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SubjectRe: [PATCH v5 02/24] mm: remove extra ZONE_DEVICE struct page refcount
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On 1/28/22 06:21, Jason Gunthorpe wrote:
> On Thu, Jan 27, 2022 at 05:25:52PM -0700, Logan Gunthorpe wrote:
>> From: Ralph Campbell <rcampbell@nvidia.com>
>>
>> ZONE_DEVICE struct pages have an extra reference count that complicates the
>> code for put_page() and several places in the kernel that need to check the
>> reference count to see that a page is not being used (gup, compaction,
>> migration, etc.). Clean up the code so the reference count doesn't need to
>> be treated specially for ZONE_DEVICE.
>>
>> [logang: dropped no longer used section from mm.h including
>> page_is_devmap_managed, rebased on v5.17-rc1 (possibly poorly)]
>> Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
>> Signed-off-by: Alex Sierra <alex.sierra@amd.com>
>> Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
>> Reviewed-by: Christoph Hellwig <hch@lst.de>
>> ---
>> arch/powerpc/kvm/book3s_hv_uvmem.c | 2 +-
>> drivers/gpu/drm/nouveau/nouveau_dmem.c | 2 +-
>> fs/dax.c | 4 +-
>> include/linux/dax.h | 2 +-
>> include/linux/memremap.h | 7 +--
>> include/linux/mm.h | 44 ----------------
>> lib/test_hmm.c | 2 +-
>> mm/internal.h | 8 +++
>> mm/memcontrol.c | 6 +--
>> mm/memremap.c | 70 +++++++-------------------
>> mm/migrate.c | 5 --
>> mm/page_alloc.c | 3 ++
>> mm/swap.c | 45 ++---------------
>> 13 files changed, 46 insertions(+), 154 deletions(-)
> This patch still can't be applied until the FSDAX issues are solved,
> right? See my remarks the last time it was posted..
>
> Jason

That is my understanding too.

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