linux-kernel - Re: [PATCH] SCHED: remove proliferation of wait_on

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Message-ID: <30874.1399997326@warthog.procyon.org.uk>
Date:	Tue, 13 May 2014 17:08:46 +0100
From:	David Howells <dhowells@...hat.com>
To:	NeilBrown <neilb@...e.de>
Cc:	dhowells@...hat.com, Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Steven Whitehouse <swhiteho@...hat.com>, dm-devel@...hat.com,
	Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
	Steve French <sfrench@...ba.org>,
	"Theodore Ts'o" <tytso@....edu>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-nfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] SCHED: remove proliferation of wait_on_bit action functions.

NeilBrown <neilb@...e.de> wrote:

> The current "wait_on_bit" interface requires an 'action' function
> to be provided which does the actual waiting.
> There are over 20 such functions, many of them identical.
> Most cases can be satisfied by one of just two functions, one
> which uses io_schedule() and one which just uses schedule().
> 
> So:
>  Rename wait_on_bit and        wait_on_bit_lock to
>         wait_on_bit_action and wait_on_bit_lock_action
>  to make it explicit that they need an action function.
> 
>  Introduce new wait_on_bit{,_lock} and wait_on_bit{,_lock}_io
>  which are *not* given an action function but implicitly use
>  a standard one.
>  The decision to error-out if a signal is pending is now made
>  based on the 'mode' argument rather than being encoded in the action
>  function.

Yay!  About time!  This is something I've wanted to do for ages, but never
quite got around to.

Acked-by: David Howells <dhowells@...hat.com>
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