linux-kernel - Re: [PATCH v10 1/7] x86/boot: Introduce cmdline_find_option

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Date:   Tue, 6 Nov 2018 13:22:53 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Chao Fan <fanc.fnst@...fujitsu.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-efi@...r.kernel.org, linux-acpi@...r.kernel.org,
        tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        keescook@...omium.org, bhe@...hat.com, msys.mizuma@...il.com,
        indou.takao@...fujitsu.com, caoj.fnst@...fujitsu.com
Subject: Re: [PATCH v10 1/7] x86/boot: Introduce cmdline_find_option_arg()to
 detect if option=arg in cmdline

On Mon, Oct 22, 2018 at 05:37:14PM +0800, Chao Fan wrote:
> Now, there are cmdline_find_option() and cmdline_find_option_bool() in
> cmdline.c. Sometimes, when detecting such as whether 'acpi=off' is
> in cmdline, we need to cmdline_find_option() first, then compare
> the argument. Now splite the operation as a independent function.
> Introduce a new function cmdline_find_option_arg() to detect whether
> option is in command line and the value is arg.

For all future commit messages you write:

Use passive tone in your commit message: no "we", etc.

Also, pls read section "2) Describe your changes" in
Documentation/process/submitting-patches.rst.

> Signed-off-by: Chao Fan <fanc.fnst@...fujitsu.com>
> ---
>  arch/x86/boot/compressed/cmdline.c | 15 +++++++++++++++
>  arch/x86/boot/compressed/misc.h    |  1 +
>  2 files changed, 16 insertions(+)
> 
> diff --git a/arch/x86/boot/compressed/cmdline.c b/arch/x86/boot/compressed/cmdline.c
> index af6cda0b7900..61118c69feb8 100644
> --- a/arch/x86/boot/compressed/cmdline.c
> +++ b/arch/x86/boot/compressed/cmdline.c
> @@ -1,5 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0
>  #include "misc.h"
> +#define STATIC
> +#include <linux/decompress/mm.h>
>  
>  #if CONFIG_EARLY_PRINTK || CONFIG_RANDOMIZE_BASE || CONFIG_X86_5LEVEL
>  
> @@ -30,5 +32,18 @@ int cmdline_find_option_bool(const char *option)
>  {
>  	return __cmdline_find_option_bool(get_cmd_line_ptr(), option);
>  }
> +bool cmdline_find_option_arg(const char *option, const char *arg, int argsize)
> +{
> +	char *buffer = malloc(argsize+1);
> +	bool find = false;
> +	int ret;
> +
> +	ret = cmdline_find_option(option, buffer, argsize+1);
> +	if (ret == argsize && !strncmp(buffer, arg, argsize))
> +		find = true;
> +
> +	free(buffer);
> +	return find;
> +}

I don't think such wrapper is needed. Simply calling
cmdline_find_option() and then examining the buffer - like other call
sites do - is perfectly fine.

Thx.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.