linux-kernel - Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

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Date:	Fri, 29 Apr 2016 16:13:38 +0300
From:	Yury Norov <ynorov@...iumnetworks.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Catalin Marinas <catalin.marinas@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
	<linux-s390@...r.kernel.org>, <pinskia@...il.com>,
	<Prasun.Kapoor@...iumnetworks.com>, <schwab@...e.de>,
	<broonie@...nel.org>, <linux-doc@...r.kernel.org>,
	<heiko.carstens@...ibm.com>, <agraf@...e.de>,
	<klimov.linux@...il.com>,
	Andrew Pinski <Andrew.Pinski@...iumnetworks.com>,
	<bamvor.zhangjian@...wei.com>, Andrew Pinski <apinski@...ium.com>,
	<schwidefsky@...ibm.com>, <Nathan_Lynch@...tor.com>,
	<joseph@...esourcery.com>,
	<christoph.muellner@...obroma-systems.com>
Subject: Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table
 (in entry.S) to use it

On Fri, Apr 29, 2016 at 12:43:41AM +0200, Arnd Bergmann wrote:
> On Friday 29 April 2016 01:21:37 Yury Norov wrote:
> > index 1458ad7..410d817 100644
> > --- a/arch/arm64/kernel/sys_ilp32.c
> > +++ b/arch/arm64/kernel/sys_ilp32.c
> > @@ -17,6 +17,8 @@
> >  * along with this program.  If not, see
> >  * <http://www.gnu.org/licenses/>.
> >  */
> >     
> > +#define __SYSCALL_COMPAT
> > +
> >  #include <linux/compiler.h>
> >  #include <linux/errno.h>
> >  #include <linux/fs.h>
> > @@ -48,13 +50,12 @@ asmlinkage long
> >  ilp32_sys_rt_sigreturn_wrapper(void);
> >    
> >  #include <asm/syscall.h>
> >      
> > -#undef __SYSCALL
> > -#undef __SC_COMP
> > -#undef __SC_WRAP
> > -#undef __SC_3264
> > -#undef __SC_COMP_3264
> >  
> > -#define __SYSCALL_COMPAT
> >  #define __SYSCALL(nr, sym)     [nr] = sym,
> >  #define __SC_WRAP(nr, sym)     [nr] = compat_##sym,
> >          
> > This patch makes gcc warn about redefinition.
> > 
> > arch/arm64/kernel/sys_ilp32.c:59:0: warning: "__SYSCALL" redefined
> >  #define __SYSCALL(nr, sym) [nr] = sym,
> >  ^
> > In file included from include/asm-generic/unistd.h:1:0,
> > 
> 
> Ok, I think I see it now. Can you #undef the two symbols at the
> end of arch/arm64/include/uapi/asm/unistd.h

I think it doesn't look better than what we have now, but not worse
as well. If you like it, I'll change.

> or possibly
> include/uapi/asm-generic/unistd.h?
> 
> 	Arnd