Linux - Revision history

Savoundg at 17:09, 30 May 2018

2018-05-30T17:09:23Z

← Older revision		Revision as of 17:09, 30 May 2018
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	== Compilation ==		=== Kernel configuration with sysctl ===
			You can either write to the /proc/sys/ file as follow<syntaxhighlight lang="shell">
			echo foo > /proc/sys/bar/file
			</syntaxhighlight>Or, you can also use sysctl:<syntaxhighlight lang="bash">
			sysctl bar.file=foo
			</syntaxhighlight>

			=== Compilation ===

	=== Install modules to the root file systems ===		==== Install modules to the root file systems ====
	<syntaxhighlight lang="console">		<syntaxhighlight lang="console">
	# make INSTALL_MOD_PATH=/path/to/root make modules_install		# make INSTALL_MOD_PATH=/path/to/root make modules_install
	</syntaxhighlight>		</syntaxhighlight>

	== Debugging techniques ==		=== Debugging techniques ===

	=== Get the name of the calling function<ref>http://stackoverflow.com/a/4145666</ref>===		==== Get the name of the calling function<ref>http://stackoverflow.com/a/4145666</ref>====
	<syntaxhighlight lang="c">		<syntaxhighlight lang="c">
	printk("%s: Caller is %pS\n", __func__, __builtin_return_address(0));		printk("%s: Caller is %pS\n", __func__, __builtin_return_address(0));
	</syntaxhighlight>		</syntaxhighlight>

	=== Get the name of a symbol from its address ===		==== Get the name of a symbol from its address ====
	<syntaxhighlight lang="c">		<syntaxhighlight lang="c">
	#include <linux/kallsyms.h>		#include <linux/kallsyms.h>
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	</syntaxhighlight>		</syntaxhighlight>

	=== Debug with printk and DYNAMIC_DEBUG ===		==== Debug with printk and DYNAMIC_DEBUG ====
	The kernel should be compiled with '''CONFIG_DYNAMIC_DEBUG'''.		The kernel should be compiled with '''CONFIG_DYNAMIC_DEBUG'''.

Savoundg: /* Debugging techniques */

2017-04-05T00:50:18Z

Debugging techniques

← Older revision		Revision as of 00:50, 5 April 2017
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	</syntaxhighlight>		</syntaxhighlight>

	=== Get the name of a ~~symbole~~ from its address ===		=== Get the name of a symbol from its address ===
	<syntaxhighlight lang="c">		<syntaxhighlight lang="c">
	#include <linux/kallsyms.h>		#include <linux/kallsyms.h>
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	print_symbol("%s\n", symbol_address);		print_symbol("%s\n", symbol_address);
	</syntaxhighlight>		</syntaxhighlight>

			=== Debug with printk and DYNAMIC_DEBUG ===
			The kernel should be compiled with '''CONFIG_DYNAMIC_DEBUG'''.

			In the debugfs folder, the debug traces can be dynamically enabled, disabled and configured as follow:

			To enable the debug traces in the file ''drivers/media/foo.c'' in the function ''my_function'':

			echo file drivers/media/foo.c func my_function +p > /sys/kernel/debug/dynamic_debug/control

			The granularity can go from the ''file'' or the ''module'' to the ''line''.

	== Resources ==		== Resources ==

Savoundg: /* Get the name of a symbole from its address */

2016-08-09T23:51:25Z

Get the name of a symbole from its address

← Older revision		Revision as of 23:51, 9 August 2016
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	=== Get the name of a symbole from its address ===		=== Get the name of a symbole from its address ===
	<syntaxhighlight lang="c">		<syntaxhighlight lang="c">
			#include <linux/kallsyms.h>

	print_symbol("%s\n", symbol_address);		print_symbol("%s\n", symbol_address);
	</syntaxhighlight>		</syntaxhighlight>

