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From: Deepak R Varma <mh12gx2825@gmail.com>
To: Eric Anholt <eric@anholt.net>
Cc: David Airlie <airlied@linux.ie>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Maxime Ripard <maxime@cerno.tech>
Subject: Re: [PATCH] drm/vc4: replace idr_init() by idr_init_base()
Date: Fri, 6 Nov 2020 01:03:12 +0530	[thread overview]
Message-ID: <20201105193312.GA108505@localhost> (raw)
In-Reply-To: <CADaigPWV+x=6x_vso1Eb7ZEdmevpjgdGWO-epq-S6gJ3J1-sSA@mail.gmail.com>

On Thu, Nov 05, 2020 at 11:25:11AM -0800, Eric Anholt wrote:
> On Thu, Nov 5, 2020 at 10:25 AM Deepak R Varma <mh12gx2825@gmail.com> wrote:
> >
> > idr_init() uses base 0 which is an invalid identifier for this driver.
> > The idr_alloc for this driver uses VC4_PERFMONID_MIN as start value for
> > ID range and it is #defined to 1. The new function idr_init_base allows
> > IDR to set the ID lookup from base 1. This avoids all lookups that
> > otherwise starts from 0 since 0 is always unused / available.
> >
> > References: commit 6ce711f27500 ("idr: Make 1-based IDRs more efficient")
> >
> > Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
> > ---
> >  drivers/gpu/drm/vc4/vc4_perfmon.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/vc4/vc4_perfmon.c b/drivers/gpu/drm/vc4/vc4_perfmon.c
> > index f4aa75efd16b..7d40f421d922 100644
> > --- a/drivers/gpu/drm/vc4/vc4_perfmon.c
> > +++ b/drivers/gpu/drm/vc4/vc4_perfmon.c
> > @@ -77,7 +77,7 @@ struct vc4_perfmon *vc4_perfmon_find(struct vc4_file *vc4file, int id)
> >  void vc4_perfmon_open_file(struct vc4_file *vc4file)
> >  {
> >         mutex_init(&vc4file->perfmon.lock);
> > -       idr_init(&vc4file->perfmon.idr);
> > +       idr_init_base(&vc4file->perfmon.idr, 1);
> >  }
> 
> Sounds like you should use VC4_PERFMONID_MIN instead of a magic 1 here.

Agreed. I will update and resend v2.

Thank you,
./drv
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WARNING: multiple messages have this Message-ID (diff)
From: Deepak R Varma <mh12gx2825@gmail.com>
To: Eric Anholt <eric@anholt.net>
Cc: David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Maxime Ripard <maxime@cerno.tech>,
	Maxime Ripard <mripard@kernel.org>
Subject: Re: [PATCH] drm/vc4: replace idr_init() by idr_init_base()
Date: Fri, 6 Nov 2020 01:03:12 +0530	[thread overview]
Message-ID: <20201105193312.GA108505@localhost> (raw)
In-Reply-To: <CADaigPWV+x=6x_vso1Eb7ZEdmevpjgdGWO-epq-S6gJ3J1-sSA@mail.gmail.com>

On Thu, Nov 05, 2020 at 11:25:11AM -0800, Eric Anholt wrote:
> On Thu, Nov 5, 2020 at 10:25 AM Deepak R Varma <mh12gx2825@gmail.com> wrote:
> >
> > idr_init() uses base 0 which is an invalid identifier for this driver.
> > The idr_alloc for this driver uses VC4_PERFMONID_MIN as start value for
> > ID range and it is #defined to 1. The new function idr_init_base allows
> > IDR to set the ID lookup from base 1. This avoids all lookups that
> > otherwise starts from 0 since 0 is always unused / available.
> >
> > References: commit 6ce711f27500 ("idr: Make 1-based IDRs more efficient")
> >
> > Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
> > ---
> >  drivers/gpu/drm/vc4/vc4_perfmon.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/vc4/vc4_perfmon.c b/drivers/gpu/drm/vc4/vc4_perfmon.c
> > index f4aa75efd16b..7d40f421d922 100644
> > --- a/drivers/gpu/drm/vc4/vc4_perfmon.c
> > +++ b/drivers/gpu/drm/vc4/vc4_perfmon.c
> > @@ -77,7 +77,7 @@ struct vc4_perfmon *vc4_perfmon_find(struct vc4_file *vc4file, int id)
> >  void vc4_perfmon_open_file(struct vc4_file *vc4file)
> >  {
> >         mutex_init(&vc4file->perfmon.lock);
> > -       idr_init(&vc4file->perfmon.idr);
> > +       idr_init_base(&vc4file->perfmon.idr, 1);
> >  }
> 
> Sounds like you should use VC4_PERFMONID_MIN instead of a magic 1 here.

Agreed. I will update and resend v2.

Thank you,
./drv

  reply	other threads:[~2020-11-06  8:36 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-05 18:16 [PATCH] drm/vc4: replace idr_init() by idr_init_base() Deepak R Varma
2020-11-05 18:16 ` Deepak R Varma
2020-11-05 19:25 ` Eric Anholt
2020-11-05 19:25   ` Eric Anholt
2020-11-05 19:33   ` Deepak R Varma [this message]
2020-11-05 19:33     ` Deepak R Varma

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