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>>  } >>   >> -// This PMU reservation size is r570-specific. >> +/// PMU backing store. >> +const PMU_BACKING_STORE_SIZE: usize = 9 * SZ_1M; > > I don't see this comment or value removed/changed in this patchset, so is it really 570- > specific? Yes, it was r570-specific, and this patch is where it changes: the hunk removes the comment and replaces the value. In 570.144 the PMU region is: * 8 MiB of backing store * 16 MiB of surfaces * 4 KiB of miscellaneous memory * all aligned to 128 KiB. In 615.71.09 the backing store is 9 MiB and the surfaces are 16 MiB + 256 KiB. (v4 adds the before and after sizes to the commit message.) thanks, -- John Hubbard