> Hi everyone:
>
> I read the linux kernel 2.2.13 source code,and find that in
> arch/i386/kernel/process.c switch_to function use inline asm 'ltr' to load
> the new task register which I thought can be loaded automatically when
> 'iretd','call',or 'ljmp' executed. anyone know why it still use 'ltr' here?
Because TSS gates are _slow_. Doing task switch by hands is much faster.
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