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

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Date:	Mon, 28 Oct 2013 15:13:10 +0100
From:	Simon Baatz <gmbnomis@...il.com>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Will Deacon <will.deacon@....com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	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 07:51:15PM +0800, Ming Lei wrote:
> diff --git a/lib/scatterlist.c b/lib/scatterlist.c
> index a685c8a..eea8806 100644
> --- a/lib/scatterlist.c
> +++ b/lib/scatterlist.c
> @@ -577,7 +577,7 @@ void sg_miter_stop(struct sg_mapping_iter *miter)
>  		miter->__offset += miter->consumed;
>  		miter->__remaining -= miter->consumed;
>  
> -		if (miter->__flags & SG_MITER_TO_SG)
> +		if ((miter->__flags & SG_MITER_TO_SG) && !PageSlab(page))

This is what I was going to propose, but I would have used
!PageSlab(miter->page) ;-)

>  			flush_kernel_dcache_page(miter->page);

With this, a kernel with DEBUG_VM now boots on Kirkwood. 


- Simon
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