linux-kernel - Re: [PATCH v4 15/17] x86/traps: Fixup general protection faults caused by UMIP

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Date:   Fri, 24 Feb 2017 11:36:19 -0800
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Brian Gerst <brgerst@...il.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Liang Z Li <liang.z.li@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Huang Rui <ray.huang@....com>, Jiri Slaby <jslaby@...e.cz>,
        Jonathan Corbet <corbet@....net>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Chen Yucong <slaoub@...il.com>,
        Alexandre Julliard <julliard@...ehq.org>,
        Stas Sergeev <stsp@...t.ru>, Fenghua Yu <fenghua.yu@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Shuah Khan <shuah@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        X86 ML <x86@...nel.org>, linux-msdos@...r.kernel.org,
        wine-devel@...ehq.org, Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH v4 15/17] x86/traps: Fixup general protection faults
 caused by UMIP

On Fri, 2017-02-24 at 11:11 -0800, Andy Lutomirski wrote:
> > In a previous version Andy Lutomirsky suggested that
> >         if (user_mode(regs) && (fixup_umip_exception(regs) == 0))
> >
> > was easier to read :). Although at the time fixup_umip_exception
> > returned a numeric value. Now it only returns true/false for
> > successful/failed emulation. If with true/false not comparing to
> true
> > makes it easier to read, I will make the change.
> 
> I think == true is silly :)

Then I'll make the change.

Thanks and BR,
Ricardo