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

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Message-ID: <1299782143.15854.402.camel@gandalf.stny.rr.com>
Date:	Thu, 10 Mar 2011 13:35:43 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jason Baron <jbaron@...hat.com>
Cc:	David Daney <ddaney@...iumnetworks.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	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, Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH 0/2] jump label: update for .39

On Thu, 2011-03-10 at 13:20 -0500, Jason Baron wrote:
> On Thu, Mar 10, 2011 at 01:04:01PM -0500, Steven Rostedt wrote:
> Now its up to the linker to decide where to place that element. Can we
> > guarantee that it will always be on an 8 byte boundery?
> > Hmm, I wonder if we could add a .ALIGN sizeof(long) before that?
> > 
> 
> we can. Sparc does it, see: arch/sparc/include/asm/jump_label.h.
> 
> So I guess it would be .align 8 for 64-bit and .align 4 for 32-bit...

Now what about the vmlinux.ld? That has a align 8. Is that a one time
short (align to 8 bytes here), or will it carry through aligning the
rest of the section. If not, perhaps we may be OK.

-- Steve


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