On Fri, Apr 29, 2016 at 05:14:46PM +0100, Catalin Marinas wrote: > 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: > > > On Wed, Apr 06, 2016 at 01:08:47AM +0300, Yury Norov wrote: > > > > +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.
Even if it was sharing generic unistd,h, it's OK as well. To use wrappers, you have to enable COMPAT_WRAPPER (which is enabled even if only a single ABI needs it) *and* define __SC_WRAP in corresponding sys_xxx.c, which is individual for each abi, of course. > > -- > Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
