linux-kernel - Re: [PATCH 0/2] jump label: update for .39

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Message-ID: <BLU0-SMTP8711FDC58A80D77733924496CB0@phx.gbl>
Date:	Thu, 10 Mar 2011 21:39:08 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Ralf Baechle <ralf@...ux-mips.org>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	David Daney <ddaney@...iumnetworks.com>,
	Jason Baron <jbaron@...hat.com>, peterz@...radead.org,
	hpa@...or.com, mingo@...e.hu, tglx@...utronix.de,
	andi@...stfloor.org, roland@...hat.com, rth@...hat.com,
	masami.hiramatsu.pt@...achi.com, fweisbec@...il.com,
	avi@...hat.com, davem@...emloft.net, sam@...nborg.org,
	michael@...erman.id.au, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] jump label: update for .39

* Ralf Baechle (ralf@...ux-mips.org) wrote:
> On Thu, Mar 10, 2011 at 04:22:14PM -0500, Mathieu Desnoyers wrote:
> 
> > You seem to be contradicting yourself here. I'm concerned about having
> > "structures" of a size not power of two. Can we simply either
> > 
> > - Add a padding element at the end
> > or
> > - use .align 4*sizeof(long) at the beginning
> > 
> > to make sure the linker won't put any holes when it puts objects 
> > together ?
> 
> It may only be a technicality but but careful with .align.  On some
> architectures .align x will align to a multiple of x; on other
> architectures to 2^x.  Another reason to stick to C wherever possible.

Thanks for the reminder! Not sure if using C is practical in the case of
jump labels though. As Michael pointed out, using .balign might be
better here.

Mathieu

> 
>   Ralf

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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