linux-kernel - [PATCH] Documentation: Clarify better about the rwsem non-owner release issue

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Date:   Sat, 21 Mar 2020 22:19:38 -0400
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Ingo Molnar <mingo@...hat.com>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Logan Gunthorpe <logang@...tatee.com>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org Felipe Balbi" <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org Kalle Valo" <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Oleg Nesterov <oleg@...hat.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] Documentation: Clarify better about the rwsem non-owner release issue

Reword and clarify better about the rwsem non-owner release issue.

Link: https://lore.kernel.org/linux-pci/20200321212144.GA6475@google.com/

Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
 Documentation/locking/locktypes.rst | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Documentation/locking/locktypes.rst b/Documentation/locking/locktypes.rst
index 6f2c0f5b041e..656dce72f11f 100644
--- a/Documentation/locking/locktypes.rst
+++ b/Documentation/locking/locktypes.rst
@@ -292,7 +292,7 @@ implementations to provide priority inheritance for all lock types except
 the truly spinning ones. Priority inheritance on ownerless locks is
 obviously impossible.
 
-For now the rwsem non-owner release excludes code which utilizes it from
-being used on PREEMPT_RT enabled kernels. In same cases this can be
-mitigated by disabling portions of the code, in other cases the complete
-functionality has to be disabled until a workable solution has been found.
+For now, a PREEMPT_RT kernel just disables code sections that perform a
+non-owner release of an rwsem. In some cases, parts of the code are disabled.
+In other cases, the complete functionality has to be disabled until a workable
+solution has been found.
-- 
2.25.1.696.g5e7596f4ac-goog