Re: [PATCH v2] locking/rtmutex: Use acquire/release semantics

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2] locking/rtmutex: Use acquire/release semantics
Date	2015-09-29 23:00 +0200
Message-ID	<qeaae-Lp-3@gated-at.bofh.it> (permalink)
References	<qbfJ7-fE-3@gated-at.bofh.it> <qbfJ8-fE-15@gated-at.bofh.it> <qc3cS-4zX-5@gated-at.bofh.it> <qdhx8-4wG-15@gated-at.bofh.it> <qdMKB-Ox-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Mon, 28 Sep 2015, Davidlohr Bueso wrote:
> On Sun, 27 Sep 2015, Thomas Gleixner wrote:
> > That changelog is not really helpful if someone is going to look at it
> > half a year from now who doesn't have the background of the discussion
> > leading to these changes.
> 
> Ok, how does the following sound?
> 
> ""
> As of 654672d4ba1 (locking/atomics: Add _{acquire|release|relaxed}() variants
> of some atomic operations) and 6d79ef2d30e (locking, asm-generic: Add
> _{relaxed|acquire|release}() variants for 'atomic_long_t'), weakly ordered
> archs can benefit from more relaxed use of barriers when locking and
> unlocking,
> instead of regular full barrier semantics. While currently only arm64 supports
> such optimizations, updating corresponding locking primitives serves for other
> archs to immediately benefit as well, once the necessary machinery is
> implemented
> of course.
> ""
> 
> It's not _that_ different from the original changelong, but it should allow
> future readers to at least be able to easily see the context of where the
> changes come from. I don't think it's of much use going into the actual code
> changes as they are pretty obvious -- and the ones that aren't (ie relaxed)
> have the justification in the comments.

Ok, care to resend the whole thing?

Thanks,

	tglx


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[PATCH v2] locking/rtmutex: Use acquire/release semantics Davidlohr Bueso <dave@stgolabs.net> - 2015-09-24 03:10 +0200
  Re: [PATCH v2] locking/rtmutex: Use acquire/release semantics Thomas Gleixner <tglx@linutronix.de> - 2015-09-27 12:40 +0200
    Re: [PATCH v2] locking/rtmutex: Use acquire/release semantics Davidlohr Bueso <dave@stgolabs.net> - 2015-09-28 22:00 +0200
      Re: [PATCH v2] locking/rtmutex: Use acquire/release semantics Thomas Gleixner <tglx@linutronix.de> - 2015-09-29 23:00 +0200

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