From: Baoquan He <bhe@redhat.com>
Date: Mon, 24 Oct 2022 08:14:30 +0000 (+0800)
Subject: mm/percpu: Update the code comment when creating new chunk
X-Git-Tag: io_uring-6.2-2022-12-19~84^2~4
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=e04cb6976340d5ebf2b28ad91bf6a13a285aa566;p=linux-2.6-block.git

mm/percpu: Update the code comment when creating new chunk

The lock pcpu_alloc_mutex taking code has been moved to the beginning of
pcpu_allo() if it's non atomic allocation. So the code comment above
above pcpu_create_chunk() callsite need be updated.

Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
---

diff --git a/mm/percpu.c b/mm/percpu.c
index 841bb93aaae6..68d5ba61c935 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1817,16 +1817,12 @@ restart:
 
 	spin_unlock_irqrestore(&pcpu_lock, flags);
 
-	/*
-	 * No space left.  Create a new chunk.  We don't want multiple
-	 * tasks to create chunks simultaneously.  Serialize and create iff
-	 * there's still no empty chunk after grabbing the mutex.
-	 */
 	if (is_atomic) {
 		err = "atomic alloc failed, no space left";
 		goto fail;
 	}
 
+	/* No space left.  Create a new chunk. */
 	if (list_empty(&pcpu_chunk_lists[pcpu_free_slot])) {
 		chunk = pcpu_create_chunk(pcpu_gfp);
 		if (!chunk) {