linux-kernel - Re: optimizing out inline functions

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Message-Id: <20080529014033.90b0566b.akpm@linux-foundation.org>
Date:	Thu, 29 May 2008 01:40:33 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Pekka Enberg" <penberg@...helsinki.fi>
Cc:	"Steve French" <smfrench@...il.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: optimizing out inline functions

On Wed, 28 May 2008 22:54:47 +0300 "Pekka Enberg" <penberg@...helsinki.fi> wrote:

> On Wed, May 28, 2008 at 10:51 PM, Steve French <smfrench@...il.com> wrote:
> > Is one or the other style (with or without #define of empty function)
> > preferred?  Does the compiler optimize both #else clauses out
> > properly?  sparse and checkpatch seem to take either
> 
> Both are optimized out but empty function is preferred for type checking.

Plus the inlined function can help suppress unused-var warnings because
it counts as a "use".

Sometimes this works the other way and the argument to the macro/inline
just doesn't exist, in which case we're forced to use a macro for the stub.



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