[tip: core/rcu] nfs: Fix nfs_access_get_cached_rcu() sparse error

[tip-bot2 for Madhuparna Bhowmik]

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     9f01eb5d4936f12d57da84cdfbc2a3623e23a7eb
Gitweb:        https://git.kernel.org/tip/9f01eb5d4936f12d57da84cdfbc2a3623e23a7eb
Author:        Madhuparna Bhowmik <madhuparnabhowmik04@xxxxxxxxx>
AuthorDate:    Tue, 10 Dec 2019 11:16:39 +05:30
Committer:     Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Thu, 20 Feb 2020 15:58:21 -08:00

nfs: Fix nfs_access_get_cached_rcu() sparse error

This patch fixes the following sparse error:
fs/nfs/dir.c:2353:14: error: incompatible types in comparison expression (different address spaces):
fs/nfs/dir.c:2353:14:    struct list_head [noderef] <asn:4> *
fs/nfs/dir.c:2353:14:    struct list_head *

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@xxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
 fs/nfs/dir.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 1320288..55a29b0 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2383,7 +2383,7 @@ static int nfs_access_get_cached_rcu(struct inode *inode, const struct cred *cre
 	rcu_read_lock();
 	if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS)
 		goto out;
-	lh = rcu_dereference(nfsi->access_cache_entry_lru.prev);
+	lh = rcu_dereference(list_tail_rcu(&nfsi->access_cache_entry_lru));
 	cache = list_entry(lh, struct nfs_access_entry, lru);
 	if (lh == &nfsi->access_cache_entry_lru ||
 	    cred_fscmp(cred, cache->cred) != 0)