linux-kernel - Re: ARM/kirkwood: v3.12-rc6: kernel BUG at mm/util.c:390!

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Message-ID: <20131027134718.GC16735@n2100.arm.linux.org.uk>
Date:	Sun, 27 Oct 2013 13:47:19 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Tejun Heo <tj@...nel.org>
Cc:	Ming Lei <tom.leiming@...il.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Will Deacon <will.deacon@....com>,
	Simon Baatz <gmbnomis@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: ARM/kirkwood: v3.12-rc6: kernel BUG at mm/util.c:390!

On Sun, Oct 27, 2013 at 09:42:57AM -0400, Tejun Heo wrote:
> On Sun, Oct 27, 2013 at 09:16:53PM +0800, Ming Lei wrote:
> > On Sun, Oct 27, 2013 at 8:50 PM, Aaro Koskinen <aaro.koskinen@....fi> wrote:
> > >
> > > On ARM v3.9 or older kernels do not trigger this BUG, at seems it only
> > > started to appear with the following commit (bisected):
> > >
> > > commit 1bc39742aab09248169ef9d3727c9def3528b3f3
> > > Author: Simon Baatz <gmbnomis@...il.com>
> > > Date:   Mon Jun 10 21:10:12 2013 +0100
> > >
> > >     ARM: 7755/1: handle user space mapped pages in flush_kernel_dcache_page
> > 
> > The above commit only starts to implement the helper on ARM,
> > but according to Documentation/cachetlb.txt, looks caller of
> > flush_kernel_dcache_page() should make sure the passed
> > 'page' is a user space page.
> 
> I don't think PageSlab() is the right test tho.  Wouldn't testing
> against user_addr_max() make more sense?

How does that help for a function passed a struct page pointer?
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