linux-kernel - Re: [PATCH] x86: bau_msg_head points to a_queue_first in uv_table_bases

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Date:	Mon, 18 Jan 2010 07:35:04 -0600
From:	Cliff Wickman <cpw@....com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Roel Kluin <roel.kluin@...il.com>, Robin Holt <holt@....com>,
	Mike Travis <travis@....com>, Ingo Molnar <mingo@...hat.com>,
	x86@...nel.org, Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: bau_msg_head points to a_queue_first in
	uv_table_bases_finish()

Hi Ingo,

On Sun, Jan 17, 2010 at 08:12:27AM +0100, Ingo Molnar wrote:
> 
> * Roel Kluin <roel.kluin@...il.com> wrote:
> 
> > bau_msg_head should point to bau_msg_head
> > 
> > Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> > ---
> > Is this correct?
> > 
> > diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
> > index 364d015..3d66331 100644
> > --- a/arch/x86/kernel/tlb_uv.c
> > +++ b/arch/x86/kernel/tlb_uv.c
> > @@ -691,7 +691,7 @@ uv_table_bases_finish(int blade,
> >  			continue;
> >  
> >  		bcp = (struct bau_control *)&per_cpu(bau_control, cpu);
> > -		bcp->bau_msg_head	= bau_tablesp->va_queue_first;
> > +		bcp->bau_msg_head	= bau_tablesp->bau_msg_head;
> >  		bcp->va_queue_first	= bau_tablesp->va_queue_first;
> >  		bcp->va_queue_last	= bau_tablesp->va_queue_last;
> >  		bcp->msg_statuses	= bau_tablesp->msg_statuses;
> 
> Seems like you either caught a real bug - or that there's a somewhat quirky 
> initialization sequence here which should be commented upon in the source.
> 
> Cliff, Robin, what's your take on Roel's patch?
> 
> Thanks,
> 
> 	Ingo

The bau_tablesp->bau_msg_head doesn't seem to be initialized, so do not
change the code this way.

bcp->bau_msg_head is correctly initialized to the head of the queue as
it stands.

However I do agree that it is confusing, as there are redundant control
structures, and needs improvement.  I intend to submit a new version
of tlb_uv.c soon.

-Cliff

-- 
Cliff Wickman
SGI
cpw@....com
(651) 683-3824
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