linux-kernel - [PATCH 4/4] lib/cpumask: don't mention for_each_numa_hop_mask in cpumask_local

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Message-Id: <20230925020528.777578-5-yury.norov@gmail.com>
Date:   Sun, 24 Sep 2023 19:05:28 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org
Cc:     Yury Norov <yury.norov@...il.com>,
        Tariq Toukan <ttoukan.linux@...il.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Maher Sanalla <msanalla@...dia.com>,
        Ingo Molnar <mingo@...nel.org>, Mel Gorman <mgorman@...e.de>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Pawel Chmielewski <pawel.chmielewski@...el.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Yury Norov <ynorov@...dia.com>
Subject: [PATCH 4/4] lib/cpumask: don't mention for_each_numa_hop_mask in cpumask_local_spread()"

Now that for_each_numa_hop_mask() is reverted, also revert reference to
it in the comment to cpumask_local_spread().

This partially reverts commit 2ac4980c57f5 ("lib/cpumask: update comment
for cpumask_local_spread()")

Signed-off-by: Yury Norov <yury.norov@...il.com>
Signed-off-by: Yury Norov <ynorov@...dia.com>
---
 lib/cpumask.c | 21 ---------------------
 1 file changed, 21 deletions(-)

diff --git a/lib/cpumask.c b/lib/cpumask.c
index a7fd02b5ae26..d341fb71a8a9 100644
--- a/lib/cpumask.c
+++ b/lib/cpumask.c
@@ -117,27 +117,6 @@ void __init free_bootmem_cpumask_var(cpumask_var_t mask)
  *
  * Returns online CPU according to a numa aware policy; local cpus are returned
  * first, followed by non-local ones, then it wraps around.
- *
- * For those who wants to enumerate all CPUs based on their NUMA distances,
- * i.e. call this function in a loop, like:
- *
- * for (i = 0; i < num_online_cpus(); i++) {
- *	cpu = cpumask_local_spread(i, node);
- *	do_something(cpu);
- * }
- *
- * There's a better alternative based on for_each()-like iterators:
- *
- *	for_each_numa_hop_mask(mask, node) {
- *		for_each_cpu_andnot(cpu, mask, prev)
- *			do_something(cpu);
- *		prev = mask;
- *	}
- *
- * It's simpler and more verbose than above. Complexity of iterator-based
- * enumeration is O(sched_domains_numa_levels * nr_cpu_ids), while
- * cpumask_local_spread() when called for each cpu is
- * O(sched_domains_numa_levels * nr_cpu_ids * log(nr_cpu_ids)).
  */
 unsigned int cpumask_local_spread(unsigned int i, int node)
 {
-- 
2.39.2