Savoundg: Add resources

2016-07-01T18:37:46Z

Add resources

← Older revision		Revision as of 18:37, 1 July 2016
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	print_symbol("%s\n", symbol_address);		print_symbol("%s\n", symbol_address);
	</syntaxhighlight>		</syntaxhighlight>

			== Resources ==
			{\| class="wikitable"
			!
			!
			\|-
			\|Debugging the kernel using Ftrace - part 1
			\|https://lwn.net/Articles/365835/
			\|}

	== References ==		== References ==

Savoundg at 00:33, 28 June 2016

2016-06-28T00:33:16Z

← Older revision		Revision as of 00:33, 28 June 2016
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			== Compilation ==

			=== Install modules to the root file systems ===
			<syntaxhighlight lang="console">
			# make INSTALL_MOD_PATH=/path/to/root make modules_install
			</syntaxhighlight>

	== Debugging techniques ==		== Debugging techniques ==

Savoundg: /* Get the name of the calling functionhttp://stackoverflow.com/a/4145666 */

2016-06-23T20:07:38Z

Get the name of the calling functionhttp://stackoverflow.com/a/4145666

← Older revision		Revision as of 20:07, 23 June 2016
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	=== Get the name of the calling function<ref>http://stackoverflow.com/a/4145666</ref>===		=== Get the name of the calling function<ref>http://stackoverflow.com/a/4145666</ref>===
	<syntaxhighlight lang="c">		<syntaxhighlight lang="c">
	printk("Caller is %pS\n", __builtin_return_address(0));		printk("%s: Caller is %pS\n", __func__, __builtin_return_address(0));
	</syntaxhighlight>		</syntaxhighlight>

Savoundg: /* Get the name of the calling function in the kernel [1] */

2016-06-22T00:33:37Z

Get the name of the calling function in the kernel [1]

← Older revision		Revision as of 00:33, 22 June 2016
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	== Debugging techniques ==		== Debugging techniques ==

	=== Get the name of the calling function ~~in the kernel~~ <ref>http://stackoverflow.com/a/4145666</ref>===		=== Get the name of the calling function<ref>http://stackoverflow.com/a/4145666</ref>===
			<syntaxhighlight lang="c">
			printk("Caller is %pS\n", __builtin_return_address(0));
			</syntaxhighlight>

	=== Get the name of a symbole from its address ===		=== Get the name of a symbole from its address ===

Savoundg: /* Debugging techniques */

2016-06-21T23:53:44Z

Debugging techniques

← Older revision		Revision as of 23:53, 21 June 2016
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	=== Get the name of the calling function in the kernel <ref>http://stackoverflow.com/a/4145666</ref>===		=== Get the name of the calling function in the kernel <ref>http://stackoverflow.com/a/4145666</ref>===

			=== Get the name of a symbole from its address ===
			<syntaxhighlight lang="c">
			print_symbol("%s\n", symbol_address);
			</syntaxhighlight>

	== References ==		== References ==

Savoundg: /* Get the name of the calling function in the kernel omap2_common_pm_late_init */

2016-06-20T17:32:04Z

Get the name of the calling function in the kernel omap2_common_pm_late_init

← Older revision		Revision as of 17:32, 20 June 2016
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	== Debugging techniques ==		== Debugging techniques ==

	=== Get the name of the calling function in the kernel <ref>~~omap2_common_pm_late_init~~</ref>===		=== Get the name of the calling function in the kernel <ref>http://stackoverflow.com/a/4145666</ref>===

	== References ==		== References ==

Savoundg: Created page with "== Debugging techniques == === Get the name of the calling function in the kernel omap2_common_pm_late_init=== == References =="

2016-06-20T17:31:49Z

Created page with "== Debugging techniques == === Get the name of the calling function in the kernel <ref>omap2_common_pm_late_init</ref>=== == References =="

New page

== Debugging techniques ==

=== Get the name of the calling function in the kernel <ref>omap2_common_pm_late_init</ref>===

== References ==