linux-kernel - Re: [PATCH v15 6/9] x86/arch_prctl: Add ARCH_[GET|SET]

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Date:   Tue, 14 Mar 2017 14:47:02 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Kyle Huey <me@...ehuey.com>
Cc:     "Robert O'Callahan" <robert@...llahan.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "the arch/x86 maintainers" <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>,
        Dmitry Safonov <dsafonov@...tuozzo.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        David Matlack <dmatlack@...gle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Andi Kleen <andi@...stfloor.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        uml-devel <user-mode-linux-devel@...ts.sourceforge.net>,
        user-mode-linux-user@...ts.sourceforge.net,
        linux-kselftest@...r.kernel.org, KVM list <kvm@...r.kernel.org>
Subject: Re: [PATCH v15 6/9] x86/arch_prctl: Add ARCH_[GET|SET]_CPUID

Kyle,
 your patch format is really odd.

You seem to have *eight* lines of context rather than the regular 3.
Is there any reason for that oddity?

It basically means that a one-line hunk ends up being 17 lines of
unified diff rather than 7.

Example appended,

                  Linus

On Sat, Mar 11, 2017 at 11:46 AM, Kyle Huey <me@...ehuey.com> wrote:
>
> diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
> index ad6f5eb07a95..9fc44b95f7cb 100644
> --- a/arch/x86/include/asm/thread_info.h
> +++ b/arch/x86/include/asm/thread_info.h
> @@ -82,16 +82,17 @@ struct thread_info {
>  #define TIF_SIGPENDING         2       /* signal pending */
>  #define TIF_NEED_RESCHED       3       /* rescheduling necessary */
>  #define TIF_SINGLESTEP         4       /* reenable singlestep on user return*/
>  #define TIF_SYSCALL_EMU                6       /* syscall emulation active */
>  #define TIF_SYSCALL_AUDIT      7       /* syscall auditing active */
>  #define TIF_SECCOMP            8       /* secure computing */
>  #define TIF_USER_RETURN_NOTIFY 11      /* notify kernel of userspace return */
>  #define TIF_UPROBE             12      /* breakpointed or singlestepping */
> +#define TIF_NOCPUID            15      /* CPUID is not accessible in userland */
>  #define TIF_NOTSC              16      /* TSC is not accessible in userland */
>  #define TIF_IA32               17      /* IA32 compatibility process */
>  #define TIF_NOHZ               19      /* in adaptive nohz mode */
>  #define TIF_MEMDIE             20      /* is terminating due to OOM killer */
>  #define TIF_POLLING_NRFLAG     21      /* idle is polling for TIF_NEED_RESCHED */
>  #define TIF_IO_BITMAP          22      /* uses I/O bitmap */
>  #define TIF_FORCED_TF          24      /* true if TF in eflags artificially */
>  #define TIF_BLOCKSTEP          25      /* set when we want DEBUGCTLMSR_BTF */