linux-kernel - Re: [PATCH 1/1] mm: unify pmd

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Date:	Mon, 28 Jul 2008 08:53:46 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andrea Righi <righi.andrea@...il.com>
cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] mm: unify pmd_free() implementation

On Mon, 28 Jul 2008, Andrea Righi wrote:
>
> Move multiple definitions of pmd_free() from different include/asm-* into
> mm/util.c.

But this is horrible, because it forces a totally unnecessary function 
call for that empty function.

Yeah, the function will be cheap, but the call itself will not be (it's a 
C language barrier and basically disables optimizations around it, causing 
thigns like register spill/reload for no good reason).

		Linus
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