fs_pin: publish pins with RCU list helpers

pin_insert() initializes a pin before adding it under pin_lock.  The kill
paths read the list heads under RCU without taking that lock.  Plain hlist
insertion does not publish the earlier initialization to those readers.

KCSAN weak-memory checking reported acct_on() callback initialization
racing with pin_kill() after the superblock-list publication.  The
corresponding LKMM model permits the stale read with plain publication;
the RCU release/acquire pair forbids it.

Use the RCU hlist add and dereference helpers for both pin lists.

Fixes: 2798d4ce6160 ("acct: get rid of acct_lock for acct->count")
Cc: stable@vger.kernel.org
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Link: https://patch.msgid.link/20260903002100.34822-1-kmehltretter@gmail.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions