linux-kernel - Re: [PATCH v6 04/20] arm64: change some CONFIG_COMPAT over to use CONFIG_AARCH32

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Message-ID: <20151223141558.GA22543@yury-N73SV>
Date:	Wed, 23 Dec 2015 17:15:58 +0300
From:	Yury Norov <ynorov@...iumnetworks.com>
To:	<arnd@...db.de>, <catalin.marinas@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC:	<pinskia@...il.com>, <Prasun.Kapoor@...iumnetworks.com>,
	<schwab@...e.de>, <Nathan_Lynch@...tor.com>, <agraf@...e.de>,
	<klimov.linux@...il.com>, <broonie@...nel.org>,
	<jan.dakinevich@...il.com>, <ddaney.cavm@...il.com>,
	<bamvor.zhangjian@...wei.com>,
	<philipp.tomsich@...obroma-systems.com>, <joseph@...esourcery.com>,
	<christoph.muellner@...obroma-systems.com>,
	Andrew Pinski <apinski@...ium.com>,
	Andrew Pinski <Andrew.Pinski@...iumnetworks.com>
Subject: Re: [PATCH v6 04/20] arm64: change some CONFIG_COMPAT over to use
 CONFIG_AARCH32_EL0 instead

On Wed, Dec 16, 2015 at 12:42:30AM +0300, Yury Norov wrote:
> --- a/arch/arm64/include/asm/unistd.h
> +++ b/arch/arm64/include/asm/unistd.h
> @@ -13,9 +13,8 @@
>   * You should have received a copy of the GNU General Public License
>   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
>   */
> -#ifdef CONFIG_COMPAT
> +#ifdef CONFIG_AARCH32_EL0
>  #define __ARCH_WANT_COMPAT_SYS_GETDENTS64
> -#define __ARCH_WANT_COMPAT_STAT64
>  #define __ARCH_WANT_SYS_GETHOSTNAME
>  #define __ARCH_WANT_SYS_PAUSE
>  #define __ARCH_WANT_SYS_GETPGRP
> @@ -26,7 +25,9 @@
>  #define __ARCH_WANT_COMPAT_SYS_SENDFILE
>  #define __ARCH_WANT_SYS_FORK
>  #define __ARCH_WANT_SYS_VFORK
> +#endif
>  
> +#ifdef CONFIG_COMPAT

It seems like __NR_compat_* and __ARM_NR_compat_*
are needed by aarch32 only. If so, it should not be
defined for ilp32. And the only common definition
here would be __ARCH_WANT_COMPAT_STAT64.

>  /*
>   * Compat syscall numbers used by the AArch64 kernel.
>   */
> @@ -44,6 +45,8 @@
>  #define __ARM_NR_compat_cacheflush	(__ARM_NR_COMPAT_BASE+2)
>  #define __ARM_NR_compat_set_tls		(__ARM_NR_COMPAT_BASE+5)
>  
> +#define __ARCH_WANT_COMPAT_STAT64
> +
>  #define __NR_compat_syscalls		390
>  #endif
--
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