From: Yury Norov <yury.norov@gmail.com>
To: linux-kernel@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Barry Song <baohua@kernel.org>, Ben Segall <bsegall@google.com>,
haniel Bristot de Oliveira <bristot@redhat.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Gal Pressman <gal@nvidia.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Heiko Carstens <hca@linux.ibm.com>,
Ingo Molnar <mingo@redhat.com>, Jakub Kicinski <kuba@kernel.org>,
Jason Gunthorpe <jgg@nvidia.com>,
Jesse Brandeburg <jesse.brandeburg@intel.com>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Juri Lelli <juri.lelli@redhat.com>,
Leon Romanovsky <leonro@nvidia.com>, Mel Gorman <mgorman@suse.de>,
Peter Zijlstra <peterz@infradead.org>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Saeed Mahameed <saeedm@nvidia.com>,
Steven Rostedt <rostedt@goodmis.org>,
Tariq Toukan <tariqt@nvidia.com>,
Tariq Toukan <ttoukan.linux@gmail.com>,
Tony Luck <tony.luck@intel.com>,
Valentin Schneider <vschneid@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>
Cc: Yury Norov <yury.norov@gmail.com>,
linux-crypto@vger.kernel.org, netdev@vger.kernel.org,
linux-rdma@vger.kernel.org
Subject: [PATCH v2 2/4] cpumask: introduce cpumask_nth_and_andnot
Date: Sat, 12 Nov 2022 11:09:44 -0800 [thread overview]
Message-ID: <20221112190946.728270-3-yury.norov@gmail.com> (raw)
In-Reply-To: <20221112190946.728270-1-yury.norov@gmail.com>
Introduce cpumask_nth_and_andnot() based on find_nth_and_andnot_bit().
It's used in the following patch to traverse cpumasks without storing
intermediate result in temporary cpumask.
Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
include/linux/cpumask.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index c2aa0aa26b45..debfa2261569 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -391,6 +391,26 @@ unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1,
nr_cpumask_bits, cpumask_check(cpu));
}
+/**
+ * cpumask_nth_and_andnot - get the Nth cpu set in 1st and 2nd cpumask, and clear in 3rd.
+ * @srcp1: the cpumask pointer
+ * @srcp2: the cpumask pointer
+ * @srcp3: the cpumask pointer
+ * @cpu: the N'th cpu to find, starting from 0
+ *
+ * Returns >= nr_cpu_ids if such cpu doesn't exist.
+ */
+static inline
+unsigned int cpumask_nth_and_andnot(unsigned int cpu, const struct cpumask *srcp1,
+ const struct cpumask *srcp2,
+ const struct cpumask *srcp3)
+{
+ return find_nth_and_andnot_bit(cpumask_bits(srcp1),
+ cpumask_bits(srcp2),
+ cpumask_bits(srcp3),
+ nr_cpumask_bits, cpumask_check(cpu));
+}
+
#define CPU_BITS_NONE \
{ \
[0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
--
2.34.1
next prev parent reply other threads:[~2022-11-12 19:10 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-12 19:09 [PATCH v2 0/4] cpumask: improve on cpumask_local_spread() locality Yury Norov
2022-11-12 19:09 ` [PATCH v2 1/4] lib/find: introduce find_nth_and_andnot_bit Yury Norov
2022-11-12 19:09 ` Yury Norov [this message]
2022-11-12 19:09 ` [PATCH v2 3/4] sched: add sched_numa_find_nth_cpu() Yury Norov
2022-11-14 14:32 ` Andy Shevchenko
2022-11-14 15:02 ` Andy Shevchenko
2022-12-08 2:55 ` Yury Norov
2022-11-15 17:25 ` Valentin Schneider
2022-11-12 19:09 ` [PATCH v2 4/4] cpumask: improve on cpumask_local_spread() locality Yury Norov
2022-11-15 17:24 ` [PATCH v2 0/4] " Valentin Schneider
2022-11-15 18:32 ` Yury Norov
2022-11-17 12:23 ` Valentin Schneider
2022-11-28 6:39 ` Tariq Toukan
2022-11-30 1:47 ` Yury Norov
2022-12-07 12:53 ` Tariq Toukan
2022-12-07 20:45 ` Yury Norov
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