linux-kernel - Re: [PATCH 1/2] workqueues: make get_online

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Message-ID: <20080702164038.GB565@tv-sign.ru>
Date:	Wed, 2 Jul 2008 20:40:38 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Gautham R Shenoy <ego@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Max Krasnyansky <maxk@...lcomm.com>, Paul Jackson <pj@....com>,
	Paul Menage <menage@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Vegard Nossum <vegard.nossum@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] workqueues: make get_online_cpus() useable for work->func()

On 07/02, Andrew Morton wrote:
>
> I know that Document/SubmitChecklist has a lot of stuff.  But a basic
> allnoconfig only takes seconds and it's often the thing which breaks.
> 
>  include/linux/cpu.h |   15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff -puN include/linux/cpu.h~workqueues-make-get_online_cpus-useable-for-work-func-fix include/linux/cpu.h
> --- a/include/linux/cpu.h~workqueues-make-get_online_cpus-useable-for-work-func-fix
> +++ a/include/linux/cpu.h
> @@ -69,10 +69,11 @@ static inline void unregister_cpu_notifi
>  #endif
>  
>  int cpu_up(unsigned int cpu);
> -
>  extern void cpu_hotplug_init(void);
> +extern void cpu_maps_update_begin(void);
> +extern void cpu_maps_update_done(void);
>  
> -#else
> +#else	/* CONFIG_SMP */
>  
>  static inline int register_cpu_notifier(struct notifier_block *nb)
>  {
> @@ -87,10 +88,16 @@ static inline void cpu_hotplug_init(void
>  {
>  }
>  
> +static inline void cpu_maps_update_begin(void)
> +{
> +}
> +
> +static inline void cpu_maps_update_done(void)
> +{
> +}

Oh thanks...

This also means that we can't kill workqueue_lock (as I was going to do),
we still need it for !CONFIG_HOTPLUG_CPU case.

Oleg.

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