From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Tue, 25 Feb 2020 15:18:11 +0000 (-0500)
Subject: Fix: rcu: Fix data-race due to atomic_t copy-by-value (5.5.6, 5.4.22)
X-Git-Tag: v2.11.2~1
X-Git-Url: http://git.liburcu.org/?a=commitdiff_plain;h=d8dc04aa1a4ebbd5fa332376aaf1782d6e47d99e;hp=d8dc04aa1a4ebbd5fa332376aaf1782d6e47d99e;p=lttng-modules.git

Fix: rcu: Fix data-race due to atomic_t copy-by-value (5.5.6, 5.4.22)

The following upstream commit has been backported to stable kernels
5.5.6 and 5.4.22:

  commit 6cf539a87a61a4fbc43f625267dbcbcf283872ed
  Author: Marco Elver <elver@google.com>
  Date:   Wed Oct 9 17:57:43 2019 +0200

    rcu: Fix data-race due to atomic_t copy-by-value

    This fixes a data-race where `atomic_t dynticks` is copied by value. The
    copy is performed non-atomically, resulting in a data-race if `dynticks`
    is updated concurrently.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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