linux-kernel - Re: [PATCH 1/3] wait-simple: Introduce the simple waitqueue implementation

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Message-ID: <20131212095533.1fab411f@gandalf.local.home>
Date:	Thu, 12 Dec 2013 09:55:33 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] wait-simple: Introduce the simple waitqueue
 implementation

On Thu, 12 Dec 2013 09:48:06 -0500
Paul Gortmaker <paul.gortmaker@...driver.com> wrote:
 
> 1) git mv wait.[ch] --- > cwait.[ch]
>    make an empty wait.h include cwait.h temporarily
> 
> 2) rename all existing functions in cwait.[ch] to have an added
>   "c" prefix (or similar)
>    
>    in wait.h, temporarily add a bunch of things like
>           #define wait_xyz  cwait_xyz
>    so that things still compile and link.

What about instead change all users of wait_*() to cwait_*().

Then the next steps would be to skip 3 and jump right to 4)

> 
> 3) track down the users who really need the extra complexity
>    and have them use cwait calls and include cwait.h
> 
> 4) bring in the simple wait queue support as wait.c and wait.h
>    and delete the defines added in step two.  This will be the
>    flag day commit.

Not a flag day commit, as no one is using it. Then start converting all
users back to the wait_*() functions one at a time. If something
breaks, we know which one it was.

-- Steve

> 
> Is that what we want to do here?
> 
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