Hi Suzuki On 5/24/2018 4:44 PM, Suzuki K Poulose Wrote: > On 14/05/18 10:45, Suzuki K Poulose wrote: >> On 10/05/18 00:31, Andrew Morton wrote: >>> On Fri, 4 May 2018 11:11:46 +0800 Jia He <hejianet@xxxxxxxxx> wrote: >>> >>>> In our armv8a server(QDF2400), I noticed lots of WARN_ON caused by PAGE_SIZE >>>> unaligned for rmap_item->address under memory pressure tests(start 20 guests >>>> and run memhog in the host). >>>> >>>> ... >>>> >>>> In rmap_walk_ksm, the rmap_item->address might still have the STABLE_FLAG, >>>> then the start and end in handle_hva_to_gpa might not be PAGE_SIZE aligned. >>>> Thus it will cause exceptions in handle_hva_to_gpa on arm64. >>>> >>>> This patch fixes it by ignoring(not removing) the low bits of address when >>>> doing rmap_walk_ksm. >>>> >>>> Signed-off-by: jia.he@xxxxxxxxxxxxxxxx >>> >>> I assumed you wanted this patch to be committed as >>> From:jia.he@xxxxxxxxxxxxxxxx rather than From:hejianet@xxxxxxxxx, so I >>> made that change. Please let me know if this was inappropriate. >>> >>> You can do this yourself by adding an explicit From: line to the very >>> start of the patch's email text. >>> >>> Also, a storm of WARN_ONs is pretty poor behaviour. Is that the only >>> misbehaviour which this bug causes? Do you think the fix should be >>> backported into earlier kernels? >>> > > > Jia, Andrew, > > What is the status of this patch ? > > Suzuki I thought the patch is merged into mmotm tree. http://www.ozlabs.org/~akpm/mmotm/series But I don't know what is the next step. Cheers, Jia
