linux-kernel - Re: [PATCH 1/1] fs/proc: remove redudant comments from /proc/bootconfig

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Date: Wed, 3 Jan 2024 13:58:57 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Zhenhua Huang <quic_zhenhuah@...cinc.com>
Cc: mhiramat@...nel.org, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	quic_tingweiz@...cinc.com
Subject: Re: [PATCH 1/1] fs/proc: remove redudant comments from
 /proc/bootconfig

On Tue, Jan 02, 2024 at 06:19:37PM +0800, Zhenhua Huang wrote:
> commit 717c7c894d4b ("fs/proc: Add boot loader arguments as comment to
> /proc/bootconfig") adds bootloader argument comments into /proc/bootconfig.
> 
> /proc/bootconfig shows boot_command_line[] multiple times following
> every xbc key value pair, that's duplicated and not necessary.
> Remove redundant ones.
> 
> Output before and after the fix is like:
> key1 = value1
> *bootloader argument comments*
> key2 = value2
> *bootloader argument comments*
> key3 = value3
> *bootloader argument comments*
> ...
> 
> key1 = value1
> key2 = value2
> key3 = value3
> *bootloader argument comments*
> ...
> 
> Fixes: 717c7c894d4b ("fs/proc: Add boot loader arguments as comment to /proc/bootconfig")
> Signed-off-by: Zhenhua Huang <quic_zhenhuah@...cinc.com>

Good catch, and what I get for testing with only a single bootconfig
parameter.  :-/

Reviewed-by: Paul E. McKenney <paulmck@...nel.org>
Tested-by: Paul E. McKenney <paulmck@...nel.org>

> ---
>  fs/proc/bootconfig.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/proc/bootconfig.c b/fs/proc/bootconfig.c
> index 902b326..e5635a6 100644
> --- a/fs/proc/bootconfig.c
> +++ b/fs/proc/bootconfig.c
> @@ -62,12 +62,12 @@ static int __init copy_xbc_key_value_list(char *dst, size_t size)
>  				break;
>  			dst += ret;
>  		}
> -		if (ret >= 0 && boot_command_line[0]) {
> -			ret = snprintf(dst, rest(dst, end), "# Parameters from bootloader:\n# %s\n",
> -				       boot_command_line);
> -			if (ret > 0)
> -				dst += ret;
> -		}
> +	}
> +	if (ret >= 0 && boot_command_line[0]) {
> +		ret = snprintf(dst, rest(dst, end), "# Parameters from bootloader:\n# %s\n",
> +			       boot_command_line);
> +		if (ret > 0)
> +			dst += ret;
>  	}
>  out:
>  	kfree(key);
> -- 
> 2.7.4
>