diff options
| -rw-r--r-- | mm/swapfile.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 8837b22c848d..52a9dd9dab8e 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -296,13 +296,18 @@ static inline void unlock_cluster(struct swap_cluster_info *ci) spin_unlock(&ci->lock); } +/* + * Determine the locking method in use for this device. Return + * swap_cluster_info if SSD-style cluster-based locking is in place. + */ static inline struct swap_cluster_info *lock_cluster_or_swap_info( - struct swap_info_struct *si, - unsigned long offset) + struct swap_info_struct *si, unsigned long offset) { struct swap_cluster_info *ci; + /* Try to use fine-grained SSD-style locking if available: */ ci = lock_cluster(si, offset); + /* Otherwise, fall back to traditional, coarse locking: */ if (!ci) spin_lock(&si->lock); |