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From:   Florian Weimer <fweimer@redhat.com>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Dave Hansen via Libc-alpha <libc-alpha@sourceware.org>,
        Len Brown <lenb@kernel.org>,
        Dave Hansen <dave.hansen@intel.com>,
        Rich Felker <dalias@libc.org>,
        Linux API <linux-api@vger.kernel.org>,
        "Bae, Chang Seok" <chang.seok.bae@intel.com>,
        X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
        Kyle Huey <me@kylehuey.com>, Borislav Petkov <bp@alien8.de>,
        Andy Lutomirski <luto@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Keno Fischer <keno@juliacomputing.com>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Willy Tarreau <w@1wt.eu>
Subject: Re: Candidate Linux ABI for Intel AMX and hypothetical new related
 features
References: <CAJvTdKn6JHo02karEs0e5g+6SimS5VUcXKjCkX35WY+xkgAgxw@mail.gmail.com>
        <YIMmwhEr46VPAZa4@zn.tnic>
        <CAJvTdKnhXnynybS4eNEF_EtF26auyb-mhKLNd1D9_zvCrchZsw@mail.gmail.com>
        <874kf11yoz.ffs@nanos.tec.linutronix.de>
        <CAJvTdKkYp+zP_9tna6YsrOz2_nmEUDLJaL_i-SNog0m2T9wZ=Q@mail.gmail.com>
        <87k0ntazyn.ffs@nanos.tec.linutronix.de>
        <37833625-3e6b-5d93-cc4d-26164d06a0c6@intel.com>
        <CAJvTdKmqzO4P9k3jqRA=dR+B7yV72hZCiyC8HGQxDKZBnXgzZQ@mail.gmail.com>
        <9c8138eb-3956-e897-ed4e-426bf6663c11@intel.com>
        <87pmxk87th.fsf@oldenburg.str.redhat.com>
        <YKfIct+DhpEBbaCQ@hirez.programming.kicks-ass.net>
Date:   Wed, 23 Jun 2021 17:06:35 +0200
In-Reply-To: <YKfIct+DhpEBbaCQ@hirez.programming.kicks-ass.net> (Peter
        Zijlstra's message of "Fri, 21 May 2021 16:49:22 +0200")
Message-ID: <87wnqkzklg.fsf@oldenburg.str.redhat.com>
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* Peter Zijlstra:

> On Fri, May 21, 2021 at 04:44:58PM +0200, Florian Weimer wrote:
>
>> And we added an interface for querying x86 CPU features to glibc 2.33
>> which is completely incompatible with this because it assumes that CPU
>> features do not change during the lifetime of a process. 8-(
>
> How many x86 kernel maintainers signed off on that patch?

I've started a new thread:

  x86 CPU features detection for applications (and AMX)
  <https://lore.kernel.org/linux-api/87tulo39ms.fsf@oldenburg.str.redhat.com/>

Thanks,
Florian