Re: [PATCH] Allow sysrq() via /proc/sys/kernel/magickey

Re: [PATCH] Allow sysrq() via /proc/sys/kernel/magickey

[Jeff Garzik]

Linux Kernel Mailing List wrote:
> ChangeSet 1.1114, 2003/08/25 16:42:57-03:00, m.c.p@wolk-project.de
> 
> 	[PATCH] Allow sysrq() via /proc/sys/kernel/magickey
> 	
> 	Hi Marcelo,
> 	
> 	sysrq() is a good thing to debug things, but unfortunately you need to have
> 	physical access to the keyboard. My company for instance maintains tons of
> 	remote machines and sometimes we need to do sysrq() too, but it's not
> 	possible to do so the remote way.
> 	
> 	Attached patch enables emulation of the Magic SysRq key (Alt-SysRq-key) via
> 	the /proc interface. Just echo the desired character into the file and there
> 	you go.
> 	
> 	Patch from Randy Dunlap!


This patch is completely unneeded and redundant.

2.4.x already has /proc/sysrq-trigger for precisely this purpose.

See fs/proc/proc_misc.c for more details.

	Jeff

Re: [PATCH] Allow sysrq() via /proc/sys/kernel/magickey

[Dave Jones]

On Mon, Aug 25, 2003 at 07:42:57PM +0000, Linux Kernel wrote:
 > ChangeSet 1.1114, 2003/08/25 16:42:57-03:00, m.c.p@wolk-project.de
 > 
 > 	[PATCH] Allow sysrq() via /proc/sys/kernel/magickey
 > 	
 > 	Hi Marcelo,
 > 	
 > 	sysrq() is a good thing to debug things, but unfortunately you need to have
 > 	physical access to the keyboard. My company for instance maintains tons of
 > 	remote machines and sometimes we need to do sysrq() too, but it's not
 > 	possible to do so the remote way.
 > 	
 > 	Attached patch enables emulation of the Magic SysRq key (Alt-SysRq-key) via
 > 	the /proc interface. Just echo the desired character into the file and there
 > 	you go.
 > 	
 > 	Patch from Randy Dunlap!
 > 	
 > 	It's in -wolk for a long time and also in some other kernel tree forks.
 > 	2.5/2.6 has almost the same (/proc/sysrq-trigger)

So why not make this compatible with existing behaviour, and use the
same name ? Seems this is deviating between 2.4 / 2.6 for no good reason.

		Dave

-- 
 Dave Jones     http://www.codemonkey.org.uk