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Message-Id: <20221208183101.1162006-3-yury.norov@gmail.com>
Date: Thu, 8 Dec 2022 10:30:58 -0800
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Barry Song <baohua@...nel.org>,
Ben Segall <bsegall@...gle.com>,
haniel Bristot de Oliveira <bristot@...hat.com>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Gal Pressman <gal@...dia.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Heiko Carstens <hca@...ux.ibm.com>,
Ingo Molnar <mingo@...hat.com>,
Jakub Kicinski <kuba@...nel.org>,
Jason Gunthorpe <jgg@...dia.com>,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Juri Lelli <juri.lelli@...hat.com>,
Leon Romanovsky <leonro@...dia.com>,
Mel Gorman <mgorman@...e.de>,
Peter Zijlstra <peterz@...radead.org>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Saeed Mahameed <saeedm@...dia.com>,
Steven Rostedt <rostedt@...dmis.org>,
Tariq Toukan <tariqt@...dia.com>,
Tariq Toukan <ttoukan.linux@...il.com>,
Tony Luck <tony.luck@...el.com>,
Valentin Schneider <vschneid@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>
Cc: Yury Norov <yury.norov@...il.com>, linux-crypto@...r.kernel.org,
netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: [PATCH v3 2/5] cpumask: introduce cpumask_nth_and_andnot
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@...il.com>
---
include/linux/cpumask.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 9543b22d6dc2..5c4905108d1b 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 __always_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
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