On Thu, Jun 18, 2020 at 06:45:30AM +0530, Anshuman Khandual wrote: > Device memory ranges when getting hot added into ZONE_DEVICE, might require > their vmemmap mapping's backing memory to be allocated from their own range > instead of consuming system memory. This prevents large system memory usage > for potentially large device memory ranges. Device driver communicates this > request via vmem_altmap structure. Architecture needs to take this request > into account while creating and tearing down vemmmap mappings. > > This enables vmem_altmap support in vmemmap_populate() and vmemmap_free() > which includes vmemmap_populate_basepages() used for ARM64_16K_PAGES and > ARM64_64K_PAGES configs. > > Cc: Catalin Marinas <catalin.marinas@xxxxxxx> > Cc: Will Deacon <will@xxxxxxxxxx> > Cc: Mark Rutland <mark.rutland@xxxxxxx> > Cc: Steve Capper <steve.capper@xxxxxxx> > Cc: David Hildenbrand <david@xxxxxxxxxx> > Cc: Yu Zhao <yuzhao@xxxxxxxxxx> > Cc: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx > Tested-by: Jia He <justin.he@xxxxxxx> > Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx> This looks fine to me: Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx> I presume this series would go into mainline via the mm tree as it touches several architectures.
