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

[Russell King - ARM Linux]

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@xxxxxx> 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@xxxxxxxxx>
> > > 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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