From mboxrd@z Thu Jan  1 00:00:00 1970
From: jsitnicki@gmail.com (Jakub Sitnicki)
Date: Wed, 27 Apr 2016 22:26:26 +0200
Subject: unable to find function definition
In-Reply-To: <2cab8174b247724af07b444437ee423c@sillymon.ch>
References: <loom.20160420T080948-650@post.gmane.org>
	<20160420072625.GA27201@portege.ulakbim.gov.tr>
	<CAOsEZoi==uBocmEFpi2N9BteDWrf_7_PxmwDpbFXo9zngjHXrQ@mail.gmail.com>
	<CAKJ7aR60S=hxDPQ=nZG7dbT2zhgo5Y1_dq+DiHk-26LUAxS2fA@mail.gmail.com>
	<2cab8174b247724af07b444437ee423c@sillymon.ch>
Message-ID: <87oa8u4x3h.fsf@frog.home>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

On Tue, Apr 26, 2016 at 12:45 PM CEST, Silvan Jegen <me@sillymon.ch> wrote:
> Am 2016-04-26 10:50, schrieb Gadre Nayan:
>> Ctags can help. Ctags -R on the entire source.
>
> In the Kernel Makefile there is actually a target for this. It's called 
> either 'tags' or 'tag' so
>
> make tags [or tag]
>
> should create the ctag file for you.

An alternative would be to use cscope:

$ # build the index (will take a moment)
$ make cscope
$ # find all assignments to a symbol
$ cscope -d -L -9 platform_gpio_blink_set
drivers/leds/leds-gpio.c <global> 130 led_dat->platform_gpio_blink_set = blink_set;
$ # or find all occurrences of a symbol and grep for assignments
$ cscope -d -L -0 platform_gpio_blink_set | grep =
drivers/leds/leds-gpio.c <global> 130 led_dat->platform_gpio_blink_set = blink_set;

The latter, for some reason, runs faster for me.

-Jakub