linux-kernel - [PATCH 1/5] s390: open-code s390

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Date:   Wed, 16 Jan 2019 14:15:19 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     linux-s390@...r.kernel.org,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Arnd Bergmann <arnd@...db.de>
Cc:     linux-kernel@...r.kernel.org, y2038@...ts.linaro.org,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH 1/5] s390: open-code s390_personality syscall

The sys_personality function is not meant to be called from other system
calls. We could introduce an intermediate ksys_personality function,
but it does almost nothing, so this just moves the implementation into
the caller.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/s390/kernel/sys_s390.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kernel/sys_s390.c b/arch/s390/kernel/sys_s390.c
index 31cefe0c28c0..560bdaf8a74f 100644
--- a/arch/s390/kernel/sys_s390.c
+++ b/arch/s390/kernel/sys_s390.c
@@ -79,12 +79,15 @@ SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
 
 SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
 {
-	unsigned int ret;
+	unsigned int ret = current->personality;
 
 	if (personality(current->personality) == PER_LINUX32 &&
 	    personality(personality) == PER_LINUX)
 		personality |= PER_LINUX32;
-	ret = sys_personality(personality);
+
+	if (personality != 0xffffffff)
+		set_personality(personality);
+
 	if (personality(ret) == PER_LINUX32)
 		ret &= ~PER_LINUX32;
 
-- 
2.20.0