From: Yu Kuai <yukuai3@xxxxxxxxxx>
commit 2314c2e3a70521f055dd011245dccf6fd97c7ee0 upstream.
As commit ad8606702f26 ("md/raid5: remove rcu protection to access rdev
from conf") explains, rcu protection can be removed, however, there are
three places left, there won't be any real problems.
drivers/md/raid5.c:8071:24: error: incompatible types in comparison expression (different address spaces):
drivers/md/raid5.c:8071:24: struct md_rdev [noderef] __rcu *
drivers/md/raid5.c:8071:24: struct md_rdev *
drivers/md/raid5.c:7569:25: error: incompatible types in comparison expression (different address spaces):
drivers/md/raid5.c:7569:25: struct md_rdev [noderef] __rcu *
drivers/md/raid5.c:7569:25: struct md_rdev *
drivers/md/raid5.c:7573:25: error: incompatible types in comparison expression (different address spaces):
drivers/md/raid5.c:7573:25: struct md_rdev [noderef] __rcu *
drivers/md/raid5.c:7573:25: struct md_rdev *
Fixes: ad8606702f26 ("md/raid5: remove rcu protection to access rdev from conf")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
Signed-off-by: Song Liu <song@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240615085143.1648223-1-yukuai1@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/raid5.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -155,7 +155,7 @@ static int raid6_idx_to_slot(int idx, st
return slot;
}
-static void print_raid5_conf (struct r5conf *conf);
+static void print_raid5_conf(struct r5conf *conf);
static int stripe_operations_active(struct stripe_head *sh)
{
@@ -7580,11 +7580,11 @@ static struct r5conf *setup_conf(struct
if (test_bit(Replacement, &rdev->flags)) {
if (disk->replacement)
goto abort;
- RCU_INIT_POINTER(disk->replacement, rdev);
+ disk->replacement = rdev;
} else {
if (disk->rdev)
goto abort;
- RCU_INIT_POINTER(disk->rdev, rdev);
+ disk->rdev = rdev;
}
if (test_bit(In_sync, &rdev->flags)) {
@@ -8066,7 +8066,7 @@ static void raid5_status(struct seq_file
seq_printf (seq, "]");
}
-static void print_raid5_conf (struct r5conf *conf)
+static void print_raid5_conf(struct r5conf *conf)
{
struct md_rdev *rdev;
int i;
@@ -8080,15 +8080,13 @@ static void print_raid5_conf (struct r5c
conf->raid_disks,
conf->raid_disks - conf->mddev->degraded);
- rcu_read_lock();
for (i = 0; i < conf->raid_disks; i++) {
- rdev = rcu_dereference(conf->disks[i].rdev);
+ rdev = conf->disks[i].rdev;
if (rdev)
pr_debug(" disk %d, o:%d, dev:%pg\n",
i, !test_bit(Faulty, &rdev->flags),
rdev->bdev);
}
- rcu_read_unlock();
}
static int raid5_spare_active(struct mddev *mddev)
Patches currently in stable-queue which might be from yukuai3@xxxxxxxxxx are
queue-6.10/dm-raid-fix-warn_on_once-check-for-sync_thread-in-ra.patch
queue-6.10/md-don-t-wait-for-md_recovery_needed-for-hot_remove_.patch
queue-6.10/md-cluster-fix-hanging-issue-while-a-new-disk-adding.patch
queue-6.10/md-raid5-fix-spares-errors-about-rcu-usage.patch
queue-6.10/md-raid0-don-t-free-conf-on-raid0_run-failure.patch
