On 12/5/19 5:04 PM, Daniel Axtens wrote: > apply_to_page_range takes an address range, and if any parts of it > are not covered by the existing page table hierarchy, it allocates > memory to fill them in. > > In some use cases, this is not what we want - we want to be able to > operate exclusively on PTEs that are already in the tables. > > Add apply_to_existing_pages for this. Adjust the walker functions > for apply_to_page_range to take 'create', which switches them between > the old and new modes. > > This will be used in KASAN vmalloc. > > Signed-off-by: Daniel Axtens <dja@xxxxxxxxxx> Reviewed-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
