From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Ingo Molnar <mingo@kernel.org>
Cc: Pavel Machek <pavel@ucw.cz>, Colin Cross <ccross@android.com>,
Andrew Morton <akpm@osdl.org>,
lkml <linux-kernel@vger.kernel.org>,
Trond Myklebust <Trond.Myklebust@netapp.com>,
Len Brown <len.brown@intel.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>, Ingo Molnar <mingo@redhat.com>,
"J. Bruce Fields" <bfields@fieldses.org>,
"David S. Miller" <davem@davemloft.net>,
Andrew Morton <akpm@linux-foundation.org>,
Mandeep Singh Baines <msb@chromium.org>,
Paul Walmsley <paul@pwsan.com>, Al Viro <viro@zeniv.linux.org.uk>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Oleg Nesterov <oleg@redhat.com>,
linux-nfs@vger.kernel.org,
Linux PM list <linux-pm@vger.kernel.org>,
netdev <netdev@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Tejun Heo <tj@kernel.org>, Ben Chan <benchan@chromium.org>
Subject: Re: [PATCH 2/2] lockdep: check that no locks held at freeze time
Date: Mon, 6 May 2013 10:55:47 +0200 [thread overview]
Message-ID: <20130506085547.GC13861@dyad.programming.kicks-ass.net> (raw)
In-Reply-To: <20130505091844.GC22239@gmail.com>
On Sun, May 05, 2013 at 11:18:44AM +0200, Ingo Molnar wrote:
> That's the old 32-bit x86 trick to compute 'current' from the kernel stack
> pointer.
>
> It can be done better - for example on platforms with optimized percpu
> variables (x86-64) it looks like this:
Doesn't i386 have all the funny per-cpu stuff too? So the only reason it still
does the fugly stack based thing is because nobody could be arsed to do the
work of converting it.
next prev parent reply other threads:[~2013-05-06 8:57 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-03 21:04 [PATCH 1/2] freezer: add unsafe versions of freezable helpers Colin Cross
2013-05-03 21:04 ` [PATCH 2/2] lockdep: check that no locks held at freeze time Colin Cross
2013-05-04 13:04 ` Pavel Machek
2013-05-04 20:27 ` Colin Cross
2013-05-04 22:57 ` Pavel Machek
2013-05-04 23:49 ` Colin Cross
2013-05-05 0:05 ` Pavel Machek
2013-05-05 0:23 ` Colin Cross
2013-05-05 1:13 ` Pavel Machek
2013-05-05 9:18 ` Ingo Molnar
2013-05-06 8:55 ` Peter Zijlstra [this message]
2013-05-06 12:11 ` Pavel Machek
2013-05-06 14:33 ` Linus Torvalds
2013-05-06 14:42 ` Peter Zijlstra
2013-05-06 19:01 ` Tejun Heo
2013-05-06 19:30 ` Colin Cross
2013-05-06 19:33 ` Tejun Heo
2013-05-06 20:06 ` Rafael J. Wysocki
2013-05-04 13:00 ` [PATCH 1/2] freezer: add unsafe versions of freezable helpers Pavel Machek
2013-05-04 20:23 ` Colin Cross
2013-05-04 22:55 ` Pavel Machek
2013-05-05 9:23 ` Ingo Molnar
2013-05-05 22:12 ` Pavel Machek
2013-05-06 8:50 ` Peter Zijlstra
2013-05-06 10:58 ` Jeff Layton
2013-05-06 10:56 ` Jeff Layton
2013-05-06 19:57 ` Colin Cross
2013-05-06 21:43 ` Jeff Layton
2013-05-06 21:54 ` Colin Cross
2013-05-06 21:58 ` Linus Torvalds
2013-05-06 22:05 ` Jeff Layton
2013-05-06 22:11 ` Colin Cross
2013-05-06 22:14 ` Tejun Heo
2013-05-06 21:59 ` Jeff Layton
2013-05-06 18:55 ` Tejun Heo
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