linux-kernel - Re: [PATCH 2/2] make work have a static address in do_boot

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Message-ID: <5d6222a80802211457s2beb4d5cre331bc800c28d111@mail.gmail.com>
Date:	Thu, 21 Feb 2008 19:57:39 -0300
From:	"Glauber Costa" <glommer@...il.com>
To:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Cc:	"Glauber Costa" <gcosta@...hat.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, mingo@...e.hu, arjan@...radead.org
Subject: Re: [PATCH 2/2] make work have a static address in do_boot_cpu()

On Thu, Feb 21, 2008 at 7:12 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
>
>  On Thu, 2008-02-21 at 17:40 -0300, Glauber Costa wrote:
>  > This patch makes the work field in create_idle have
>  > a static address. Otherwise, being a stack variable, it can
>  > boild down the lockdep system.
>
>  Looks way overkill. Doesn't something like:
>
>
>  > Signed-off-by: Glauber Costa <gcosta@...hat.com>
>  > ---
>  >  arch/x86/kernel/smpboot_64.c |   13 +++++++------
>  >  1 files changed, 7 insertions(+), 6 deletions(-)
>  >
>  > diff --git a/arch/x86/kernel/smpboot_64.c b/arch/x86/kernel/smpboot_64.c
>  > index f15b774..d79b7a8 100644
>  > --- a/arch/x86/kernel/smpboot_64.c
>  > +++ b/arch/x86/kernel/smpboot_64.c
>
>
> > @@ -553,12 +554,12 @@ static int __cpuinit do_boot_cpu(int cpu
>  >       unsigned long boot_error;
>  >       int timeout;
>  >       unsigned long start_rip;
>  >       struct create_idle create_idle = {
>  > -             .work = __WORK_INITIALIZER(create_idle.work, do_fork_idle),
>  >               .cpu = cpu,
>  >               .done = COMPLETION_INITIALIZER_ONSTACK(create_idle.done),
>  >       };
>  > +     INIT_WORK(&create_idle.work, do_fork_idle);
>
>  work?

Indeed.

I missed the static lock_class_key definition inside INIT_WORK macro.
It does the job neatly.


-- 
Glauber Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."
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