[PATCH v1 1/9] cgroup: rename cgroup_rstat_flush_"irqsafe" to "atomic"

From: Yosry Ahmed <yosryahmed@google.com>
To: "Tejun Heo" <tj@kernel.org>, "Josef Bacik" <josef@toxicpanda.com>,
	"Jens Axboe" <axboe@kernel.dk>,
	"Zefan Li" <lizefan.x@bytedance.com>,
	"Johannes Weiner" <hannes@cmpxchg.org>,
	"Michal Hocko" <mhocko@kernel.org>,
	"Roman Gushchin" <roman.gushchin@linux.dev>,
	"Shakeel Butt" <shakeelb@google.com>,
	"Muchun Song" <muchun.song@linux.dev>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Michal Koutný" <mkoutny@suse.com>
Cc: Vasily Averin <vasily.averin@linux.dev>,
	cgroups@vger.kernel.org, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	bpf@vger.kernel.org, Yosry Ahmed <yosryahmed@google.com>
Subject: [PATCH v1 1/9] cgroup: rename cgroup_rstat_flush_"irqsafe" to "atomic"
Date: Tue, 28 Mar 2023 06:16:30 +0000	[thread overview]
Message-ID: <20230328061638.203420-2-yosryahmed@google.com> (raw)
In-Reply-To: <20230328061638.203420-1-yosryahmed@google.com>

cgroup_rstat_flush_irqsafe() can be a confusing name. It may read as
"irqs are disabled throughout", which is what the current implementation
does (currently under discussion [1]), but is not the intention. The
intention is that this function is safe to call from atomic contexts.
Name it as such.

Suggested-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
---
 include/linux/cgroup.h | 2 +-
 kernel/cgroup/rstat.c  | 4 ++--
 mm/memcontrol.c        | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 3410aecffdb4..885f5395fcd0 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -692,7 +692,7 @@ static inline void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen)
  */
 void cgroup_rstat_updated(struct cgroup *cgrp, int cpu);
 void cgroup_rstat_flush(struct cgroup *cgrp);
-void cgroup_rstat_flush_irqsafe(struct cgroup *cgrp);
+void cgroup_rstat_flush_atomic(struct cgroup *cgrp);
 void cgroup_rstat_flush_hold(struct cgroup *cgrp);
 void cgroup_rstat_flush_release(void);
 
diff --git a/kernel/cgroup/rstat.c b/kernel/cgroup/rstat.c
index 831f1f472bb8..d3252b0416b6 100644
--- a/kernel/cgroup/rstat.c
+++ b/kernel/cgroup/rstat.c
@@ -241,12 +241,12 @@ __bpf_kfunc void cgroup_rstat_flush(struct cgroup *cgrp)
 }
 
 /**
- * cgroup_rstat_flush_irqsafe - irqsafe version of cgroup_rstat_flush()
+ * cgroup_rstat_flush_atomic- atomic version of cgroup_rstat_flush()
  * @cgrp: target cgroup
  *
  * This function can be called from any context.
  */
-void cgroup_rstat_flush_irqsafe(struct cgroup *cgrp)
+void cgroup_rstat_flush_atomic(struct cgroup *cgrp)
 {
 	unsigned long flags;
 
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 5abffe6f8389..0205e58ea430 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -642,7 +642,7 @@ static void __mem_cgroup_flush_stats(void)
 		return;
 
 	flush_next_time = jiffies_64 + 2*FLUSH_TIME;
-	cgroup_rstat_flush_irqsafe(root_mem_cgroup->css.cgroup);
+	cgroup_rstat_flush_atomic(root_mem_cgroup->css.cgroup);
 	atomic_set(&stats_flush_threshold, 0);
 	spin_unlock_irqrestore(&stats_flush_lock, flag);
 }
-- 
2.40.0.348.gf938b09366-goog

