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

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Message-ID: <20090313045516.GA27326@elte.hu>
Date:	Fri, 13 Mar 2009 05:55:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	Mike Travis <travis@....com>
Subject: Re: [PULL] x86 cpumask work


* Rusty Russell <rusty@...tcorp.com.au> wrote:

> On Friday 13 March 2009 13:50:15 Ingo Molnar wrote:
> > 
> > * Rusty Russell <rusty@...tcorp.com.au> wrote:
> > 
> > > On Friday 13 March 2009 11:27:43 Ingo Molnar wrote:
> > > > 
> > > > * Rusty Russell <rusty@...tcorp.com.au> wrote: 
> > > > > Missing a core patch (it even got a compile warning with that 
> > > > > config).
> > > > So it's manual work and sometimes i notice them amongst a 
> > > > boatload of other warnings, sometimes i dont.
> > > 
> > > Me too :( I thought you were starting a de-warning tree?  I'd 
> > > be happy to send you patches (particularly, exporting 
> > > deprecated symbols should not give a warning!).
> > 
> > Yeah - i have a de-warning tree, but it's not yet fully up and 
> > running for -tip qa automation.
> > 
> > > > > But there's something else wrong.  Firing up my 64-bit 
> > > > > test box now.
> > > > 
> > > > Great - so you can reproduce. Thanks,
> > > 
> > > Yep, and I'm running some stress tests as well now.
> > > 
> > > Perhaps throw away that tree, and I'll feed you a new one (the 
> > > core patch needs to go at the front), but I can work either 
> > > way.
> > 
> > Ok, i dropped it back to d95c357.
> > 
> > Suggestion for future workflow: we wouldnt have these somewhat 
> > stressful (and stressful to you mostly!), large hickups and 
> > history-less trees if you sent stuff more gradually and not so 
> > close to the merge window. You exposed some of your changes to 
> > linux-next but that's not nearly enough testing in practice for 
> > x86-affecting patches.
> 
> Yes, I wanted to complete the patchset to make sure I wasn't going to hit
> some subtle problem.
> 
> OK, please check the first patch (it's a new addition, I *think* using
> the topology_* macros is right here), and the other change is:
> 
> Here's the other change: it's a little ugly (AFAICT boot_cpu_data isn't
> even *used* on 64 bit, so a cleanup may be in order):
> 
> +++ b/arch/x86/kernel/smpboot.c
> @@ -329,6 +329,23 @@ notrace static void __cpuinit start_seco
>  	cpu_idle();
>  }
>  
> +#ifdef CONFIG_CPUMASK_OFFSTACK
> +/* In this case, llc_shared_map is a pointer to a cpumask. */
> +static inline void copy_cpuinfo_x86(struct cpuinfo_x86 *dst,
> +				    const struct cpuinfo_x86 *src)
> +{
> +	struct cpumask *llc = dst->llc_shared_map;
> +	*dst = *src;
> +	dst->llc_shared_map = llc;
> +}
> +#else
> +static inline void copy_cpuinfo_x86(struct cpuinfo_x86 *dst,
> +				    const struct cpuinfo_x86 *src)
> +{
> +	*dst = *src;
> +}
> +#endif /* CONFIG_CPUMASK_OFFSTACK */
> +
>  /*
>   * The bootstrap kernel entry code has set these up. Save them for
>   * a given CPU
> @@ -338,7 +355,7 @@ void __cpuinit smp_store_cpu_info(int id
>  {
>  	struct cpuinfo_x86 *c = &cpu_data(id);
>  
> -	*c = boot_cpu_data;
> +	copy_cpuinfo_x86(c, &boot_cpu_data);
>  	c->cpu_index = id;
>  	if (id != 0)
>  		identify_secondary_cpu(c);
> 
> BTW, these didn't go thru linux-next: your testing is better and your
> tree is too different or me to ask Stephen to merge.
> 
> Thanks!
> Rusty.
> 
> The following changes since commit d95c3578120e5bc4784069439f00ccb1b5f87717:
>   Ingo Molnar (1):
>         Merge branch 'x86/core' into cpus4096
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-x86.git cpus4096

Pulled, thanks Rusty!

Will let you know if something breaks.

	Ingo
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