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Signed-off-by: Gregory Price > Acked-by: Mike Rapoport (Microsoft) > Acked-by: David Hildenbrand > --- > drivers/acpi/numa/srat.c | 12 +++++++++++- > 1 file changed, 11 insertions(+), 1 deletion(-) > > diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c > index 44f91f2c6c5d..34b6993e7d6c 100644 > --- a/drivers/acpi/numa/srat.c > +++ b/drivers/acpi/numa/srat.c > @@ -14,6 +14,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -338,13 +339,22 @@ static int __init acpi_parse_cfmws(union acpi_subtable_headers *header, > { > struct acpi_cedt_cfmws *cfmws; > int *fake_pxm = arg; > - u64 start, end; > + u64 start, end, align; > int node; > > cfmws = (struct acpi_cedt_cfmws *)header; > start = cfmws->base_hpa; > end = cfmws->base_hpa + cfmws->window_size; > > + /* Align memblock size to CFMW regions if possible */ > + align = 1UL << __ffs(start | end); > + if (align >= SZ_256M) { > + if (memory_block_advise_max_size(align) < 0) > + pr_warn("CFMWS: memblock size advise failed\n"); Oh, this made me go back to look at what happens if CFMWS has multiple alignment suggestions. Should not memory_block_advise_max_size() be considering the max advice? if (memory_block_advised_size) { ... } else { memory_block_advised_size = max(memory_block_advised_size, size); } For example, if region0 is an x4 region and region1 is an x1 region then the memory block size should be 1GB, not 256M. I.e. CFMWS alignment follows CXL hardware decoder alignment of "256M * InterleaveWays".