On Tue, Dec 10, 2024 at 5:06 PM Arnd Bergmann <arnd@xxxxxxxxxx> wrote: > From: Arnd Bergmann <arnd@xxxxxxxx> > > CONFIG_HIGHPTE was added in linux-2.6.32, a few years before 64-bit > support. At the time it made sense, as the CONFIG_ARM_LPAE option allowed > systems with 16GB of memory that made lowmem a particularly scarce > resource, and the HIGHPTE implementation gave feature parity with 32-bit > x86 and frv machines. > > Since Arm is the last architecture remaining that uses this, and almost > no 32-bit machines support more than 4GB of RAM, the cost of continuing > to maintain HIGHPTE seems unjustified, so remove it here to allow > simplifying the generic page table handling. > > Link: https://lore.kernel.org/lkml/20241204103042.1904639-8-arnd@xxxxxxxxxx/T/#u > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> I'm in favor of this if the x86 patch goes in. We need to get rid of highmem anyway and this will need to happen sooner or later either way. Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Yours, Linus Walleij
