Re: How getting a pointer on the per-cpu struct tss_struct??

[Marko <letterdrop@gmx.de>]

Thanks for answering.

So when I don't want to change the kernel, the only way to get
a pointer on the IO Permission Bitmap is using the TSS entry in
the GDT??

Or is there another way to access the current structure tss_struct??


Marko Euth




On Sun, 12 Feb 2006 15:58:31 -0800 (PST)
Zwane Mwaikambo <zwane@arm.linux.org.uk> wrote:

> On Mon, 13 Feb 2006, Marko wrote:
> 
> > But when I try to compile this, I get the warning:
> > 
> > 	*** Warning: "per_cpu__init_tss" [/home/..../module.ko]
> > 	undefined!
> > 
> > and according to this warning an error, when I try to load the module:
> > 
> > 	insmod: error inserting 'module.ko': -1 Unknown symbol in module
> 
> init_tss isn't exported, you would need to do 
> EXPORT_PER_CPU_SYMBOL(init_tss).
> 
> Also a suggestion, you should use __get_cpu_var instead of per_cpu e.g.
> 
> 	struct tss_struct *t;
> 	/* if you don't need cpu variable just preempt_disable */
> 	int cpu = get_cpu();
> 	t = __get_cpu_var(init_tss);
> ...
> 	put_cpu();
> 
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