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For example, CXL memory > extents can be 256MB with a matching alignment. If this size/alignment > is smaller than the block size, it can result in stranded capacity. > > Implement memory_block_advise_max_size for use prior to allocator init, > for software to advise the system on the max block size. > > Implement memory_block_probe_max_size for use by arch init code to > calculate the best block size. Use of advice is architecture defined. > > The probe value can never change after first probe. Calls to advise > after probe will return -EBUSY to aid debugging. > > On systems without hotplug, always return -ENODEV and 0 respectively. > > Suggested-by: Ira Weiny > Signed-off-by: Gregory Price > Acked-by: David Hildenbrand > Acked-by: Mike Rapoport (Microsoft) > Acked-by: Dan Williams > Tested-by: Fan Ni > --- [snip] > +int __init memory_block_advise_max_size(unsigned long size) > +{ > + if (!size || !is_power_of_2(size)) > + return -EINVAL; > + > + if (memory_block_advised_size_queried) > + return -EBUSY; > + > + if (memory_block_advised_size) { > + memory_block_advised_size = min(memory_block_advised_size, > + size); > + } else { > + memory_block_advised_size = size; > + } NIT: Style: single statements don't need '{}' Other than that it looks ok. Reviewed-by: Ira Weiny [snip]