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Wed, 2 Nov 2022 14:18:08 +0000 (GMT) Date: Wed, 2 Nov 2022 15:18:07 +0100 From: Heiko Carstens To: Heiko Carstens Cc: Janis Schoetterl-Glausch , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Vasily Gorbik , Alexander Gordeev , David Hildenbrand , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, Paolo Bonzini , Shuah Khan , Sven Schnelle Subject: [PATCH 3/5] s390/cmpxchg: remove digits from input constraints Message-ID: References: <20221012205609.2811294-1-scgl@linux.ibm.com> <20221012205609.2811294-2-scgl@linux.ibm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-TM-AS-GCONF: 00 X-Proofpoint-GUID: C6KEQjwpTbWDYA88PfOFXYc0ASy5lyp7 X-Proofpoint-ORIG-GUID: lgA7BhzU9a0lOETZGHZAGNs64cYwhdPK X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-02_10,2022-11-02_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 malwarescore=0 mlxlogscore=895 clxscore=1015 impostorscore=0 spamscore=0 adultscore=0 phishscore=0 mlxscore=0 lowpriorityscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211020090 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Instead of using a digit for input constraints simply initialize the corresponding output operand in C code and use a "+" constraint modifier. Signed-off-by: Heiko Carstens --- arch/s390/include/asm/cmpxchg.h | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/arch/s390/include/asm/cmpxchg.h b/arch/s390/include/asm/cmpxchg.h index 2ad057b94481..1c5785b851ec 100644 --- a/arch/s390/include/asm/cmpxchg.h +++ b/arch/s390/include/asm/cmpxchg.h @@ -142,26 +142,24 @@ static __always_inline unsigned long __cmpxchg(unsigned long address, return prev >> shift; } case 4: { - unsigned int prev; + unsigned int prev = old; asm volatile( " cs %[prev],%[new],%[address]\n" - : [prev] "=&d" (prev), + : [prev] "+&d" (prev), [address] "+Q" (*(int *)address) - : "0" (old), - [new] "d" (new) + : [new] "d" (new) : "memory", "cc"); return prev; } case 8: { - unsigned long prev; + unsigned long prev = old; asm volatile( " csg %[prev],%[new],%[address]\n" - : [prev] "=&d" (prev), + : [prev] "+&d" (prev), [address] "+QS" (*(long *)address) - : "0" (old), - [new] "d" (new) + : [new] "d" (new) : "memory", "cc"); return prev; }