linux-kernel - [PATCH v2 1/2] cpumask: Add for_each_cpu

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Message-Id: <20240410213311.511470-2-kyle.meyer@hpe.com>
Date: Wed, 10 Apr 2024 16:33:10 -0500
From: Kyle Meyer <kyle.meyer@....com>
To: linux-kernel@...r.kernel.org, yury.norov@...il.com,
        andriy.shevchenko@...ux.intel.com, linux@...musvillemoes.dk,
        mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com
Cc: russ.anderson@....com, dimitri.sivanich@....com, steve.wahl@....com,
        Kyle Meyer <kyle.meyer@....com>
Subject: [PATCH v2 1/2] cpumask: Add for_each_cpu_from()

Add for_each_cpu_from() as a generic cpumask macro.

for_each_cpu_from() is the same as for_each_cpu(), except it starts at
@cpu instead of zero.

Signed-off-by: Kyle Meyer <kyle.meyer@....com>
Acked-by: Yury Norov <yury.norov@...il.com>
---
 include/linux/cpumask.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 1c29947db848..d75060fbd058 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -368,6 +368,16 @@ unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int sta
 #define for_each_cpu_or(cpu, mask1, mask2)				\
 	for_each_or_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits)
 
+/**
+ * for_each_cpu_from - iterate over CPUs present in @mask, from @cpu to the end of @mask.
+ * @cpu: the (optionally unsigned) integer iterator
+ * @mask: the cpumask pointer
+ *
+ * After the loop, cpu is >= nr_cpu_ids.
+ */
+#define for_each_cpu_from(cpu, mask)				\
+	for_each_set_bit_from(cpu, cpumask_bits(mask), small_cpumask_bits)
+
 /**
  * cpumask_any_but - return a "random" in a cpumask, but not this one.
  * @mask: the cpumask to search
-- 
2.44.0