Re: [PATCH] mm/zsmalloc: include sparsemem.h for MAX_PHYSMEM_BITS

[Arnd Bergmann]

On Tue, Nov 10, 2020 at 5:21 PM Mike Rapoport <rppt@xxxxxxxxxx> wrote:
> On Tue, Nov 10, 2020 at 12:21:11PM +0100, Arnd Bergmann wrote:
> >
> > To be on the safe side, we could provoke a compile-time error
> > when CONFIG_PHYS_ADDR_T_64BIT is set on a 32-bit
> > architecture, but MAX_POSSIBLE_PHYSMEM_BITS is not set.
>
> Maybe compile time warning and a runtime error in zs_init() if 32 bit
> machine has memory above 4G?

If the fix is as easy as adding a single line in a header, I think a
compile-time
error makes it easier, no need to wait for someone to boot a broken
system before fixing it.

       Arnd