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References: <20190513005104.20140-1-shawn@git.icu>
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From: Shawn Landden <slandden@gmail.com>
Date: Tue, 14 May 2019 14:00:19 -0500
Message-ID: <CA+49okpasZrVx3xP64envJ+w4gf8U8f1z98Oj=EuFQbVufYPog@mail.gmail.com>
Subject: Re: [PATCH] powerpc: Allow may_use_simd() to function as feature
 detection
To: Segher Boessenkool <segher@kernel.crashing.org>
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Wireguard is not in the kernel (yet) and uses these symbols. (It is
IS_ENABLED so doesn't need it, but I think it is reasonable) I think these
enable/disable symbols should not be marked GPL-only.

El mar., 14 may. 2019 13:06, Segher Boessenkool <segher@kernel.crashing.org=
>
escribi=C3=B3:

> On Tue, May 14, 2019 at 09:49:18AM -0300, Shawn Landden wrote:
> > ARM does this, so we might as well too.
> > I am a bit confused however as CONFIG_ALTIVEC does not select
> > CONFIG_PPC_FPU. Would you ever have altivec without a fpu?
>
> There is no hardware like that, none supported anyway.  It does not make
> very much sense, and it cannot happen with VSX, so no hardware like it
> will ever show up most likely.
>
> It is much simpler to just make a Kconfig dependency (or a select) betwee=
n
> the symbols than to have to add code like this patch.
>


>
> Segher
>

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<div dir=3D"auto"><div>Wireguard is not in the kernel (yet) and uses these =
symbols. (It is IS_ENABLED so doesn&#39;t need it, but I think it is reason=
able) I think these enable/disable symbols should not be marked GPL-only.<b=
r><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">El m=
ar., 14 may. 2019 13:06, Segher Boessenkool &lt;<a href=3D"mailto:segher@ke=
rnel.crashing.org" rel=3D"noreferrer noreferrer" target=3D"_blank">segher@k=
ernel.crashing.org</a>&gt; escribi=C3=B3:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex">On Tue, May 14, 2019 at 09:49:18AM -0300, Shawn Landden wrote:<br>
&gt; ARM does this, so we might as well too.<br>
&gt; I am a bit confused however as CONFIG_ALTIVEC does not select<br>
&gt; CONFIG_PPC_FPU. Would you ever have altivec without a fpu?<br>
<br>
There is no hardware like that, none supported anyway.=C2=A0 It does not ma=
ke<br>
very much sense, and it cannot happen with VSX, so no hardware like it<br>
will ever show up most likely.<br>
<br>
It is much simpler to just make a Kconfig dependency (or a select) between<=
br>
the symbols than to have to add code like this patch.<br></blockquote></div=
></div><div dir=3D"auto"><br></div><div dir=3D"auto"><div class=3D"gmail_qu=
ote"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex">
<br>
<br>
Segher<br>
</blockquote></div></div></div>

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