On Fri, Apr 29, 2016 at 07:08:55PM +0300, Yury Norov wrote:

On Fri, Apr 29, 2016 at 05:03:34PM +0100, Catalin Marinas wrote:

quoted

On Wed, Apr 06, 2016 at 01:08:47AM +0300, Yury Norov wrote:

quoted

+config ARM64_ILP32
+	bool "Kernel support for ILP32"
+	select COMPAT_WRAPPER
+	help
+	  This option enables support for AArch64 ILP32 user space.  ILP32
+	  is an ABI where long and pointers are 32bits but it uses the AARCH64
+	  instruction set.

Is there any penalty for AArch32 tasks when selecting COMPAT_WRAPPER?

No. AARCH32 doesn't define __SC_WRAP and so __SYSCALL macro is used,
which fills syscall table with sys_xxx versions, not compat_sys_xxx.

Ah, I forgot it has its own unistd32.h.

Thanks.

-- 
Catalin