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Re: [GIT, RFC] Killing the Big Kernel Lock

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From: Frederic Weisbecker
Subject: Re: [GIT, RFC] Killing the Big Kernel Lock
Date: Sunday, March 28, 2010 - 1:33 pm

On Thu, Mar 25, 2010 at 11:26:56AM +0100, Arnd Bergmann wrote:


Yeah, the comment gives this:

	/*
	 * This lock_kernel fixes a subtle race with suid exec
	 */

But there is no lock_kernel() in the exec path, may be I missed it...
so this may be an old lock_kernel() that doesn't exist anymore, and
the bkl in the ptrace path is not going to help in any way.

What remain to check are the possible unintended racy places that
this bkl might protect.

I'm going to check a first pass and if it looks fine, I'll just submit
to Oleg and Roland.

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Messages in current thread:
Re: [GIT, RFC] Killing the Big Kernel Lock, Andrew Morton, (Wed Mar 24, 2:07 pm)
[GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Wed Mar 24, 2:40 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Roland Dreier, (Wed Mar 24, 2:53 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Wed Mar 24, 2:59 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Alan Cox, (Wed Mar 24, 3:10 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Ingo Molnar, (Wed Mar 24, 3:23 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Wed Mar 24, 3:25 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Thu Mar 25, 3:26 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, Jiri Kosina, (Thu Mar 25, 5:55 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Thu Mar 25, 6:06 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Thu Mar 25, 6:38 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, Dan Carpenter, (Thu Mar 25, 6:40 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Thu Mar 25, 7:14 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, Stefan Richter, (Fri Mar 26, 4:47 pm)
[PATCH] firewire: char device files are not seekable (BKL ..., Stefan Richter, (Sat Mar 27, 2:16 am)
[PATCH] ieee1394: char device files are not seekable (BKL ..., Stefan Richter, (Sat Mar 27, 2:20 am)
[PATCH RFC] DVB: add dvb_generic_nonseekable_open, dvb_gen ..., Stefan Richter, (Sat Mar 27, 3:40 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Sat Mar 27, 7:37 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, Stefan Richter, (Sun Mar 28, 5:27 am)
[PATCH RFC v2] DVB: add dvb_generic_nonseekable_open, dvb_ ..., Stefan Richter, (Sun Mar 28, 7:47 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, Frederic Weisbecker, (Sun Mar 28, 1:04 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Sun Mar 28, 1:05 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Frederic Weisbecker, (Sun Mar 28, 1:11 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Frederic Weisbecker, (Sun Mar 28, 1:15 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Frederic Weisbecker, (Sun Mar 28, 1:33 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Sun Mar 28, 2:34 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Andi Kleen, (Sun Mar 28, 2:58 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Frederic Weisbecker, (Sun Mar 28, 4:18 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Frederic Weisbecker, (Sun Mar 28, 4:24 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Frederic Weisbecker, (Sun Mar 28, 4:38 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock II, Andi Kleen, (Sun Mar 28, 6:07 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Mon Mar 29, 4:04 am)
Re: [GIT, RFC] Killing the Big Kernel Lock II, Arnd Bergmann, (Mon Mar 29, 4:48 am)
Re: [GIT, RFC] Killing the Big Kernel Lock II, Andi Kleen, (Mon Mar 29, 5:30 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, John Kacur, (Mon Mar 29, 5:45 am)
Re: [GIT, RFC] Killing the Big Kernel Lock II, Arnd Bergmann, (Mon Mar 29, 7:43 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, Frederic Weisbecker, (Mon Mar 29, 10:59 am)
Re: [GIT, RFC] Killing the Big Kernel Lock II, Andi Kleen, (Mon Mar 29, 1:11 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Mon Mar 29, 2:18 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Roland Dreier, (Tue Mar 30, 10:22 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Roland Dreier, (Wed Mar 31, 3:11 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Frederic Weisbecker, (Wed Mar 31, 3:20 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Thu Apr 1, 1:50 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, Jan Blunck, (Thu Apr 8, 1:45 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Arnd Bergmann, (Thu Apr 8, 2:27 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Frederic Weisbecker, (Thu Apr 8, 2:30 pm)
Re: [GIT, RFC] Killing the Big Kernel Lock, Jan Blunck, (Fri Apr 9, 4:02 am)
Re: [GIT, RFC] Killing the Big Kernel Lock, Stefan Richter, (Sat Apr 10, 8:13 am)