linux-kernel - [PATCH 2/3] cpumask: introduce cpumask

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250608194536.28130-3-yury.norov@gmail.com>
Date: Sun,  8 Jun 2025 15:45:34 -0400
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org,
	Yury Norov <yury.norov@...il.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	John Stultz <jstultz@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Stephen Boyd <sboyd@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 2/3] cpumask: introduce cpumask_random()

From: "Yury Norov [NVIDIA]" <yury.norov@...il.com>

Propagate find_random_bit() to cpumask API.

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@...il.com>
---
 include/linux/cpumask.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 7ae80a7ca81e..39b71b662da3 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -354,6 +354,18 @@ unsigned int cpumask_next_wrap(int n, const struct cpumask *src)
 	return find_next_bit_wrap(cpumask_bits(src), small_cpumask_bits, n + 1);
 }
 
+/**
+ * cpumask_random - get random cpu in *src.
+ * @src: cpumask pointer
+ *
+ * Return: random set bit, or >= nr_cpu_ids if @src is empty.
+ */
+static __always_inline
+unsigned int cpumask_random(const struct cpumask *src)
+{
+	return find_random_bit(cpumask_bits(src), nr_cpu_ids);
+}
+
 /**
  * for_each_cpu - iterate over every cpu in a mask
  * @cpu: the (optionally unsigned) integer iterator
-- 
2.43.0