Re: [PATCH v7 5/9] x86/smpboot: Split up native_cpu_up into separate phases and document them

[Yuan Yao]

On Wed, Feb 08, 2023 at 12:02:55PM +0000, David Woodhouse wrote:
> On Wed, 2023-02-08 at 18:03 +0800, Yuan Yao wrote:
> >
> > >   #endif
> > > +       /*
> > > +        * Sync point with do_wait_cpu_initialized(). On boot, all secondary
> > > +        * CPUs reach this stage after receiving INIT/SIPI from do_cpu_up()
> > > +        * in the x86/cpu:kick cpuhp stage. At the start of cpu_init() they
> > > +        * will wait for do_wait_cpu_initialized() to set their bit in
> > > +        * smp_callout_mask to release them.
> >
> > The last sentence of the comment looks confused. The fact is:
> >
> > For serial case, The BSP waits AP to set cpu_initialized_mask from
> > wait_for_master_cpu() after fired INIT/SIPI, then AP starts to wait
> > cpu_callout_mask set by BSP from do_boot_cpu().
> >
> > Or the comments below "Bringup step two:..." which also looks clear
> > enough then above.
>
>
> 	/*
> 	 * Sync point with do_wait_cpu_initialized(). Before proceeding through
> 	 * cpu_init(), the AP will call wait_for_master_cpu() which sets its
> 	 * bit in cpu_initialized_mask and then waits for the BSP to set its
> 	 * bit in cpu_callout_mask to release it.
> 	 */
> 	cpu_init_secondary();
>
>
> Better?

Yes, it's better to me, thanks.