linux-kernel - Re: [PULL] x86 cpumask work

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Message-ID: <20090318125735.GA8527@sgi.com>
Date:	Wed, 18 Mar 2009 07:57:35 -0500
From:	Cliff Wickman <cpw@....com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, travis@....com,
	steiner@....com
Subject: Re: [PULL] x86 cpumask work

Hi Rusty,

On Wed, Mar 18, 2009 at 08:22:30AM +1030, Rusty Russell wrote:
> On Wednesday 18 March 2009 05:26:30 Cliff Wickman wrote:
> > 
> > From: Cliff Wickman <cpw@....com>
> > 
> > A patch on Mar13 2009 introduced a bug. I hope the below 1-line fix can
> > make the 'urgent' list, and get fixed before that patch moves on.
> > 
> > The Mar13 patch is saved at
> > http://marc.info/?l=linux-kernel&m=123683186504948&w=2
> > 
> > The allocation of per-cpu uv_flush_tlb_mask's in arch/x86/kernel/tlb_uv.c
> > changed a variable that should been reset to 0.
> 
> Hi Cliff,
> 
>    Thanks for tracking this.  May I suggest this slightly enhanced version?

Yes, I agree. No need for double initialization.

Thanks.
-Cliff

> 
> Subject: cpumask: fix tlb_uv initialization
> 
> Impact: fix boot on UV systems
> 
> Commit 76ba0ecda0de9accea9a91cb6dbde46782110e1c "cpumask: use cpumask_var_t
> in uv_flush_tlb_others" used cur_cpu as an iterator; it was supposed to be
> zero for the code below it.
> 
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> 
> diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
> index 8afb691..deb5ebb 100644
> --- a/arch/x86/kernel/tlb_uv.c
> +++ b/arch/x86/kernel/tlb_uv.c
> @@ -751,7 +751,7 @@ static int __init uv_bau_init(void)
>  	int node;
>  	int nblades;
>  	int last_blade;
> -	int cur_cpu = 0;
> +	int cur_cpu;
>  
>  	if (!is_uv_system())
>  		return 0;
> @@ -765,6 +765,7 @@ static int __init uv_bau_init(void)
>  	uv_mmask = (1UL << uv_hub_info->n_val) - 1;
>  	nblades = 0;
>  	last_blade = -1;
> +	cur_cpu = 0;
>  	for_each_online_node(node) {
>  		blade = uv_node_to_blade_id(node);
>  		if (blade == last_blade)

-- 
Cliff Wickman
Silicon Graphics, Inc.
cpw@....com
(651) 683-3824
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