linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <alpine.DEB.2.11.1411212110320.6439@nanos>
Date:	Fri, 21 Nov 2014 21:16:58 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Andy Lutomirski <luto@...capital.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tejun Heo <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Don Zickus <dzickus@...hat.com>, Dave Jones <davej@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: frequent lockups in 3.18rc4

On Fri, 21 Nov 2014, Linus Torvalds wrote:

> On Fri, Nov 21, 2014 at 11:51 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> >
> > This will break paravirt. set_pgd/set_pmd are paravirt functions.
> 
> I suspect we could use "set_pgd()" here instead of the direct access.
> I didn't want to walk through all the levels to see exactly which
> random op I needed to use.

I don't think that works on 32bit. See the magic in
vmalloc_sync_one().

Thanks,

	tglx



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