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Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init

From "H. Peter Anvin" <hpa@zytor.com>
Newsgroups linux.kernel
Subject Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init
Date 2016-01-20 15:50 +0100
Message-ID <qT2f8-7Ty-29@gated-at.bofh.it> (permalink)
References (6 earlier) <qSSIO-1jE-65@gated-at.bofh.it> <qSSSu-1pe-35@gated-at.bofh.it> <qSYEz-5ea-15@gated-at.bofh.it> <qSYEz-5ea-13@gated-at.bofh.it> <qSYOd-5wS-5@gated-at.bofh.it>
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On January 20, 2016 3:05:19 AM PST, Borislav Petkov <bp@suse.de> wrote:
>On Wed, Jan 20, 2016 at 02:55:24AM -0800, H. Peter Anvin wrote:
>> How about:
>> 
>> section for code used exclusively before alternatives are run.  All
>references to such code must be patched out by alternatives, normally
>by using a patch with X86_FEATURE_ALWAYS.
>> 
>> See static_cpu_has() for an example.
>
>Sure.
>
>My thinking was to make it a bit more generic so that if we decide to
>do
>some different monkey business with the alternatives, to put stuff in
>there too.
>
>But we can always change that later - it's not like it is user-visible.

I don't think the verbiage I suggested in any way disagrees with that notion.
-- 
Sent from my Android device with K-9 Mail. Please excuse brevity and formatting.

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Thread

[PATCH] x86: static_cpu_has_safe: discard dynamic check after init Brian Gerst <brgerst@gmail.com> - 2016-01-16 20:30 +0100
  Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-16 20:40 +0100
    Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Brian Gerst <brgerst@gmail.com> - 2016-01-16 21:00 +0100
      Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-17 11:40 +0100
        Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Brian Gerst <brgerst@gmail.com> - 2016-01-18 18:00 +0100
          Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Andy Lutomirski <luto@amacapital.net> - 2016-01-18 18:50 +0100
          Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-18 19:20 +0100
            Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Andy Lutomirski <luto@amacapital.net> - 2016-01-18 19:30 +0100
              Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-18 19:40 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-18 20:50 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-19 00:10 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-19 00:20 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-19 00:30 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-19 15:00 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-19 17:30 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-20 00:20 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Andy Lutomirski <luto@amacapital.net> - 2016-01-20 00:30 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Boris Petkov <bp@suse.de> - 2016-01-20 01:00 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 05:10 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-20 11:40 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 11:50 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-21 23:20 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-21 23:30 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-22 00:00 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-22 00:40 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-22 00:40 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-22 11:40 +0100
            Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-18 20:00 +0100
              Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-19 02:20 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-19 02:40 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-19 10:30 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 05:10 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init Brian Gerst <brgerst@gmail.com> - 2016-01-20 05:40 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 05:50 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 12:00 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-20 12:10 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 15:50 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-20 12:00 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-20 16:10 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 16:20 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init Borislav Petkov <bp@suse.de> - 2016-01-20 17:10 +0100
                Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after  init "H. Peter Anvin" <hpa@zytor.com> - 2016-01-20 17:20 +0100

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