Messages in this thread | | | Subject | Re: [LKP] [mm] cc87317726f: WARNING: CPU: 0 PID: 1atdrivers/iommu/io-pgtable-arm.c:413 __arm_lpae_unmap+0x341/0x380() | From | Tetsuo Handa <> | Date | Fri, 20 Mar 2015 22:34:21 +0900 |
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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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