linux-kernel - Re: [GIT PATCH] TTY patches for 2.6.33-git

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Date:	Sun, 13 Dec 2009 19:17:26 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT PATCH] TTY patches for 2.6.33-git


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 
> 
> On Sun, 13 Dec 2009, Ingo Molnar wrote:
> > 
> > In the last ~4.5 years:
> > 
> >  earth4:~/tip> git checkout v2.6.12
> >  Date:   Fri Jun 17 12:48:29 2005 -0700
> >  earth4:~/tip> git grep -w unlock_kernel | wc -l
> >  713
> > 
> >  earth4:~/tip> git checkout linus
> >  Date:   Fri Dec 11 20:58:20 2009 -0800
> >  earth4:~/tip> git grep -w unlock_kernel | wc -l
> >  841
> 
> Git hint of the day: you don't need to check out a kernel to do "git 
> grep".
> 
> Do this:
> 
> 	git grep -w unlock_kernel v2.6.12 | wc
> 
> and it will JustWork(tm).

/me adds it to the metal toolbox

> > Also, a lot of BKL use was hidden before, and due to the BKL removal 
> > activities (by Thomas, Frederic, Jon, Alan and others) the remaining BKL using 
> > sites are a lot more well defined, a lot more isolated and thus a lot more 
> > removable than ever before.
> 
> That's the main thing. We've been pushing them down a lot.
> 
> We still have a few annoying core ones, though. I hate the execve() and file 
> locking ones.

When we did the BKL-as-a-mutex trick and let lockdep loose on it, three areas 
were particularly tricky: tty, reiser3 and NFS. tty and reiserfs should be ok 
now, but i havent seen much activity on the NFS front.

	Ingo
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