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Mon, 12 Oct 2026 15:11:55 +0000 (GMT) Received: from li-008a6a4c-3549-11b2-a85c-c5cc2836eea2.ibm.com (unknown [9.224.92.206]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTPS; Mon, 12 Oct 2026 15:11:55 +0000 (GMT) Date: Mon, 12 Oct 2026 17:11:54 +0200 From: Alexander Gordeev To: Heiko Carstens Cc: Sven Schnelle , Vasily Gorbik , Christian Borntraeger , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: Re: [PATCH 4/4] s390/percpu: Implement this_cpu_try_cmpxchg() Message-ID: References: <20261012114249.2898572-1-hca@linux.ibm.com> <20261012114249.2898572-5-hca@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261012114249.2898572-5-hca@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDEyMDA1OCBTYWx0ZWRfX0/2iPTJuMqwf WqC+clYhJI4A0VArb+yS13EEoa+iXWjvg4wd+epCTkSDwto8LBDKxmh0hSOG4h2y6PLj+bnPLUs a3VZzwJFHWVpdOZmSE+AcWB/9SoQ0iYZntQimRMN0ngBHPCUK+48Eh0HTwemHcHBWyJQXKriy8Q 8ZhUrKBS8ml2DXaSEzGizMP0AYRhnXKAAUSNvum+sdDRA3MG28P6gnHPb3QRtuoAj5czfZWAxbB lEUG62PJ3HmUMw7VTaSRpE24xT25hSWfkEDuZXAMuwWuGJerfXYr9RSWT5ygzUDkBNaWzvy6/In JXq48aUfX6doKokzLMxZ/99RIEuZkOos0MKyTUl1C8qrrSViza6BTNxJ7BrLQIPeWGBs0PjjaLU ygk+lKPhLHL38N3JoIK8/M0ZVefq9WguaDVqFwEQ8WoNC3nf2+zgAnD/xBJb4s3Kn8xEZ5RSake XQH144OdngN4rqlqOkg== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDEyMDA1OCBTYWx0ZWRfX3i9oh8TBybl4 17a8wP13vifkZ1Ob2D736PouWNYXcLOAa03MIphyl7ONquOtsu/ShmjOnLjhj0ZwaOgSozhDH1y vnPTPwsm+cZc3PQ2N9XSZ4NKAFoErjQ= X-Proofpoint-ORIG-GUID: Vlvih-jVa1JJKEBuYmw6STT6Ji13hr7E X-Authority-Analysis: v=2.4 cv=a6KlZkSF c=1 sm=1 tr=0 ts=6accf8c0 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=kj9zAlcOel0A:10 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=edS78CHe_KV0HRbkxBwA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-GUID: Vlvih-jVa1JJKEBuYmw6STT6Ji13hr7E X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-12_04,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 malwarescore=0 spamscore=0 suspectscore=0 clxscore=1015 phishscore=0 priorityscore=1501 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610120058 On Mon, Oct 12, 2026 at 01:42:49PM +0200, Heiko Carstens wrote: > Provide an s390 specific implementation of this_cpu_try_cmpxchg() for > the four and eight byte cases, if the compiler supports flag output > operands. > > This variant uses the condition code set by cs/csg, which avoids a > compare instruction required by the generic variant and generates > slightly better code. > > Signed-off-by: Heiko Carstens > --- > arch/s390/include/asm/percpu.h | 39 ++++++++++++++++++++++++++++++++++ > 1 file changed, 39 insertions(+) Acked-by: Alexander Gordeev