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From: Shrikanth Hegde <sshegde@linux.ibm.com>
To: linux-kernel@vger.kernel.org, yury.norov@gmail.com,
	linux-perf-users@vger.kernel.org
Cc: sshegde@linux.ibm.com, mingo@kernel.org, peterz@infradead.org,
	juri.lelli@redhat.com, vincent.guittot@linaro.org,
	tglx@kernel.org, sudeep.holla@kernel.org,
	linux@rasmusvillemoes.dk
Subject: [PATCH 0/5] cpumask: Use cpumask_intersects* APIs where applicable
Date: Wed, 11 Nov 2026 13:29:40 +0530	[thread overview]
Message-ID: <20261111075945.3930230-1-sshegde@linux.ibm.com> (raw)

It was observed while working on cpumask_intersects_and, check like
below could use it instead.

if (cpumask_first_and_and() < nr_cpu_ids)

While there, did check the code for any such similar patterns of
cpumask_any_and, cpumask_first_and and explicit loops where
cpu found by these APIs are not being used. All those callsites
instead can simply use cpumask_intersects.

Note that few more places can use similar change. But, I have left
them as is. 
drivers/net/ethernet/sfc/efx_channels.c+370
drivers/net/ethernet/sfc/siena/efx_channels.c+371
drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c+153

Also, these patches can combined into three patches if that is
easier for review/merge. I have kept it separate since they belong
to different subsystems.

Shrikanth Hegde (5):
  sched/rt: cpupri_find: Use cpumask_intersects where applicable
  cpu/hotplug: Use cpumask_intersects where applicable
  perf: Use cpumask_intersects where applicable
  cpuidle: Use cpumask_intersects_and where applicable
  arch_topology: Use cpumask_intersects where applicable

 drivers/base/arch_topology.c | 9 +--------
 drivers/cpuidle/coupled.c    | 4 ++--
 kernel/cpu.c                 | 3 +--
 kernel/events/core.c         | 7 ++-----
 kernel/sched/cpupri.c        | 2 +-
 5 files changed, 7 insertions(+), 18 deletions(-)

-- 
2.52.0


             reply	other threads:[~2026-11-11  8:00 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-11-11  7:59 Shrikanth Hegde [this message]
2026-11-11  7:59 ` [PATCH 1/5] sched/rt: cpupri_find: Use cpumask_intersects " Shrikanth Hegde
2026-11-11  7:59 ` [PATCH 2/5] cpu/hotplug: " Shrikanth Hegde
2026-11-11  7:59 ` [PATCH 3/5] perf: " Shrikanth Hegde
2026-11-11  7:59 ` [PATCH 4/5] cpuidle: Use cpumask_intersects_and " Shrikanth Hegde
2026-11-11  7:59 ` [PATCH 5/5] arch_topology: Use cpumask_intersects " Shrikanth Hegde

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