On Thu, Jan 20, 2022 at 8:39 AM <guoren@xxxxxxxxxx> wrote: > > From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx> > > Make TASK_SIZE from const to dynamic detect TIF_32BIT flag > function. Refer to arm64 to implement DEFAULT_MAP_WINDOW_64 for > efi-stub. > > Limit 32-bit compatible process in 0-2GB virtual address range > (which is enough for real scenarios), because it could avoid > address sign extend problem when 32-bit enter 64-bit and ease > software design. > > The standard 32-bit TASK_SIZE is 0x9dc00000:FIXADDR_START, and > compared to a compatible 32-bit, it increases 476MB for the > application's virtual address. > > Signed-off-by: Guo Ren <guoren@xxxxxxxxxxxxxxxxx> > Signed-off-by: Guo Ren <guoren@xxxxxxxxxx> > Cc: Arnd Bergmann <arnd@xxxxxxxx> Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>
