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

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Date: Fri, 5 Apr 2024 11:57:45 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Cc: paulmck@...nel.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, Zhenhua
 Huang <quic_zhenhuah@...cinc.com>
Subject: Re: [PATCH fs/proc/bootconfig] remove redundant comments from
 /proc/bootconfig

On Fri, 5 Apr 2024 10:23:24 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> On Thu, 4 Apr 2024 10:43:14 -0700
> "Paul E. McKenney" <paulmck@...nel.org> wrote:
> 
> > On Thu, Apr 04, 2024 at 08:55:22AM +0900, Masami Hiramatsu wrote:
> > > On Wed, 3 Apr 2024 12:16:28 -0700
> > > "Paul E. McKenney" <paulmck@...nel.org> 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>
> > > > Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> > > > Cc: Masami Hiramatsu <mhiramat@...nel.org>
> > > > Cc: <linux-trace-kernel@...r.kernel.org>
> > > > Cc: <linux-fsdevel@...r.kernel.org>
> > > 
> > > OOps, good catch! Let me pick it.
> > > 
> > > Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> > 
> > Thank you, and I have applied your ack and pulled this into its own
> > bootconfig.2024.04.04a.
> > 
> > My guess is that you will push this via your own tree, and so I will
> > drop my copy as soon as yours hits -next.
> 
> Thanks! I would like to make PR this soon as bootconfig fixes for v6.9-rc2.
> 

Hmm I found that this always shows the command line comment in
/proc/bootconfig even without "bootconfig" option.
I think that is easier for user-tools but changes the behavior and
a bit redundant.

We should skip showing this original argument comment if bootconfig is
not initialized (no "bootconfig" in cmdline) as it is now.

Thank you,


> Thank you,
> 
> > 
> > 							Thanx, Paul
> > 
> > > Thank you!
> > > 
> > > > 
> > > > diff --git a/fs/proc/bootconfig.c b/fs/proc/bootconfig.c
> > > > index 902b326e1e560..e5635a6b127b0 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);
> > > 
> > > 
> > > -- 
> > > Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> 
> -- 
> Masami Hiramatsu (Google) <mhiramat@...nel.org>


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>