Re: [LKP] [mm] cc87317726f: WARNING: CPU: 0 PID: 1atdrivers/iommu/io-pgtable-arm.c:413 __arm_lpae_unmap+0x341/0x380()

[Tetsuo Handa]

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.
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