend - 1;
> >>>  }
> >>>  
> >>> -static inline u64 pll_cmp_to_fdata(u32 pll_cmp, unsigned long ref_clk)
> >>> +static inline __maybe_unused u64 pll_cmp_to_fdata(u32 pll_cmp, unsigned long ref_clk)
> >>>  {
> >>>  	u64 fdata = ((u64)pll_cmp) * ref_clk * 10;
> >>>  
> >>> -- 
> >>> 2.39.2
> >
> >
> 
> -- 
> Jani Nikula, Intel

-- 
With best wishes
Dmitry