On Sat, 7 Nov 2020 16:22:06 +0100 Stefan Agner <stefan@xxxxxxxx> wrote: > Most architectures define MAX_PHYSMEM_BITS in asm/sparsemem.h and don't > include it in asm/pgtable.h. Include asm/sparsemem.h directly to get > the MAX_PHYSMEM_BITS define on all architectures. > > This fixes a crash when accessing zram on 32-bit ARM platform with LPAE and > more than 4GB of memory: > Unable to handle kernel NULL pointer dereference at virtual address 00000000 Mysterious. Presumably without this include, some compilation unit is picking up the wrong value of MAX_PHYSMEM_BITS? But I couldn't actually see where/how this occurs. Can you please explain further?
