linux-kernel - Re: [LKP] [mm] cc87317726f: WARNING: CPU: 0 PID: 1atdrivers/iommu/io-pgtable-arm.c:413 __arm_lpae

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Message-ID: <20150320133820.GB4821@dhcp22.suse.cz>
Date:	Fri, 20 Mar 2015 14:38:20 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	ying.huang@...el.com, hannes@...xchg.org,
	torvalds@...ux-foundation.org, rientjes@...gle.com,
	akpm@...ux-foundation.org, david@...morbit.com,
	linux-kernel@...r.kernel.org, lkp@...org, linux-mm@...ck.org
Subject: Re: [LKP] [mm] cc87317726f: WARNING: CPU: 0 PID:
 1atdrivers/iommu/io-pgtable-arm.c:413 __arm_lpae_unmap+0x341/0x380()

On Fri 20-03-15 22:34:21, Tetsuo Handa wrote:
> Huang Ying wrote:
> > > > BTW: the test is run on 32 bit system.
> > > 
> > > That sounds like the cause of your problem. The system might be out of
> > > address space available for the kernel (only 1GB if x86_32). You should
> > > try running tests on 64 bit systems.
> > 
> > We run test on 32 bit and 64 bit systems.  Try to catch problems on both
> > platforms.  I think we still need to support 32 bit systems?
> 
> Yes, testing on both platforms is good. But please read
> http://lwn.net/Articles/627419/ , http://lwn.net/Articles/635354/ and
> http://lwn.net/Articles/636017/ . Then please add __GFP_NORETRY to memory
> allocations in btrfs code if it is appropriate.

I guess you meant __GFP_NOFAIL?

-- 
Michal Hocko
SUSE Labs
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