Date: Fri, 21 Nov 2014 21:16:58 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
cc: Andy Lutomirski <luto@amacapital.net>,
        Steven Rostedt <rostedt@goodmis.org>, Tejun Heo <tj@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
        Peter Zijlstra <peterz@infradead.org>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Don Zickus <dzickus@redhat.com>, Dave Jones <davej@redhat.com>,
        the arch/x86 maintainers <x86@kernel.org>
Subject: Re: frequent lockups in 3.18rc4
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On Fri, 21 Nov 2014, Linus Torvalds wrote:

> On Fri, Nov 21, 2014 at 11:51 AM, Thomas Gleixner <tglx@linutronix.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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