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Mon, 15 Dec 2025 17:20:05 -0800 (PST) Received: from localhost ([2601:346:0:79bd:6b0:1f10:bc87:9bd7]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-64477d58416sm7082747d50.10.2025.12.15.17.20.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Dec 2025 17:20:05 -0800 (PST) From: "Yury Norov (NVIDIA)" To: Atish Patra , Anup Patel , Will Deacon , Mark Rutland , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Ji Sheng Teoh , linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Cc: "Yury Norov (NVIDIA)" Subject: [PATCH] drivers: perf: use bitmap_empty() where appropriate Date: Mon, 15 Dec 2025 20:20:03 -0500 Message-ID: <20251216012004.341288-1-yury.norov@gmail.com> X-Mailer: git-send-email 2.43.0 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" bitmap_empty() is more verbose and efficient, as it stops traversing bitmaps as soon as the 1st set bit found. Switch perf code to using bitmap_empty() where appropriate, and correspondingly use boolean types. Signed-off-by: Yury Norov (NVIDIA) --- drivers/perf/riscv_pmu_sbi.c | 2 +- drivers/perf/starfive_starlink_pmu.c | 3 +-- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c index 7dd282da67ce..9dcc22fd48ef 100644 --- a/drivers/perf/riscv_pmu_sbi.c +++ b/drivers/perf/riscv_pmu_sbi.c @@ -1244,7 +1244,7 @@ static int riscv_pm_pmu_notify(struct notifier_block = *b, unsigned long cmd, { struct riscv_pmu *rvpmu =3D container_of(b, struct riscv_pmu, riscv_pm_nb= ); struct cpu_hw_events *cpuc =3D this_cpu_ptr(rvpmu->hw_events); - int enabled =3D bitmap_weight(cpuc->used_hw_ctrs, RISCV_MAX_COUNTERS); + bool enabled =3D !bitmap_empty(cpuc->used_hw_ctrs, RISCV_MAX_COUNTERS); struct perf_event *event; int idx; =20 diff --git a/drivers/perf/starfive_starlink_pmu.c b/drivers/perf/starfive_s= tarlink_pmu.c index 5e5a672b4229..964897c2baa9 100644 --- a/drivers/perf/starfive_starlink_pmu.c +++ b/drivers/perf/starfive_starlink_pmu.c @@ -450,8 +450,7 @@ static int starlink_pmu_pm_notify(struct notifier_block= *b, starlink_pmu_pm_nb); struct starlink_hw_events *hw_events =3D this_cpu_ptr(starlink_pmu->hw_events); - int enabled =3D bitmap_weight(hw_events->used_mask, - STARLINK_PMU_MAX_COUNTERS); + bool enabled =3D !bitmap_empty(hw_events->used_mask, STARLINK_PMU_MAX_COU= NTERS); struct perf_event *event; int idx; =20 --=20 2.43.0