Because you are doing something weird (like Pin, for example) and take an asynchronous fault?
On July 12, 2014 11:37:48 AM PDT, Andi Kleen <a...@firstfloor.org> wrote: >> This seems like it's asking for trouble. I think wxe'd have to >> separately save the selectors and the base registers to avoid >breaking >> something, especially once wrgsbase, etc are enabled. > >I agree, it would likely break existing code. > >> Linus, for context, the other patch in this series saves and restores >> SS. > >> Without that, 64-bit sigreturn to a nondefault stack segment is >> basically impossible. > >Why would you ever want to do that? > >-Andi -- Sent from my mobile phone. Please pardon brevity and lack of formatting. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
