linux-kernel - Re: [PATCH v10 6/7] x86/arch_prctl: Add ARCH_[GET|SET]

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Message-Id: <201703150911.v2F9BsT1004205@mail.zytor.com>
Date:   Wed, 15 Mar 2017 02:11:48 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Andy Lutomirski <luto@...capital.net>
CC:     Kyle Huey <me@...ehuey.com>,
        "Robert O'Callahan" <robert@...llahan.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <shuah@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Len Brown <len.brown@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Dmitry Safonov <dsafonov@...tuozzo.com>,
        David Matlack <dmatlack@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "user-mode-linux-devel@...ts.sourceforge.net" 
        <user-mode-linux-devel@...ts.sourceforge.net>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-user@...ts.sourceforge.net>,
        Linux.FS.Devel@...or.com
Subject: Re: [PATCH v10 6/7] x86/arch_prctl: Add ARCH_[GET|SET]_CPUID

<linux-fsdevel@...r.kernel.org>,"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>,kvm list <kvm@...r.kernel.org>
From: hpa@...or.com
Message-ID: <E47D06A9-AFDA-4A9D-8539-9CC5AB19B395@...or.com>

On March 14, 2017 12:23:40 PM PDT, Andy Lutomirski <luto@...capital.net> wrote:
>On Tue, Mar 14, 2017 at 12:01 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> and at least theoretically we
>> could be indirecting though the ->stack pointer for every one if gcc
>> can't tell it won't have changed (we really need to get thread_info
>> moved into the task_struct allocation and away from the kernel stack,
>> especially since on x86 the pointer is the same size as the vestigial
>> structure it points to.)
>
>Solved by use of time machine:
>
>commit 15f4eae70d365bba26854c90b6002aaabb18c8aa
>Author: Andy Lutomirski <luto@...nel.org>
>Date:   Tue Sep 13 14:29:25 2016 -0700
>
>    x86: Move thread_info into task_struct
>
>
>:)

My apologies, -ESTALEBRAINCACHE...
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