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Fri, 27 Mar 2026 06:31:34 +0000 (GMT) From: Shrikanth Hegde To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, yury.norov@gmail.com, linux@rasmusvillemoes.dk, linux-kernel@vger.kernel.org Cc: sshegde@linux.ibm.com, chleroy@kernel.org Subject: [PATCH 1/2] powerpc: Use cpumask_next_wrap instead Date: Fri, 27 Mar 2026 12:01:28 +0530 Message-ID: <20260327063129.127302-2-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260327063129.127302-1-sshegde@linux.ibm.com> References: <20260327063129.127302-1-sshegde@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI3MDA0NSBTYWx0ZWRfX57huGs15JTeP ZFGIYpmg+s/AvKciXdjzj4rhCFhpbTofkyK+kNQ5STy5tw+g0I2XcmCCBrMMxof7gwN8ISZRvu9 nmna92Zh8cmbVgTCgcEBwbZoLrQ2wLibDeTe20z35gSjDWsoPuafKisQM1el/HDTwpaOoQoHS/S z7oronkceJILZlQWdKYaf+jup1+LzFzonznE/HvlKkvDu1S+hJ3caqIx1bO89QXOHfivpLveNRW oJwH3DIhLov+nepx+G7KvtFt4Zvp6LjpAPaBtoUd1AwDT2HW8pliXxuS57Xm+D7Dt+Kkb2uOmfD CcXey9Tc/HzwQaap8+5aKyMkSyNINUuT8qCiekbKAkoJQqqqBH3pUWgXOv76cacR1kQDqFn0yau F+AvHhuhvJX6fyCCQORXMA8VUY96xxPcOwWH8HiPZuNs83u9FlAJdniJOZD5XEGZj7M+f03GOqI 0gUZzayOlcw0dqCZ6pw== X-Authority-Analysis: v=2.4 cv=JK42csKb c=1 sm=1 tr=0 ts=69c6244d cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=YLC4c4OjlnaWLdeJtCIA:9 X-Proofpoint-ORIG-GUID: xWL-AQGo3JNpyvPANPYgRB6HsqVJhcjx X-Proofpoint-GUID: 3hADKyb82NFO8Nnbgqs5BvejbwVgLjIw X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-26_04,2026-03-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 adultscore=0 spamscore=0 suspectscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603270045 Content-Type: text/plain; charset="utf-8" cpu =3D cpumask_next(cpu, mask) if (cpu >=3D nr_cpu_ids) cpu =3D cpumask_first(mask) Above block is identical to: cpu =3D cpumask_next_wrap(cpu, mask) Replace it, No change in functionality or performance. Slightly simpler code. Signed-off-by: Shrikanth Hegde Reviewed-by: Yury Norov --- arch/powerpc/kernel/irq.c | 5 +---- arch/powerpc/mm/book3s64/hash_utils.c | 4 +--- arch/powerpc/sysdev/xive/common.c | 5 +---- 3 files changed, 3 insertions(+), 11 deletions(-) diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index a0e8b998c9b5..f69de08ad347 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -370,10 +370,7 @@ int irq_choose_cpu(const struct cpumask *mask) do_round_robin: raw_spin_lock_irqsave(&irq_rover_lock, flags); =20 - irq_rover =3D cpumask_next(irq_rover, cpu_online_mask); - if (irq_rover >=3D nr_cpu_ids) - irq_rover =3D cpumask_first(cpu_online_mask); - + irq_rover =3D cpumask_next_wrap(irq_rover, cpu_online_mask); cpuid =3D irq_rover; =20 raw_spin_unlock_irqrestore(&irq_rover_lock, flags); diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s= 64/hash_utils.c index 9dc5889d6ecb..e4fcf929cb33 100644 --- a/arch/powerpc/mm/book3s64/hash_utils.c +++ b/arch/powerpc/mm/book3s64/hash_utils.c @@ -1299,9 +1299,7 @@ static void stress_hpt_timer_fn(struct timer_list *ti= mer) if (!firmware_has_feature(FW_FEATURE_LPAR)) tlbiel_all(); 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charset="utf-8" A few miscellanous changes in handling cpumask api's in the order they appear: - cpumask_next(cpu, mask) >=3D nr_cpu_ids is used to determine if cpu is the last CPU.=20 - cpumask_next can take -1 as valid argument. So simplify cpuinfo iterator. /proc/cpuinfo shows same info with patch. - cpumask_weight can't be more than nr_cpu_ids. So remove the pointless comparison. Signed-off-by: Shrikanth Hegde Reviewed-by: Yury Norov --- arch/powerpc/kernel/setup-common.c | 7 ++----- arch/powerpc/sysdev/xive/common.c | 7 +++---- 2 files changed, 5 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup= -common.c index b1761909c23f..47215eab296b 100644 --- a/arch/powerpc/kernel/setup-common.c +++ b/arch/powerpc/kernel/setup-common.c @@ -323,7 +323,7 @@ static int show_cpuinfo(struct seq_file *m, void *v) seq_putc(m, '\n'); =20 /* If this is the last cpu, print the summary */ - if (cpumask_next(cpu_id, cpu_online_mask) >=3D nr_cpu_ids) + if (cpu_id =3D=3D cpumask_last(cpu_online_mask)) show_cpuinfo_summary(m); =20 return 0; @@ -331,10 +331,7 @@ static int show_cpuinfo(struct seq_file *m, void *v) =20 static void *c_start(struct seq_file *m, loff_t *pos) { - if (*pos =3D=3D 0) /* just in case, cpu 0 is not the first */ - *pos =3D cpumask_first(cpu_online_mask); - else - *pos =3D cpumask_next(*pos - 1, cpu_online_mask); + *pos =3D cpumask_next(*pos - 1, cpu_online_mask); if ((*pos) < nr_cpu_ids) return (void *)(unsigned long)(*pos + 1); return NULL; diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/c= ommon.c index b6446abe29a6..91dd3b364d7d 100644 --- a/arch/powerpc/sysdev/xive/common.c +++ b/arch/powerpc/sysdev/xive/common.c @@ -548,11 +548,10 @@ static void xive_dec_target_count(int cpu) static int xive_find_target_in_mask(const struct cpumask *mask, unsigned int fuzz) { - int cpu, first, num, i; + int cpu, first, i; =20 - /* Pick up a starting point CPU in the mask based on fuzz */ - num =3D min_t(int, cpumask_weight(mask), nr_cpu_ids); - first =3D fuzz % num; + /* Pick up a starting point CPU in the mask based on fuzz */ + first =3D fuzz % cpumask_weight(mask); =20 /* Locate it */ cpu =3D cpumask_first(mask); --=20 2.47.3