linux-kernel - Re: automated warning notifications

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Date:	Sat, 16 Jun 2012 15:50:36 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Fengguang Wu <wfg@...ux.intel.com>
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Julia Lawall <julia.lawall@...6.fr>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Pekka Enberg <penberg@...nel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christopher Li <sparse@...isli.org>,
	Josh Triplett <josh@...edesktop.org>,
	Linus Torvalds <torvalds@...970.osdl.org>
Subject: Re: automated warning notifications

On Fri, Jun 15, 2012 at 10:34 PM, Fengguang Wu <wfg@...ux.intel.com> wrote:
> On Fri, Jun 15, 2012 at 02:19:14PM +0300, Dan Carpenter wrote:
>>
>> Probably we could use something like the attached script to print
>> out the line of code which causes the bug and some other script to
>> querry git blame and attach the offending commit?
>
> cat -n $code_file | tail -n +$(($lineno - (($context + 1) / 2))) | head -n $(($context + 1))
>
> That's handy, I'll use it to show the source file context for the
> first error/warning :-)

Well, you can use sed/awk, it will be much shorter:

cat -n drivers/leds/led-triggers.c | sed -ne '224,230p'
   224			struct led_classdev *led_cdev;
   225	
   226			led_cdev = list_entry(entry, struct led_classdev, trig_list);
   227			led_set_brightness(led_cdev, brightness);
   228		}
   229		read_unlock(&trigger->leddev_list_lock);
   230	}

(replace the hard-coded "224,230" with a shell variable)

And if you want to find the offending commit:

git show `git blame drivers/leds/led-triggers.c | awk 'NR==227{print $1}'`
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