linux-ext4 - Re: [PATCH] ext4: add KERN

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Date:   Wed, 25 May 2022 08:18:22 -0700
From:   Joe Perches <joe@...ches.com>
To:     Yu Zhe <yuzhe@...china.com>, tytso@....edu,
        adilger.kernel@...ger.ca
Cc:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        liqiong@...china.com
Subject: Re: [PATCH] ext4: add KERN_<LEVEL> for printk()

On Wed, 2022-05-25 at 05:48 -0700, Yu Zhe wrote:
> printk() should include KERN_<LEVEL> facility level, add them.

NACK.

checkpatch is just a guide.

You have to inspect the code to determine if what checkpatch emits
should be followed or ignored.

> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
[]
> @@ -628,7 +628,7 @@ static struct stats dx_show_leaf(struct inode *dir,
>  	char *base = (char *) de;
>  	struct dx_hash_info h = *hinfo;
>  
> -	printk("names: ");
> +	printk(KERN_WARNING "names: ");
>  	while ((char *) de < base + size)
>  	{
>  		if (de->inode)
> @@ -648,7 +648,7 @@ static struct stats dx_show_leaf(struct inode *dir,
>  					/* Directory is not encrypted */
>  					ext4fs_dirhash(dir, de->name,
>  						de->name_len, &h);
> -					printk("%*.s:(U)%x.%u ", len,
> +					printk(KERN_WARNING "%*.s:(U)%x.%u ", len,

_might_ use KERN_CONT, 

>  					       name, h.hash,
>  					       (unsigned) ((char *) de
>  							   - base));
> @@ -683,7 +683,7 @@ static struct stats dx_show_leaf(struct inode *dir,
>  					else
>  						ext4fs_dirhash(dir, de->name,
>  						       de->name_len, &h);
> -					printk("%*.s:(E)%x.%u ", len, name,
> +					printk(KERN_WARNING "%*.s:(E)%x.%u ", len, name,

and here, etc...

[]

> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
[]
> @@ -941,9 +941,9 @@ void __ext4_msg(struct super_block *sb,
>  	vaf.fmt = fmt;
>  	vaf.va = &args;
>  	if (sb)
> -		printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
> +		printk(KERN_WARNING "%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);

You broke the logging here.

Did you check what prefix is and how it is used in ext4_msg ?

>  	else
> -		printk("%sEXT4-fs: %pV\n", prefix, &vaf);
> +		printk(KERN_WARNING "%sEXT4-fs: %pV\n", prefix, &vaf);
>  	va_end(args);
>  }
>