linux-kernel - Re: [PATCH v16 08/10] x86/arch_prctl: Add ARCH_[GET|SET]

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Date:   Mon, 20 Mar 2017 16:00:16 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Kyle Huey <me@...ehuey.com>
cc:     Robert O'Callahan <robert@...llahan.org>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, 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>,
        Nadav Amit <nadav.amit@...il.com>,
        Andi Kleen <andi@...stfloor.org>,
        Grzegorz Andrejczuk <grzegorz.andrejczuk@...el.com>,
        linux-kernel@...r.kernel.org,
        user-mode-linux-devel@...ts.sourceforge.net,
        user-mode-linux-user@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH v16 08/10] x86/arch_prctl: Add ARCH_[GET|SET]_CPUID

On Mon, 20 Mar 2017, Kyle Huey wrote:
> --- a/arch/x86/include/uapi/asm/prctl.h
> +++ b/arch/x86/include/uapi/asm/prctl.h
> @@ -6,8 +6,17 @@
>  #define ARCH_GET_FS 0x1003
>  #define ARCH_GET_GS 0x1004
>  
> +#define ARCH_GET_CPUID 0x1005
> +#define ARCH_SET_CPUID 0x1006
> +
>  #define ARCH_MAP_VDSO_X32	0x2001
>  #define ARCH_MAP_VDSO_32	0x2002
>  #define ARCH_MAP_VDSO_64	0x2003
>  
> +#ifdef CONFIG_CHECKPOINT_RESTORE
> +# define ARCH_MAP_VDSO_X32	0x2001
> +# define ARCH_MAP_VDSO_32	0x2002
> +# define ARCH_MAP_VDSO_64	0x2003
> +#endif

That hunk is bogus in two aspects:
     - It's just a copy of the above wrapped in a ifdef
     
     - The ifdef is broken, because the UAPI headers do not know about
       that.

I dropped it.