linux-kernel - Re: [PATCH 1/4] jffs2: Convert most D1/D2 macros to jffs2

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Message-ID: <1330965033.7220.16.camel@golum>
Date:	Mon, 05 Mar 2012 18:30:33 +0200
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] jffs2: Convert most D1/D2 macros to jffs2_dbg

On Wed, 2012-02-15 at 15:56 -0800, Joe Perches wrote:
> D1 and D2 macros are mostly uses to emit debugging messages.
> 
> Convert the logging uses of D1 & D2 to jffs2_dbg(level, fmt, ...)
> to be a bit more consistent style with the rest of the kernel.
> 
> All jffs2_dbg output is now at KERN_DEBUG where some of
> the previous uses were emitted at various KERN_<LEVEL>s.

I would just kill all the levels and left only the first one - others
are not useful. This FS is in the kernel for ages and it is safe to
assume it is robust enough to require no level 2. And change the Kconfig
correspondingly.

I would accept that to my l2 tree, although the final word is from
dwmw2, of course.

> 
> Signed-off-by: Joe Perches <joe@...ches.com>

Would it please be possible to make the patch which introduces jffs2_dbg
macros be separate? It is very difficult to find the definition (most
interesting in this patch) while looking at the e-mail.


> @@ -47,7 +47,8 @@ int jffs2_start_garbage_collect_thread(struct jffs2_sb_info *c)
>  		ret = PTR_ERR(tsk);
>  	} else {
>  		/* Wait for it... */
> -		D1(printk(KERN_DEBUG "JFFS2: Garbage collect thread is pid %d\n", tsk->pid));
> +		jffs2_dbg(1, "JFFS2: Garbage collect thread is pid %d\n",
> +			  tsk->pid);

Notice JFFS2 prefix.

> -		D1(printk(KERN_DEBUG "jffs2: Killing GC task %d\n", c->gc_task->pid));
> +		jffs2_dbg(1, "jffs2: Killing GC task %d\n", c->gc_task->pid);

Here and in many other places we have jffs2: prefix.

How about make one more step forward and remove this prefix from all the
messages and make it to be part of the 'jffs2_dbg' macro?

Really, just mechanical D1 -> jffs2_dbg() translation is not so
interesting.

> -			D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread():  kthread_stop() called.\n"));
> +			jffs2_dbg(1, "%s(): kthread_stop() called\n", __func__);

A lot of messages have the function name prefix - would you make another
step forward and make this to be generated by 'jffs2_dbg()' instead as
well?

I believe you may not worry about breaking anything by changing the
messages.


> +				jffs2_dbg(1, "%s(): SIGSTOP received\n",
> +					  __func__);

May become a one-liner here and in many other places.

> ;
> +				jffs2_dbg(1, "%s(): SIGKILL received\n",
> +					  __func__);

Ditto, and there are many other places.
 
> -	D1(printk(KERN_DEBUG "jffs2_erase_block(): erase block %#08x (range %#08x-%#08x)\n",
> -				jeb->offset, jeb->offset, jeb->offset + c->sector_size));
> +	jffs2_dbg(1, "%s(): erase block %#08x (range %#08x-%#08x)\n",
> +		  __func__,
> +		  jeb->offset, jeb->offset, jeb->offset + c->sector_size);

Probably lines can be joined?

>  				if (jeb == c->gcblock) {
> -					D1(printk(KERN_DEBUG "Expanding down to cover frag (0x%x-0x%x) in gcblock at %08x\n",
> -						  frag->ofs, frag->ofs+frag->size, ref_offset(raw)));
> +					jffs2_dbg(1, "Expanding down to cover frag (0x%x-0x%x) in gcblock at %08x\n",
> +						  frag->ofs,
> +						  frag->ofs + frag->size,
> +						  ref_offset(raw));

Lines can be joined, and in other places as well.

> -						  frag->ofs, frag->ofs+frag->size, jeb->offset));
> +					jffs2_dbg(1, "Not expanding down to cover frag (0x%x-0x%x) in clean block %08x\n",
> +						  frag->ofs,
> +						  frag->ofs + frag->size,
> +						  jeb->offset);

> -		D1(printk(KERN_DEBUG "Obsoleting previously unchecked node at 0x%08x of len %x: ", ref_offset(ref), freed_len));
> +			jffs2_dbg(1, "Obsoleting previously unchecked node at 0x%08x of len %x\n",
> +				  ref_offset(ref), freed_len);

What happened to the indentation?

> -		D1(printk(KERN_DEBUG "Obsoleting node at 0x%08x of len %#x: ", ref_offset(ref), freed_len));
> +			jffs2_dbg(1, "Obsoleting node at 0x%08x of len %#x: ",
> +				  ref_offset(ref), freed_len);

And here.

... did not review further.

-- 
Best Regards,
Artem Bityutskiy

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