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Date:      Tue, 21 Jun 2022 23:34:21 -0600
From:      Warner Losh <imp@bsdimp.com>
To:        Steve Kargl <sgk@troutmask.apl.washington.edu>
Cc:        Stefan Blachmann <sblachmann@gmail.com>, Emmanuel Vadot <manu@bidouilliste.com>,  Ed Maste <emaste@freebsd.org>, Poul-Henning Kamp <phk@phk.freebsd.dk>,  FreeBSD Hackers <freebsd-hackers@freebsd.org>
Subject:   Re: Reasons for keeping sc(4) and libvgl ?
Message-ID:  <CANCZdfraihrmoHsu85aFWUT3zwTO%2B-x_Jbcdk0f%2Bxrr7kMxckg@mail.gmail.com>
In-Reply-To: <YrKhlZnlF%2ByxZd9X@troutmask.apl.washington.edu>
References:  <20211126160454.3eb827365a02103169ab9adc@bidouilliste.com> <20220621201924.e9b96876c947140ac1f3b7a4@bidouilliste.com> <3d09c86a-9840-f8bf-4725-8098d958a01d@plan-b.pwste.edu.pl> <202206211901.25LJ1uBd067376@critter.freebsd.dk> <CAPyFy2Ca83X042jc5QE-g=eHAfnukHScrTSyaLRi4UxeTBasJQ@mail.gmail.com> <20220622044923.6e2fac81c1e8205872d9de11@bidouilliste.com> <CACc-My0q-Ods_O-TDru=tEwjSOaUJZZd=ZTzD46nY1gjGYO_VA@mail.gmail.com> <CANCZdfoRCB5RuszKWTQazRuseRnapVqMTANnQTR0b61AHw54aQ@mail.gmail.com> <YrKhlZnlF%2ByxZd9X@troutmask.apl.washington.edu>

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On Tue, Jun 21, 2022, 10:59 PM Steve Kargl <sgk@troutmask.apl.washington.edu>
wrote:

> On Tue, Jun 21, 2022 at 10:55:01PM -0600, Warner Losh wrote:
> > On Tue, Jun 21, 2022, 9:47 PM Stefan Blachmann <sblachmann@gmail.com>
> wrote:
> >
> > > I would kindly ask to stop pushing for removal of sc.
> > >
> >
> > It will die soon enough if it doesn't become giant locked soon...
> >
> > Warner
> >
>
> Are you deleting vt, too?
>

The project likely has resources to remove giant from only one console
driver. That will almost certainly be vt.

Warner


> % grep -i giant /var/run/dmesg.boot
> atkbd0: [GIANT-LOCKED]
> WARNING: Device "fb" is Giant locked and may be deleted before FreeBSD
> 14.0.
> lock order reversal: (Giant after non-sleepable)
>  2nd 0xffffffff80c02840 Giant (Giant, sleep mutex) @
> /usr/src/sys/kern/kern_synch.c:232
> lock order Giant -> vtdev established at:
> lock order vtdev -> Giant attempted at:
>
> --
> Steve
>

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<div dir=3D"auto"><div><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Tue, Jun 21, 2022, 10:59 PM Steve Kargl &lt;<a href=
=3D"mailto:sgk@troutmask.apl.washington.edu">sgk@troutmask.apl.washington.e=
du</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Tue, Jun 21, 2=
022 at 10:55:01PM -0600, Warner Losh wrote:<br>
&gt; On Tue, Jun 21, 2022, 9:47 PM Stefan Blachmann &lt;<a href=3D"mailto:s=
blachmann@gmail.com" target=3D"_blank" rel=3D"noreferrer">sblachmann@gmail.=
com</a>&gt; wrote:<br>
&gt; <br>
&gt; &gt; I would kindly ask to stop pushing for removal of sc.<br>
&gt; &gt;<br>
&gt; <br>
&gt; It will die soon enough if it doesn&#39;t become giant locked soon...<=
br>
&gt; <br>
&gt; Warner<br>
&gt; <br>
<br>
Are you deleting vt, too?<br></blockquote></div></div><div dir=3D"auto"><br=
></div><div dir=3D"auto">The project likely has resources to remove giant f=
rom only one console driver. That will almost certainly be vt.</div><div di=
r=3D"auto"><br></div><div dir=3D"auto">Warner=C2=A0</div><div dir=3D"auto">=
<br></div><div dir=3D"auto"><div class=3D"gmail_quote"><blockquote class=3D=
"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding=
-left:1ex">
<br>
% grep -i giant /var/run/dmesg.boot <br>
atkbd0: [GIANT-LOCKED]<br>
WARNING: Device &quot;fb&quot; is Giant locked and may be deleted before Fr=
eeBSD 14.0.<br>
lock order reversal: (Giant after non-sleepable)<br>
=C2=A02nd 0xffffffff80c02840 Giant (Giant, sleep mutex) @ /usr/src/sys/kern=
/kern_synch.c:232<br>
lock order Giant -&gt; vtdev established at:<br>
lock order vtdev -&gt; Giant attempted at:<br>
<br>
-- <br>
Steve<br>
</blockquote></div></div></div>

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