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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>,
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        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Haniel Bristot de Oliveira <bristot@redhat.com>,
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        Ingo Molnar <mingo@redhat.com>,
        Jacob Keller <jacob.e.keller@intel.com>,
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        Leon Romanovsky <leonro@nvidia.com>,
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        Saeed Mahameed <saeedm@nvidia.com>,
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        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 2/9] cpumask: introduce cpumask_nth_and_andnot
Date:   Fri, 20 Jan 2023 20:24:29 -0800
Message-Id: <20230121042436.2661843-3-yury.norov@gmail.com>
In-Reply-To: <20230121042436.2661843-1-yury.norov@gmail.com>
References: <20230121042436.2661843-1-yury.norov@gmail.com>
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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>
Acked-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Peter Lafreniere <peter@n8pjl.ca>
---
 include/linux/cpumask.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index c2aa0aa26b45..7b16aede7ac5 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