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Tue, 28 Jul 2026 09:29:10 +0000 (GMT) Received: from [9.224.81.112] (unknown [9.224.81.112]) by smtpav02.wdc07v.mail.ibm.com (Postfix) with ESMTP; Tue, 28 Jul 2026 09:29:10 +0000 (GMT) Message-ID: Date: Tue, 28 Jul 2026 11:28:48 +0200 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/4] s390/cio: Remove cond_resched() calls To: Heiko Carstens , Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Harald Freudenberger , Holger Dengler , Vineeth Vijayan , Janosch Frank , Claudio Imbrenda , David Hildenbrand , Peter Zijlstra Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260727162430.1599396-1-hca@linux.ibm.com> <20260727162430.1599396-5-hca@linux.ibm.com> From: Peter Oberparleiter Content-Language: en-US In-Reply-To: <20260727162430.1599396-5-hca@linux.ibm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: RZRyVYBZiqJRf3NIt0B6c0IN5RNHnf3I X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI4MDA4MCBTYWx0ZWRfX4o8i0MZQY7Ai MuchS39/NtJU8kLZu2taSZ43i+2fv2Q+e+opELZrvi+Dt6EfVxyD6DPoOZ++TK0p2WtKhRJgtah g15OES0yftWYcvc5Mxek+aX6B/GQfjI= X-Authority-Analysis: v=2.4 cv=E/z9Y6dl c=1 sm=1 tr=0 ts=6a68766b cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=yxu4S9OlT7h8PgVkVWIA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI4MDA4MCBTYWx0ZWRfX/JA2IL0EFIrZ Jj5eB0SkUiRHZesDkeLquemo/TN9Fo8RfjO9z0hnBtncpbIVZZs+6oEJzrau15Xap8PpuDwJ1ta 3NsRkliLK55j+h1BFCQ5CQmEahULof9dqZ4d2MnByfMJk7Zx0jF0JpACrbQsQ+OLlUGfCPPgptO QuhJpiIGoq6SFLfId1RijfirDy70TKCXatRRMZCLN5fmVLyx8Pj80ziWxU4Z4rS9UjrzyhXCCgL rY2CarvJ1KcP3kfABUvznu9DXNESOTNjFd9aWtq6Ot/IpPYjC6u5Xm+UUzWrbXrm4u+SDCSsCog 3hGACXnR9+093O18k5VW0KeuiS2grsjOwr0mLFLalXJfRKQJ2bM+Rkm+7Mgs/gg6OoGe9u6C2Iq cWkY2ngHAwh5Nz2E92laee0/ZBjnpSGXjcmx4ZUezibWhjIqkL+FIPo+Y8sEXcmZviupUEsQ6PV 2Tdf6cWfwxsVJBqzUOQ== X-Proofpoint-GUID: RZRyVYBZiqJRf3NIt0B6c0IN5RNHnf3I X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-28_02,2026-07-27_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 spamscore=0 clxscore=1011 phishscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 impostorscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607280080 On 27.07.2026 18:24, Heiko Carstens wrote: > Since [1] cond_resched() is a no-op on s390. Remove all calls. > > [1] commit 7dadeaa6e851 ("sched: Further restrict the preemption modes") > > Signed-off-by: Heiko Carstens Makes sense, also given that this use of cond_resched() was added specifically for the non-preempt case: To quote b207f5a8f9a6 ("s390/cio: Relax subchannel scan loop"): ... This processing can take a significant amount of time during which no other task can run on the same CPU (unless CONFIG_PREEMPT has been enabled). ... Reviewed-by: Peter Oberparleiter -- Peter Oberparleiter Linux on IBM Z Development - IBM Germany R&D