linux-kernel - Re: [PATCH v4 01/17] x86/mpx: Do not use SIB index if index points to R/ESP

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Date:   Thu, 23 Feb 2017 08:24:32 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     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,
        x86@...nel.org, linux-msdos@...r.kernel.org, wine-devel@...ehq.org,
        Adam Buchbinder <adam.buchbinder@...il.com>,
        Colin Ian King <colin.king@...onical.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Qiaowei Ren <qiaowei.ren@...el.com>
Subject: Re: [PATCH v4 01/17] x86/mpx: Do not use SIB index if index points
 to R/ESP

On Wed, Feb 22, 2017 at 10:36:50PM -0800, Ricardo Neri wrote:
> +			/*
> +			 * A negative offset generally means a error, except
> +			 * -EDOM, which means that the contents of the register
> +			 * should not be used as index.
> +			 */
>  			if (indx_offset < 0)
> -				goto out_err;
> +				if (indx_offset == -EDOM)
> +					indx = 0;
> +				else
> +					goto out_err;
> +			else
> +				indx = regs_get_register(regs, indx_offset);

Kernel coding style requires more brackets than are strictly required by
C, any block longer than 1 line needs then. Also, if one leg of a
conditional needs them, then they should be on both legs.

Your code has many such instances, please change them all.