Re: [RFC 1/6]SEP initialization rework

[Li Shaohua]

Hi,

On Mon, 2005-04-04 at 16:46, Pavel Machek 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;
> > +	}
> > +
> >  	tss->ss1 = __KERNEL_CS;
> >  	tss->esp1 = sizeof(struct tss_struct) + (unsigned long) tss;
> >  	wrmsr(MSR_IA32_SYSENTER_CS, __KERNEL_CS, 0);
> > @@ -41,7 +46,7 @@ void enable_sep_cpu(void *info)
> >  extern const char vsyscall_int80_start, vsyscall_int80_end;
> >  extern const char vsyscall_sysenter_start, vsyscall_sysenter_end;
> >  
> > -static int __init sysenter_setup(void)
> > +int __init sysenter_setup(void)
> >  {
> >  	void *page = (void *)get_zeroed_page(GFP_ATOMIC);
> >  
> 
> Can this still be __init? I think you are calling it from hotplug code
> now, right?
Only BP executes it. AP calls enable_sep_cpu.

> 
> > diff -puN arch/i386/kernel/smpboot.c~sep_init_cleanup arch/i386/kernel/smpboot.c
> > --- linux-2.6.11/arch/i386/kernel/smpboot.c~sep_init_cleanup	2005-03-28 09:33:49.972288952 +0800
> > +++ linux-2.6.11-root/arch/i386/kernel/smpboot.c	2005-03-28 09:46:01.814032096 +0800
> > @@ -415,6 +415,8 @@ static void __init smp_callin(void)
> >  
> >  static int cpucount;
> >  
> > +extern int sysenter_setup(void);
> > +extern void enable_sep_cpu(void *);
> >  /*
> >   * Activate a secondary processor.
> >   */
> 
> Perhaps these should go to header file somewhere?
in asm-i386/smp.h?

Thanks,
Shaohua

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