linux-kernel - Re: [PATCH] checkpatch: prefer dev_<level>( to dev_printk(KERN

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Date:	Wed, 2 Jan 2013 18:34:41 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Whitcroft <apw@...onical.com>,
	Lance Ortiz <lance.ortiz@...com>, lance_ortiz@...mail.com,
	jiang.liu@...wei.com, tony.luck@...el.com, bp@...en8.de,
	rostedt@...dmis.org, mchehab@...hat.com,
	linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] checkpatch: prefer dev_<level>( to dev_printk(KERN_<LEVEL>

On Wed, Jan 2, 2013 at 6:06 PM, Joe Perches <joe@...ches.com> wrote:
> Add YA check to printk style.
>
> dev_<level> uses are functions and generate smaller
> object code than dev_printk(KERN_<LEVEL>.
>
> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
>  scripts/checkpatch.pl | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 4d2c7df..f50b32d 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2430,6 +2430,16 @@ sub process {
>                              "Prefer pr_warn(... to pr_warning(...\n" . $herecurr);
>                 }
>
> +               if ($line =~ /\bdev_printk\s*\(\s*KERN_([A-Z]+)/) {
> +                       my $orig = $1;
> +                       my $level = lc($orig);
> +                       $level = "warn" if ($level eq "warning");
> +                       my $level2 = $level;
> +                       $level2 = "dbg" if ($level eq "debug");
> +                       WARN("PREFER_DEV_LEVEL",
> +                            "Prefer dev_$level2(... to dev_printk(KERN_$orig, ...\n" . $herecurr);

This suggests dev_dbg() instead of dev_printk(KERN_DEBUG), doesn't it?
 Those aren't equivalent (dev_printk() always does the printk, but in
many cases dev_dbg() does not, depending on CONFIG_DEBUG,
CONFIG_DYNAMIC_DEBUG, etc.)

> +               }
> +
>  # function brace can't be on same line, except for #defines of do while,
>  # or if closed on same line
>                 if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and
>
>
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