On August 22, 2016 3:47:48 PM PDT, Brian Gerst <[email protected]> wrote: >On Mon, Aug 22, 2016 at 6:23 PM, H. Peter Anvin <[email protected]> wrote: >> On August 22, 2016 2:48:46 PM PDT, Andi Kleen <[email protected]> >wrote: >>>Josh Poimboeuf <[email protected]> writes: >>> >>>> This zeroed word has no apparent purpose, so remove it. >>>> >>>> Brian Gerst says: >>>> >>>> "FYI the word used to be the SS segment selector for the LSS >>>> instruction, which isn't needed in 64-bit mode." >>>> >>> >>>Seems dangerous. It wouldn't surprise me if some CPUs or x86 >emulations >>>load it anyways and trigger page faults if there is really nothing >>>there. >>> >>>-Andi >> >> Yes, seems pointlessly risky. > >It was added in commit 9cf4f298e29abba25c16679fe7be70898223167e, >copied from 32-bit but never used. It doesn't look like we ever used >LSS on 64-bit. > >-- >Brian Gerst
Ah, ok. Wasn't in front of a computer. -- Sent from my Android device with K-9 Mail. Please excuse brevity and formatting.
