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Groups > linux.kernel > #1534591
| From | Andy Lutomirski <luto@amacapital.net> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 2/4] Revert "x86/boot: Fail the boot if !M486 and CPUID is missing" |
| Date | 2016-12-02 01:40 +0100 |
| Message-ID | <sJK3n-4BW-7@gated-at.bofh.it> (permalink) |
| References | <sJjPz-2oq-7@gated-at.bofh.it> <sJjPz-2oq-5@gated-at.bofh.it> <sJszw-87u-3@gated-at.bofh.it> <sJvxo-1QI-29@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, Dec 1, 2016 at 1:02 AM, Borislav Petkov <bp@alien8.de> wrote: > On Thu, Dec 01, 2016 at 06:53:50AM +0100, Peter Zijlstra wrote: >> On Wed, Nov 30, 2016 at 12:34:53PM -0800, Andy Lutomirski wrote: >> > This reverts commit ed68d7e9b9cfb64f3045ffbcb108df03c09a0f98. >> > >> > The patch wasn't quite correct -- there are non-Intel (and hence >> > non-486) CPUs that we support that don't have CPUID. Since we no >> > longer require CPUID for sync_core(), just revert the patch. >> >> Might be useful to enumerate which special parts these are. > > Right, and since we test for CPUID support at early boot, I think we > should use the X86_FEATURE_CPUID aspect from what I proposed earlier: > > https://lkml.kernel.org/r/20161120111917.pw3alolx4fksfwbv@pd.tnic Maybe we should just make the kernel work fully without CPUID. There isn't much to do on top of your patch -- I think we mainly want to make the cpuid driver refuse to load. --Andy
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[PATCH 2/4] Revert "x86/boot: Fail the boot if !M486 and CPUID is missing" Andy Lutomirski <luto@kernel.org> - 2016-11-30 21:40 +0100
Re: [PATCH 2/4] Revert "x86/boot: Fail the boot if !M486 and CPUID is missing" Peter Zijlstra <peterz@infradead.org> - 2016-12-01 07:00 +0100
Re: [PATCH 2/4] Revert "x86/boot: Fail the boot if !M486 and CPUID is missing" Borislav Petkov <bp@alien8.de> - 2016-12-01 10:10 +0100
Re: [PATCH 2/4] Revert "x86/boot: Fail the boot if !M486 and CPUID is missing" Thomas Gleixner <tglx@linutronix.de> - 2016-12-01 11:20 +0100
[PATCH] x86/CPU: Add X86_FEATURE_CPUID Borislav Petkov <bp@alien8.de> - 2016-12-01 12:20 +0100
Re: [PATCH] x86/CPU: Add X86_FEATURE_CPUID Andy Lutomirski <luto@amacapital.net> - 2016-12-01 18:10 +0100
Re: [PATCH 2/4] Revert "x86/boot: Fail the boot if !M486 and CPUID is missing" Andy Lutomirski <luto@amacapital.net> - 2016-12-02 01:40 +0100
Re: [PATCH 2/4] Revert "x86/boot: Fail the boot if !M486 and CPUID is missing" Andy Lutomirski <luto@amacapital.net> - 2016-12-01 18:10 +0100
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