linux-kernel - Re: [PATCH 0/2 v2] dcache: get/release read lock in read_seqbegin_or

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Date:	Thu, 12 Sep 2013 09:38:17 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Waiman Long <Waiman.Long@...com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>
Subject: Re: [PATCH 0/2 v2] dcache: get/release read lock in
 read_seqbegin_or_lock() & friend

On Thu, Sep 12, 2013 at 7:55 AM, Waiman Long <Waiman.Long@...com> wrote:
> Change log
> ----------
> v1->v2:
>   - Rename the new seqlock primitives to read_seqexcl_lock* and
>     read_seqexcl_unlock*.

Applied. Except I peed in the snow and renamed the functions
again.That whole "seqexcl" looked too odd to me. It not only looks a
bit too much like random noise, but it makes it seem a whole different
lock from the "seqlock" thing.

I wanted to pattern the name after "write_seq[un]lock()", since it
most resembles that (not just in implementation, but in usage: the
traditional read-sequence isn't a lock, it's a begin/retry sequence,
so the usage pattern is totally different too, and the naming is
different).

I ended up picking "read_seq[un]lock_excl()". I could have gone with
"excl_" as a prefix too, I guess. Whatever. Now the "_excl" thing
looks a bit like the "_bh"/"_irqX" context modifier, and I think it
matches our normal lock naming pattern better.

            Linus
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