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kKm0CFR8gI5wJOIgqd+R5qswOBmyZpk0OsbB7LXXDgTYF555r+fEXWvej2UPMPIXwXfUhocStYHrtQlKRL+iU7SVSMVeZONRluiOQywzux1Z7mzsWSRvL0D+/RNNXZnK8BY5rZr84mlUtSmz1WVP/9MlBxrI76f4Lr4XVj5jgxnXjEfZcleX6AHKHqkypKXBj7k3RQuwllKBS07dhtxwsX3dzgywsR00hhxDQJkvYoeOqguWZ6juJ93lEZ1VClMqZdmNNFujEtKoJbCtXfPn1LcEtZF0P7QSugzIOslU3skkKh2G1yM6VAcztimxCW3DvTu4pU1HjSe6uGevDTHYTzwi9ElSmsWITFzJc/cG+4JQU7J5tVS+6G3EiPIfOI4/5ALobYfCx/M9W292J0YfzBujtY322O9IyITKUjH5h1Zi+vhUiVTdUm9edwf0yWlecd79NQfxUfrzTIcFi+8TLf3KfxQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Mike Rapoport wrote: > From: "Mike Rapoport (Microsoft)" > > Hi, > > Following the discussion about handling of CXL fixed memory windows on > arm64 [1] I decided to bite the bullet and move numa_memblks from x86 to > the generic code so they will be available on arm64/riscv and maybe on > loongarch sometime later. > > While it could be possible to use memblock to describe CXL memory windows, > it currently lacks notion of unpopulated memory ranges and numa_memblks > does implement this. > > Another reason to make numa_memblks generic is that both arch_numa (arm64 > and riscv) and loongarch use trimmed copy of x86 code although there is no > fundamental reason why the same code cannot be used on all these platforms. > Having numa_memblks in mm/ will make it's interaction with ACPI and FDT > more consistent and I believe will reduce maintenance burden. > > And with generic numa_memblks it is (almost) straightforward to enable NUMA > emulation on arm64 and riscv. Hey Mike, So interesting to see this come full circle and instead of moving numa_memblks to memblock, just uplevel numa_memblks. From the perspective of having numa_memblks enhancements work for more architectures this gets an enthusiastic thumbs up from me. Let me go look at the details...