linux-kernel - Re: [RFC PATCH 2/4] rseq: Allow extending struct rseq

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Message-ID: <87y2nk29rp.fsf@oldenburg2.str.redhat.com>
Date:   Wed, 15 Jul 2020 15:22:18 +0200
From:   Florian Weimer <fweimer@...hat.com>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     carlos <carlos@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        paulmck <paulmck@...ux.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        "H. Peter Anvin" <hpa@...or.com>, Paul Turner <pjt@...gle.com>,
        linux-api <linux-api@...r.kernel.org>,
        Christian Brauner <christian.brauner@...ntu.com>
Subject: Re: [RFC PATCH 2/4] rseq: Allow extending struct rseq

* Mathieu Desnoyers:

> Practically speaking, I suspect this would mean postponing availability of
> rseq for widely deployed applications for a few more years ?

There is no rseq support in GCC today, so you have to write assembler
code anyway.

Thanks,
Florian