On Mon, Oct 28, 2019 at 01:58:52PM +0000, Steven Price wrote: > walk_page_range() is going to be allowed to walk page tables other than > those of user space. For this it needs to know when it has reached a > 'leaf' entry in the page tables. This information will be provided by the > p?d_leaf() functions/macros. > > For arm64, we already have p?d_sect() macros which we can reuse for > p?d_leaf(). > > pud_sect() is defined as a dummy function when CONFIG_PGTABLE_LEVELS < 3 > or CONFIG_ARM64_64K_PAGES is defined. However when the kernel is > configured this way then architecturally it isn't allowed to have a > large page at this level, and any code using these page walking macros > is implicitly relying on the page size/number of levels being the same as > the kernel. So it is safe to reuse this for p?d_leaf() as it is an > architectural restriction. > > CC: Catalin Marinas <catalin.marinas@xxxxxxx> > CC: Will Deacon <will@xxxxxxxxxx> > Signed-off-by: Steven Price <steven.price@xxxxxxx> I can see akpm picked these patches already. FWIW: Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
