linux-kernel - Re: [PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to do_arch_prctl

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Date:   Tue, 29 Nov 2016 10:26:24 +0100
From:   Ingo Molnar <mingo@...nel.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>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <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>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-devel@...ts.sourceforge.net>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-user@...ts.sourceforge.net>,
        "open list:FILESYSTEMS (VFS and infrastructure)" 
        <linux-fsdevel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, kvm list <kvm@...r.kernel.org>
Subject: Re: [PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to
 do_arch_prctl_64


* Kyle Huey <me@...ehuey.com> wrote:

> On Thu, Nov 17, 2016 at 11:27 PM, Ingo Molnar <mingo@...nel.org> wrote:
> >
> > * Kyle Huey <me@...ehuey.com> wrote:
> >
> >> In order to introduce new arch_prctls that are not 64 bit only, rename the
> >> existing 64 bit implementation to do_arch_prctl_64(). Also rename the second
> >> argument to arch_prctl(), which will no longer always be an address.
> >
> >>  #ifdef CONFIG_X86_64
> >>  void entry_SYSCALL_64(void);
> >> +long do_arch_prctl_64(struct task_struct *task, int code, unsigned long arg2);
> >>  #endif
> >
> > Could you please also rename the weirdly named 'code' argument to 'option',
> > to be in line with the existing sys_prctl() interface nomenclature?
> 
> arch_prctl consistently uses 'code' throughout the kernel and in the
> main page.  This renaming should probably be done separately if
> desired.

'arch_prctl' is essentially an x86-ism that arbitrarily changed 'option' to 'code' 
to implement a sub-option where the option was indeed 'code' - but with _your_ 
changes it becomes outright misleading and confusing: as the 'code' is not code 
anymore but one of the several options.

The core kernel uses 'option' and we should follow that nomenclature.

Thanks,

	Ingo