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From: Eric Sunshine <sunshine@sunshineco.com>
To: Andreas Schwab <schwab@linux-m68k.org>
Cc: Andreas Hasenack <andreas@canonical.com>, git@vger.kernel.org
Subject: Re: chainlink.pl /proc/cpuinfo regexp fails on s390x
Date: Wed, 23 Nov 2022 14:10:56 -0500	[thread overview]
Message-ID: <CAPig+cT5dxrS2-xUSYfot7k6v0qV0TXh=xSMe7Y-oMGLMhbjVA@mail.gmail.com> (raw)
In-Reply-To: <mvm1qpu9g2e.fsf@linux-m68k.org>

On Wed, Nov 23, 2022 at 4:27 AM Andreas Schwab <schwab@linux-m68k.org> wrote:
> On Nov 22 2022, Eric Sunshine wrote:
> > On Tue, Nov 22, 2022 at 6:37 PM Andreas Schwab <schwab@linux-m68k.org> wrote:
> >> On Nov 22 2022, Andreas Hasenack wrote:
> >> > /^processor[\s\d]*:/
> >> > or something else.
> >>
> >> Something else.
> >> $ getconf _NPROCESSORS_ONLN
> >
> > Yes, that works too and was (I'm pretty sure) considered during
> > development. The reason /proc/cpu was chosen over `getconf` was that
> > opening & reading /proc/cpu should be faster since it doesn't involve
> > spawning a process. If we did use `getconf`, we'd have to be careful
> > to degrade gracefully if `getconf` isn't available or if the
> > configuration parameter (i.e. "_NPROCESSORS_ONLN") isn't known on the
> > platform.
>
> getconf is surely more portable than poking in /proc, especially
> /proc/cpuinfo is the antipode of portability.

No doubt, but for the immediate issue, this tightly-focused fix is
more appropriate and less likely to lead to unexpected additional
problems. I'm not arguing against `getconf`, but saying only that
_this_ patch is fine as-is.

It may very well be a good idea to replace the /proc/cpuinfo probe by
`getconf` in the future (or remove it altogether as mentioned
upstream), but that's outside the scope of this patch and the
immediate problem.

      reply	other threads:[~2022-11-23 19:11 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-22 17:37 chainlink.pl /proc/cpuinfo regexp fails on s390x Andreas Hasenack
2022-11-22 17:57 ` Eric Sunshine
2022-11-22 18:04   ` Andreas Hasenack
2022-11-22 18:13     ` Eric Sunshine
2022-11-22 18:42       ` Andreas Hasenack
2022-11-22 19:39         ` Eric Sunshine
2022-11-22 23:30 ` Andreas Schwab
2022-11-22 23:50   ` Eric Sunshine
2022-11-23  9:27     ` Andreas Schwab
2022-11-23 19:10       ` Eric Sunshine [this message]

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