Re: [RFC/HACK] x86: Fast return to kernel

[H. Peter Anvin]

On 05/02/2014 12:51 PM, Linus Torvalds wrote:
> On Fri, May 2, 2014 at 12:31 PM, Linus Torvalds
> <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>>
>> Also, are you *really* sure that "popf" has the same one-instruction
>> interrupt shadow that "sti" has? Because I'm not at all sure that is
>> true, and it's not documented as far as I can tell. In contrast, the
>> one-instruction shadow after "sti" very much _is_ documented.
> 
> Yeah, I'm pretty sure about this. The only instructions with an
> interrupt shadow are "sti", "mov ss" and "pop ss".
> 

I believe you are correct here.

	-hpa

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/