Hi, On Thu, Nov 11, 2021 at 03:33:29PM +0800, Mark-PK Tsai wrote: > Hi, > > The lts kernel also have this issue. (we use 5.4-lts kernel.) > Currently we patch our custom kernel to select CONFIG_HOLES_IN_ZONE for arch arm. > But I think the formal solution should backport to lts. > > Would you help to backport this patch series? (including the below commit) There were a couple of changes between 5.4 and this set, so you'd need to "apply" the first two patches to arm::free_unused_memmap(). Other than that, I don't see any pitfalls here. Feel free to CC me when you post the backported series. > (024591f9a6e0 arm: ioremap: don't abuse pfn_valid() to check if pfn is in RAM) > > Thanks! -- Sincerely yours, Mike.
