linux-kernel - [RFC PATCH 0/4] rseq: Introduce extensible struct rseq

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Date:   Mon, 13 Jul 2020 23:03:44 -0400
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...ux.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        "H . Peter Anvin" <hpa@...or.com>, Paul Turner <pjt@...gle.com>,
        linux-api@...r.kernel.org,
        Christian Brauner <christian.brauner@...ntu.com>,
        Florian Weimer <fw@...eb.enyo.de>, carlos@...hat.com,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [RFC PATCH 0/4] rseq: Introduce extensible struct rseq

Recent discussion led to a solution for extending struct rseq. This is
an implementation of the proposed solution.

Now is a good time to agree on this scheme before the release of glibc
2.32, just in case there are small details to fix on the user-space
side in order to allow extending struct rseq.

Thanks,

Mathieu

Mathieu Desnoyers (4):
  selftests: rseq: Use fixed value as rseq_len parameter
  rseq: Allow extending struct rseq
  selftests: rseq: define __rseq_abi with extensible size
  selftests: rseq: print rseq extensible size in basic test

 include/linux/sched.h                     |  4 +++
 include/uapi/linux/rseq.h                 | 42 ++++++++++++++++++++--
 kernel/rseq.c                             | 44 +++++++++++++++++++----
 tools/testing/selftests/rseq/basic_test.c | 15 ++++++++
 tools/testing/selftests/rseq/rseq.c       |  8 +++--
 5 files changed, 101 insertions(+), 12 deletions(-)

-- 
2.17.1