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| author | NeilBrown <neilb@suse.de> | 2015-05-20 08:05:09 +0300 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2015-05-21 02:14:41 +0300 |
| commit | 8532e3439087de69bb1b71fd6be2baa6fc196a55 (patch) | |
| tree | 83a2251c16c683f096e827af104cfef1fa8ed60b | |
| parent | a81157768a00e8cf8a7b43b5ea5cac931262374f (diff) | |
| download | linux-8532e3439087de69bb1b71fd6be2baa6fc196a55.tar.xz | |
md/bitmap: remove rcu annotation from pointer arithmetic.
Evaluating "&mddev->disks" is simple pointer arithmetic, so
it does not need 'rcu' annotations - no dereferencing is happening.
Also enhance the comment to explain that 'rdev' in that case
is not actually a pointer to an rdev.
Reported-by: Patrick Marlier <patrick.marlier@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
| -rw-r--r-- | drivers/md/bitmap.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index 2bc56e2a3526..135a0907e9de 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -177,11 +177,16 @@ static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mdde * nr_pending is 0 and In_sync is clear, the entries we return will * still be in the same position on the list when we re-enter * list_for_each_entry_continue_rcu. + * + * Note that if entered with 'rdev == NULL' to start at the + * beginning, we temporarily assign 'rdev' to an address which + * isn't really an rdev, but which can be used by + * list_for_each_entry_continue_rcu() to find the first entry. */ rcu_read_lock(); if (rdev == NULL) /* start at the beginning */ - rdev = list_entry_rcu(&mddev->disks, struct md_rdev, same_set); + rdev = list_entry(&mddev->disks, struct md_rdev, same_set); else { /* release the previous rdev and start from there. */ rdev_dec_pending(rdev, mddev); |