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

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Message-ID: <CACVXFVP2B3=82m_+DfA_oAEW86c=oxQ52G+yj5ncTU1DzP26Bw@mail.gmail.com>
Date:	Sun, 27 Oct 2013 21:16:53 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Aaro Koskinen <aaro.koskinen@....fi>
Cc:	Will Deacon <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	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>,
	Tejun Heo <tj@...nel.org>,
	"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 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.

Thanks,
-- 
Ming Lei
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