linux-kernel - [PATCH 01/20] compat ABI: use non-compat openat and open_by_handle

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Date:   Mon, 19 Jun 2017 18:49:44 +0300
From:   Yury Norov <ynorov@...iumnetworks.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Cc:     Yury Norov <ynorov@...iumnetworks.com>,
        Adam Borowski <kilobyte@...band.pl>,
        Andreas Schwab <schwab@...e.de>,
        Andrew Pinski <pinskia@...il.com>,
        Bamvor Zhangjian <bamvor.zhangjian@...wei.com>,
        Chris Metcalf <cmetcalf@...hip.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Florian Weimer <fweimer@...hat.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        James Hogan <james.hogan@...tec.com>,
        James Morse <james.morse@....com>,
        Joseph Myers <joseph@...esourcery.com>,
        Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
        Nathan_Lynch@...tor.com, Prasun.Kapoor@...iumnetworks.com,
        Ramana Radhakrishnan <ramana.gcc@...glemail.com>,
        Steve Ellcey <sellcey@...iumnetworks.com>,
        Alexander Graf <agraf@...e.de>,
        Mark Brown <broonie@...nel.org>,
        christoph.muellner@...obroma-systems.com, davem@...emloft.net,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Alexey Klimov <klimov.linux@...il.com>, linyongting@...wei.com,
        manuel.montezelo@...il.com, philipp.tomsich@...obroma-systems.com,
        schwidefsky@...ibm.com, szabolcs.nagy@....com,
        zhouchengming1@...wei.com
Subject: [PATCH 01/20] compat ABI: use non-compat openat and open_by_handle_at variants

The only difference is that non-compat version forces O_LARGEFILE,
and it should be the default behaviour for all architectures, as
we are going to drop the support of 32-bit userspace off_t.

The exception is tile32 that continues with compat version of syscalls.

Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
Acked-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Chris Metcalf <cmetcalf@...hip.com> [for tile]
---
 arch/tile/kernel/compat.c         | 3 +++
 include/uapi/asm-generic/unistd.h | 5 ++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/tile/kernel/compat.c b/arch/tile/kernel/compat.c
index bdaf71d31a4a..3b7853c59395 100644
--- a/arch/tile/kernel/compat.c
+++ b/arch/tile/kernel/compat.c
@@ -103,6 +103,9 @@ COMPAT_SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned int, offset_high,
 #define compat_sys_readahead sys32_readahead
 #define sys_llseek compat_sys_llseek
 
+#define sys_openat		compat_sys_openat
+#define sys_open_by_handle_at	compat_sys_open_by_handle_at
+
 /* Call the assembly trampolines where necessary. */
 #define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
 #define sys_clone _sys_clone
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 061185a5eb51..429dd335def6 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -178,7 +178,7 @@ __SYSCALL(__NR_fchownat, sys_fchownat)
 #define __NR_fchown 55
 __SYSCALL(__NR_fchown, sys_fchown)
 #define __NR_openat 56
-__SC_COMP(__NR_openat, sys_openat, compat_sys_openat)
+__SYSCALL(__NR_openat, sys_openat)
 #define __NR_close 57
 __SYSCALL(__NR_close, sys_close)
 #define __NR_vhangup 58
@@ -675,8 +675,7 @@ __SYSCALL(__NR_fanotify_mark, sys_fanotify_mark)
 #define __NR_name_to_handle_at         264
 __SYSCALL(__NR_name_to_handle_at, sys_name_to_handle_at)
 #define __NR_open_by_handle_at         265
-__SC_COMP(__NR_open_by_handle_at, sys_open_by_handle_at, \
-	  compat_sys_open_by_handle_at)
+__SYSCALL(__NR_open_by_handle_at, sys_open_by_handle_at)
 #define __NR_clock_adjtime 266
 __SC_COMP(__NR_clock_adjtime, sys_clock_adjtime, compat_sys_clock_adjtime)
 #define __NR_syncfs 267
-- 
2.11.0