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authorChao Yu <yuchao0@huawei.com>2021-02-20 17:38:43 +0800
committerJaegeuk Kim <jaegeuk@kernel.org>2021-03-12 13:16:42 -0800
commit3b42c741b1bf52ee9ed6fba5f9636d80ddacf73f (patch)
treea2462b90f5489da7f42f0d113a0dbbadf95fb288 /fs/f2fs/checkpoint.c
parent4831675c6be59dbe8e0b2a53dc237111f9307a4b (diff)
f2fs: update comments for explicit memory barrier
Add more detailed comments for explicit memory barrier used by f2fs, in order to enhance code readability. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/checkpoint.c')
-rw-r--r--fs/f2fs/checkpoint.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index d0e5ef7e232e..f6169611270f 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1818,7 +1818,11 @@ int f2fs_issue_checkpoint(struct f2fs_sb_info *sbi)
llist_add(&req.llnode, &cprc->issue_list);
atomic_inc(&cprc->queued_ckpt);
- /* update issue_list before we wake up issue_checkpoint thread */
+ /*
+ * update issue_list before we wake up issue_checkpoint thread,
+ * this smp_mb() pairs with another barrier in ___wait_event(),
+ * see more details in comments of waitqueue_active().
+ */
smp_mb();
if (waitqueue_active(&cprc->ckpt_wait_queue))