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From: Andy Lutomirski <luto@amacapital.net>
Date: Thu, 7 Apr 2016 09:46:29 -0700
Message-ID: <CALCETrVxR8etKN6WBi0NJ=4u9GUHBLWzvahYGK2Y47GdkTL9UQ@mail.gmail.com>
Subject: Re: [RFC PATCH v6 1/5] Thread-local ABI system call: cache CPU number
 of running thread
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>, Florian Weimer <fweimer@redhat.com>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Russell King <linux@arm.linux.org.uk>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-api <linux-api@vger.kernel.org>, Paul Turner <pjt@google.com>,
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        Ben Maurer <bmaurer@fb.com>, rostedt <rostedt@goodmis.org>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Josh Triplett <josh@joshtriplett.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Boqun Feng <boqun.feng@gmail.com>
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On Thu, Apr 7, 2016 at 9:39 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> Can anybody give a *coherent* and actual *real* reason why the kernel
> would ever care about anything else?

The rseq data structure, which is still being designed.

OTOH, that thing could be registered separately by userspace.

--Andy