lkml.org 
[lkml]   [2005]   [Apr]   [4]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC 5/6]clean cpu state after hotremove CPU
FromLi Shaohua <>
DateTue, 05 Apr 2005 09:06:34 +0800
On Tue, 2005-04-05 at 03:11, Zwane Mwaikambo wrote:
> On Mon, 4 Apr 2005, Li Shaohua wrote:
> 
> > Clean up all CPU states including its runqueue and idle thread, 
> > so we can use boot time code without any changes.
> > Note this makes /sys/devices/system/cpu/cpux/online unworkable.
> > 
> >  #ifdef CONFIG_HOTPLUG_CPU
> >  #include <asm/nmi.h>
> > +
> > +#ifdef CONFIG_STR_SMP
> > +extern void cpu_exit_clear(int);
> > +#endif
> 
> Perhaps change that ifdef to denote something which clearly shows that its 
> physical hotplug as we'll need this for other users too.
Ok.

> > +#ifdef CONFIG_STR_SMP
> > +extern void do_exit_idle(void);
> > +extern void cpu_uninit(void);
> > +void cpu_exit_clear(int cpu)
> > +{
> > +	int sibling;
> > +	cpucount --;
> 
> Is that protected by the cpu_control semaphore?
cpu_exit_clear is called before the dead CPU ack CPU_DEAD, so it's
finished before __cpu_die returns, which is protected by cpu_control.
Maybe I should add comments for it.

Thanks,
Shaohua

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-04-06 13:31    [from the cache]
©2003-2008