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

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Date:	Wed, 09 Mar 2011 22:36:31 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jason Baron <jbaron@...hat.com>
Cc:	peterz@...radead.org, hpa@...or.com, mathieu.desnoyers@...ymtl.ca,
	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, ddaney@...iumnetworks.com,
	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 Wed, 2011-03-09 at 15:47 -0500, Jason Baron wrote:
> Hi,
> 
> Re-fresh of updates against latest -tip tree.

Thanks Jason,

I started looking at them, I should have comments tomorrow (if I have
any comments ;)

> 
> I've tried to split this update up somewhat, but I've only succeeded to split
> out the dynamic debug bits. The interface changes and re-write are quite
> intertwined.
> 
> I believe this update should address all the comments from the previous posting
> except for Mathieu's request for a section of jump label pointers that point to
> the jump label structures (since the compiler might leave gaps in the jump label
> structures).

The jump label structures is a list of 3 pointers, correct? I doubt that
gcc would place any holes in it as they are all aligned by natural word
size.

>  I've got a prototype patch to address this issue but its somewhat
> invasive, and thus I'd like to leave it as a follow-up item. I have to date,
> not seen this issue in practice.
> 
> thanks,
> 
> -Jason
> 
> 
> Jason Baron (2):
>   jump label: introduce static_branch() interface
>   dynamic debug: add jump label support
> 
>  arch/mips/include/asm/jump_label.h  |   22 +-
>  arch/mips/kernel/jump_label.c       |    2 +-

Could we get Ralf's acked-by for the mips code.

>  arch/sparc/include/asm/jump_label.h |   25 +-

Could we get David Miller's Acked-by for sparc.

Thanks,

-- Steve

>  arch/x86/include/asm/alternative.h  |    3 +-
>  arch/x86/include/asm/jump_label.h   |   26 +-
>  arch/x86/kernel/alternative.c       |    2 +-
>  arch/x86/kernel/jump_label.c        |    2 +-
>  arch/x86/kernel/module.c            |    1 +
>  include/asm-generic/vmlinux.lds.h   |   14 +-
>  include/linux/dynamic_debug.h       |   44 +++-
>  include/linux/jump_label.h          |   86 ++++---
>  include/linux/jump_label_ref.h      |   44 ---
>  include/linux/perf_event.h          |   26 +-
>  include/linux/tracepoint.h          |   22 +-
>  kernel/jump_label.c                 |  537 ++++++++++++++---------------------
>  kernel/perf_event.c                 |    4 +-
>  kernel/tracepoint.c                 |   23 +-
>  lib/dynamic_debug.c                 |    4 +-
>  18 files changed, 391 insertions(+), 496 deletions(-)
>  delete mode 100644 include/linux/jump_label_ref.h


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