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[73.224.175.84]) by smtp.gmail.com with ESMTPSA id 00721157ae682-70f8abed254sm31170997b3.39.2025.06.04.12.39.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Jun 2025 12:39:57 -0700 (PDT) From: Yury Norov To: Dennis Dalessandro , Jason Gunthorpe , Leon Romanovsky , Yury Norov , Rasmus Villemoes , linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/7] RDMA: hfi1: simplify init_real_cpu_mask() Date: Wed, 4 Jun 2025 15:39:40 -0400 Message-ID: <20250604193947.11834-5-yury.norov@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250604193947.11834-1-yury.norov@gmail.com> References: <20250604193947.11834-1-yury.norov@gmail.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 Content-Type: text/plain; charset="utf-8" From: "Yury Norov [NVIDIA]" The function opencodes cpumask_nth() and cpumask_clear_cpus(). The dedicated helpers are easier to use and usually much faster than opencoded for-loops. While there, drop useless clear of real_cpu_mask. Signed-off-by: Yury Norov [NVIDIA] --- drivers/infiniband/hw/hfi1/affinity.c | 19 +++++-------------- 1 file changed, 5 insertions(+), 14 deletions(-) diff --git a/drivers/infiniband/hw/hfi1/affinity.c b/drivers/infiniband/hw/= hfi1/affinity.c index 9ea80b777061..b2884226827a 100644 --- a/drivers/infiniband/hw/hfi1/affinity.c +++ b/drivers/infiniband/hw/hfi1/affinity.c @@ -92,9 +92,7 @@ static void cpu_mask_set_put(struct cpu_mask_set *set, in= t cpu) /* Initialize non-HT cpu cores mask */ void init_real_cpu_mask(void) { - int possible, curr_cpu, i, ht; - - cpumask_clear(&node_affinity.real_cpu_mask); + int possible, curr_cpu, ht; =20 /* Start with cpu online mask as the real cpu mask */ cpumask_copy(&node_affinity.real_cpu_mask, cpu_online_mask); @@ -110,17 +108,10 @@ void init_real_cpu_mask(void) * "real" cores. Assumes that HT cores are not enumerated in * succession (except in the single core case). */ - curr_cpu =3D cpumask_first(&node_affinity.real_cpu_mask); - for (i =3D 0; i < possible / ht; i++) - curr_cpu =3D cpumask_next(curr_cpu, &node_affinity.real_cpu_mask); - /* - * Step 2. Remove the remaining HT siblings. Use cpumask_next() to - * skip any gaps. - */ - for (; i < possible; i++) { - cpumask_clear_cpu(curr_cpu, &node_affinity.real_cpu_mask); - curr_cpu =3D cpumask_next(curr_cpu, &node_affinity.real_cpu_mask); - } + curr_cpu =3D cpumask_nth(possible / ht, &node_affinity.real_cpu_mask) + 1; + + /* Step 2. Remove the remaining HT siblings. */ + cpumask_clear_cpus(&node_affinity.real_cpu_mask, curr_cpu, nr_cpu_ids - c= urr_cpu); } =20 int node_affinity_init(void) --=20 2.43.0