linux-kernel - Re: [RFC PATCH v11 for 4.15 01/24] Restartable sequences system call

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Message-ID: <CY4PR15MB168866BFDCFECF81B7EF4CF1CF280@CY4PR15MB1688.namprd15.prod.outlook.com>
Date:   Tue, 14 Nov 2017 20:39:23 +0000
From:   Ben Maurer <bmaurer@...com>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Watson <davejwatson@...com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        Paul Turner <pjt@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <linux@....linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, Andrew Hunter <ahh@...gle.com>,
        Andi Kleen <andi@...stfloor.org>, Chris Lameter <cl@...ux.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Josh Triplett <josh@...htriplett.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC PATCH v11 for 4.15 01/24] Restartable sequences system call

>       int rseq(struct rseq * rseq, uint32_t rseq_len, int flags, uint32_t sig);

Really dumb question -- and one I'm sorry to bring up at the last minute. Should we consider making the syscall name something more generic "register_tls_abi"? I'm assuming that if we ever want to use a per-thread userspace/kernel ABI we'll want to use this field given the difficulty of getting adoption of registration, the need to involve glibc, etc. It seems like there could be future use cases of this TLS area that have nothing to do with rseq.