linux-kernel - Re: [PATCH] scsi: ufs: qcom: Drop dead compile guard

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Message-ID: <e6e82d2-8ae3-d448-d28d-1e54ffabcdef@inria.fr>
Date: Tue, 5 Aug 2025 09:04:17 +0200 (CEST)
From: Julia Lawall <julia.lawall@...ia.fr>
To: Lukas Bulwahn <lukas.bulwahn@...il.com>
cc: Dan Carpenter <dan.carpenter@...aro.org>, 
    Konrad Dybcio <konradybcio@...nel.org>, kernel-janitors@...r.kernel.org, 
    Manivannan Sadhasivam <mani@...nel.org>, 
    "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>, 
    "Martin K. Petersen" <martin.petersen@...cle.com>, 
    Marijn Suijten <marijn.suijten@...ainline.org>, 
    linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org, 
    linux-kernel@...r.kernel.org, 
    Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH] scsi: ufs: qcom: Drop dead compile guard



On Tue, 5 Aug 2025, Lukas Bulwahn wrote:

> On Fri, Aug 1, 2025 at 5:33 PM Dan Carpenter <dan.carpenter@...aro.org> wrote:
> >
> > This patch removes some dead ifdeffed code because the KConfig has a
> > select which ensures that CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND is set.
> > Konrad was wondering if there are any tools to detect this sort of
> > thing.  I don't think so.  I think the only thing we detect are
> > non-existant configs.  But let me add a few more people to the CC who
> > might know.
> >
>
> I also have a simple script to search for unused configs, but that is
> just five lines of bash and then a lot of manual filtering.
>
> If I would attempt to implement such already rather complex analysis,
> I would start with looking at this tool:
>
> https://github.com/paulgazz/kmax
>
> Possibly, there is a good way to re-use some parts of it or extend it
> to look for the pattern above.

If there are ideas for improvement of kmax, I'm sure Paul would be happy
to hear about them.

julia

>
> Lukas
>
> > regards,
> > dan carpenter
> >
> > On Thu, Jul 24, 2025 at 02:23:52PM +0200, Konrad Dybcio wrote:
> > > From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> > >
> > > SCSI_UFSHCD already selects DEVFREQ_GOV_SIMPLE_ONDEMAND, drop the
> > > check.
> > >
> > > Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> > > ---
> > > Is this something that could be discovered by our existing static
> > > checkers?
> > > ---
> > >  drivers/ufs/host/ufs-qcom.c | 8 --------
> > >  1 file changed, 8 deletions(-)
> > >
> > > diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> > > index 4bbe4de1679b908c85e6a3d4035fc9dcafcc0d1a..76fc70503a62eb2e747b2d4cd18cc05b6f5526c7 100644
> > > --- a/drivers/ufs/host/ufs-qcom.c
> > > +++ b/drivers/ufs/host/ufs-qcom.c
> > > @@ -1898,7 +1898,6 @@ static int ufs_qcom_device_reset(struct ufs_hba *hba)
> > >       return 0;
> > >  }
> > >
> > > -#if IS_ENABLED(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND)
> > >  static void ufs_qcom_config_scaling_param(struct ufs_hba *hba,
> > >                                       struct devfreq_dev_profile *p,
> > >                                       struct devfreq_simple_ondemand_data *d)
> > > @@ -1910,13 +1909,6 @@ static void ufs_qcom_config_scaling_param(struct ufs_hba *hba,
> > >
> > >       hba->clk_scaling.suspend_on_no_request = true;
> > >  }
> > > -#else
> > > -static void ufs_qcom_config_scaling_param(struct ufs_hba *hba,
> > > -             struct devfreq_dev_profile *p,
> > > -             struct devfreq_simple_ondemand_data *data)
> > > -{
> > > -}
> > > -#endif
> > >
> > >  /* Resources */
> > >  static const struct ufshcd_res_info ufs_res_info[RES_MAX] = {
> > >
> > > ---
> > > base-commit: a933d3dc1968fcfb0ab72879ec304b1971ed1b9a
> > > change-id: 20250724-topic-ufs_compile_check-3378996f4221
> > >
> > > Best regards,
> > > --
> > > Konrad Dybcio <konrad.dybcio@....qualcomm.com>
>
>