Re: [RFC 1/6]SEP initialization rework

[Zwane Mwaikambo <zwane@arm.linux.org.uk>]

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?
-
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