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Wysocki" , Daniel Lezcano , Christian Loehle , Anna-Maria Behnsen , Frederic Weisbecker , Ingo Molnar , Thomas Gleixner Cc: Mete Durlu , Ilya Leoshkevich , Christian Borntraeger , linux-s390 , linux-kernel Subject: [PATCH 2/5] tick: Remove arch_needs_cpu Date: Tue, 9 Jun 2026 09:52:10 +0200 Message-ID: <20260609075213.31094-3-meted@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260609075213.31094-1-meted@linux.ibm.com> References: <20260609075213.31094-1-meted@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjA5MDA3MSBTYWx0ZWRfX8EvPRUMBmhqI oilUvsTQNUPQw+6svnhFLM+Ai+VbrsVDcOXSsM6kJ2fNfTFcFQna1hm4zY3Jb2yen7VSS+lPbmz /efkDLp9JWagaijHWkFOwf/EozqxTIYdTG3QCCOsFG268/oasCHeNqbShnbvRZWu0jky7Gm2jZE CqFOh8fIrqb4NKWLFh0TOOCnU0Zipf1dqOCUoCNXZQyqic+C51/VGY+Pre57hqG1JPh/rmJfgi5 UxSR1ucKiRJq1ps/YUzt58egd1cwWKlDj4LnLV33MA/JITis5A0F1MHmjGoidc9a1A8zzX6Abbz gzo5qryOv789RO0cxT068Kdrz56qkk91J/oTvc7n1b4PRzJqdZ4SuVDuGrPI42RzqCNiGE7nupO SOXy7cv4frFaXq2TH5koD3saKcTv0IBHh70jLnPMvIAPQnXRUXubBaGVxvOSPaem7zeuMEVVwdb 04NVE7UdiZoS15rJGGw== X-Authority-Analysis: v=2.4 cv=HvFG3UTS c=1 sm=1 tr=0 ts=6a27c643 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=-_MXh9RRoCZl6R2akIQA:9 X-Proofpoint-ORIG-GUID: IjqpRPbAfpAAYsXlXUWEogK2Ie6ODL1O X-Proofpoint-GUID: IjqpRPbAfpAAYsXlXUWEogK2Ie6ODL1O X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-09_01,2026-06-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1011 lowpriorityscore=0 adultscore=0 suspectscore=0 spamscore=0 priorityscore=1501 phishscore=0 malwarescore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606090071 Remove unused arch_needs_cpu() hook. No architectures use it after s390 removed its use case. Suggested-by: Heiko Carstens Signed-off-by: Mete Durlu --- include/linux/tick.h | 3 --- kernel/time/tick-sched.c | 7 +++---- 2 files changed, 3 insertions(+), 7 deletions(-) diff --git a/include/linux/tick.h b/include/linux/tick.h index 738007d6f577..0f6757f81839 100644 --- a/include/linux/tick.h +++ b/include/linux/tick.h @@ -44,9 +44,6 @@ static inline void tick_unfreeze(void) { } #ifdef CONFIG_TICK_ONESHOT extern void tick_irq_enter(void); -# ifndef arch_needs_cpu -# define arch_needs_cpu() (0) -# endif # else static inline void tick_irq_enter(void) { } #endif diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index cbbb87a0c6e7..cee18999d818 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -943,8 +943,7 @@ static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu) ts->timer_expires_base = basemono; /* - * Keep the periodic tick, when RCU, architecture or irq_work - * requests it. + * Keep the periodic tick, when RCU or irq_work requests it. * Aside of that, check whether the local timer softirq is * pending. If so, its a bad idea to call get_next_timer_interrupt(), * because there is an already expired timer, so it will request @@ -952,8 +951,8 @@ static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu) * minimal delta, which brings us back to this place * immediately. Lather, rinse and repeat... */ - if (rcu_needs_cpu() || arch_needs_cpu() || - irq_work_needs_cpu() || local_timer_softirq_pending()) { + if (rcu_needs_cpu() || irq_work_needs_cpu() || + local_timer_softirq_pending()) { next_tick = basemono + TICK_NSEC; } else { /* -- 2.54.0