linux-kernel - Re: Documentation/locking/locktypes: Further clarifications and wordsmithing

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Date:   Wed, 25 Mar 2020 17:54:22 +0100
From:   Sebastian Siewior <bigeasy@...utronix.de>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Jonathan Corbet <corbet@....net>,
        Randy Dunlap <rdunlap@...radead.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        linux-pci@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
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        Kalle Valo <kvalo@...eaurora.org>,
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        Zhang Rui <rui.zhang@...el.com>,
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        linux-pm@...r.kernel.org, Len Brown <lenb@...nel.org>,
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        Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org,
        Michal Simek <monstr@...str.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Arnd Bergmann <arnd@...db.de>,
        Geoff Levand <geoff@...radead.org>,
        linuxppc-dev@...ts.ozlabs.org, Davidlohr Bueso <dbueso@...e.de>
Subject: Re: Documentation/locking/locktypes: Further clarifications and
 wordsmithing

On 2020-03-25 09:39:19 [-0700], Paul E. McKenney wrote:
> > > --- a/Documentation/locking/locktypes.rst
> > > +++ b/Documentation/locking/locktypes.rst
> > …
> > > +rw_semaphore
> > > +============
> > > +
> > > +rw_semaphore is a multiple readers and single writer lock mechanism.
> > > +
> > > +On non-PREEMPT_RT kernels the implementation is fair, thus preventing
> > > +writer starvation.
> > > +
> > > +rw_semaphore complies by default with the strict owner semantics, but there
> > > +exist special-purpose interfaces that allow non-owner release for readers.
> > > +These work independent of the kernel configuration.
> > 
> > This reads funny, could be my English. "This works independent …" maybe?
> 
> The "These" refers to "interfaces", which is plural, so "These" rather
> than "This".  But yes, it is a bit awkward, because you have to skip
> back past "readers", "release", and "non-owner" to find the implied
> subject of that last sentence.
> 
> So how about this instead, making the implied subject explicit?
> 
> rw_semaphore complies by default with the strict owner semantics, but there
> exist special-purpose interfaces that allow non-owner release for readers.
> These interfaces work independent of the kernel configuration.

Yes, perfect. Thank you.

> 							Thanx, Paul

Sebastian