Messages in this thread | | | Date | Fri, 2 May 2014 23:28:39 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [RFC/HACK] x86: Fast return to kernel |
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On Fri, 2 May 2014, Linus Torvalds wrote:
> On Fri, May 2, 2014 at 1:30 PM, Thomas Gleixner <tglx@linutronix.de> wrote: > > > > So what about manipulating the stack so that the popf does not enable > > interrupts and do an explicit sti to get the benefit of the > > one-instruction shadow ? > > That's what I already suggested in the original "I don't think popf > works" email.
Missed that.
> It does get more complex since you now have to test things (there are > very much cases where we get page faults and other exceptions with > interrupts disabled), but it shouldn't be much worse.
Right. The extra conditional is probably not noticable at all.
Thanks,
tglx
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