linux-kernel - Re: [PATCH v7 3/4] lib/cmdline.c Remove quotes symmetrically.

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Date:   Thu, 17 Aug 2017 23:27:40 +0200
From:   msuchanek <msuchanek@...e.de>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Jonathan Corbet <corbet@....net>, Jessica Yu <jeyu@...nel.org>,
        Rusty Russell <rusty@...tcorp.com.au>,
        Jason Baron <jbaron@...mai.com>,
        Hari Bathini <hbathini@...ux.vnet.ibm.com>,
        Mahesh J Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Daniel Axtens <dja@...ens.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Suchanek <msuchanek@...e.de>,
        Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>,
        Balbir Singh <bsingharora@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Michael Neuling <mikey@...ling.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Scott Wood <oss@...error.net>,
        "Oliver O'Halloran" <oohall@...il.com>,
        David Howells <dhowells@...hat.com>,
        "Sylvain 'ythier' Hitier" <sylvain.hitier@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Baoquan He <bhe@...hat.com>, linux-doc@...r.kernel.org,
        Lokesh Vutla <lokeshvutla@...com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-kernel@...r.kernel.org,
        "Steven Rostedt, " <rostedt@...dmis.org>,
        Tejun Heo <tj@...nel.org>,
        Ilya Matveychikov <matvejchikov@...il.com>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v7 3/4] lib/cmdline.c Remove quotes symmetrically.

On Thu, 17 Aug 2017 22:14:30 +0200
Michal Suchanek <msuchanek@...e.de> wrote:

> Remove quotes from argument value only if there is qoute on both
> sides.
> 
> Signed-off-by: Michal Suchanek <msuchanek@...e.de>
> ---
>  arch/powerpc/kernel/fadump.c | 6 ++----
>  lib/cmdline.c                | 7 ++-----
>  2 files changed, 4 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/fadump.c
> b/arch/powerpc/kernel/fadump.c index a1614d9b8a21..d7da4ce9f7ae 100644
> --- a/arch/powerpc/kernel/fadump.c
> +++ b/arch/powerpc/kernel/fadump.c
> @@ -489,10 +489,8 @@ static void __init fadump_update_params(struct
> param_info *param_info, *tgt++ = ' ';
>  
>  	/* next_arg removes one leading and one trailing '"' */
> -	if (*tgt == '"')
> -		shortening += 1;
> -	if (*(tgt + vallen + shortening) == '"')
> -		shortening += 1;
> +	if ((*tgt == '"') && (*(tgt + vallen + shortening) == '"'))
s/shortening/1/                                ^

in case somebody would want this patch and not the following one that
removes the code.