Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support

From	hpa@zytor.com
Newsgroups	linux.kernel
Subject	Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support
Date	2016-12-15 22:20 +0100
Message-ID	<sOLBw-2r7-19@gated-at.bofh.it> (permalink)
References	(6 earlier) <sO4mS-7jz-15@gated-at.bofh.it> <sOFmp-6RD-7@gated-at.bofh.it> <sOItX-km-7@gated-at.bofh.it> <sOJzI-1bX-21@gated-at.bofh.it> <sOLia-23N-25@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On December 15, 2016 11:20:17 AM PST, Andi Kleen <ak@linux.intel.com> wrote:
>
>The code is not calling CPUID in any performance critical path, only
>at initialization. So any discussion about saving a few instructions
>is a complete waste of time.
>
>-Andi

NB: the chief offender is Loadlin, which is still used in some manufacturing flows that depends on a mix of legacy DOS and Linux applications; however, older versions of LILO also have this problem.
-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

Thread

Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support "H. Peter Anvin" <hpa@zytor.com> - 2016-12-13 23:50 +0100
  Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support Boris Petkov <bp@alien8.de> - 2016-12-14 00:10 +0100
    Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support Borislav Petkov <bp@alien8.de> - 2016-12-15 15:40 +0100
      Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support hpa@zytor.com - 2016-12-15 19:00 +0100
        Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support Borislav Petkov <bp@alien8.de> - 2016-12-15 20:10 +0100
          Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support hpa@zytor.com - 2016-12-15 22:00 +0100
          Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support hpa@zytor.com - 2016-12-15 22:20 +0100
          Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support Andi Kleen <ak@linux.intel.com> - 2016-12-15 23:20 +0100

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