Re: [RFC 1/6]SEP initialization rework

[Zwane Mwaikambo]

On Tue, 5 Apr 2005, Li Shaohua wrote:

> On Tue, 2005-04-05 at 03:10, Zwane Mwaikambo wrote:
> > On Mon, 4 Apr 2005, Li Shaohua wrote:
> > 
> > >  linux-2.6.11-root/arch/i386/kernel/smpboot.c           |    6 ++++++
> > >  linux-2.6.11-root/arch/i386/kernel/sysenter.c          |   10 ++++++----
> > >  linux-2.6.11-root/arch/i386/mach-voyager/voyager_smp.c |    6 ++++++
> > >  3 files changed, 18 insertions(+), 4 deletions(-)
> > > 
> > > diff -puN arch/i386/kernel/sysenter.c~sep_init_cleanup arch/i386/kernel/sysenter.c
> > > --- linux-2.6.11/arch/i386/kernel/sysenter.c~sep_init_cleanup	2005-03-28 09:32:30.936304248 +0800
> > > +++ linux-2.6.11-root/arch/i386/kernel/sysenter.c	2005-03-28 09:58:20.703703792 +0800
> > > @@ -26,6 +26,11 @@ void enable_sep_cpu(void *info)
> > >  	int cpu = get_cpu();
> > >  	struct tss_struct *tss = &per_cpu(init_tss, cpu);
> > >  
> > > +	if (!boot_cpu_has(X86_FEATURE_SEP)) {
> > > +		put_cpu();
> > > +		return;
> > > +	}
> > > +
> > 
> > Do you have systems like this? Is it really skipping SEP if the boot 
> > processor doesn't have SEP?
> No, I haven't such system. This is the logic of original SEP
> initialization. If the CPU hasn't SEP, original logic doesn't call
> 'on_each_cpu(enable_sep_cpu,...)'.

Got it, so i misread.

Thanks,
	Zwane

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