percpu: add __percpu sparse annotations to fs

Add __percpu sparse annotations to fs.

These annotations are to make sparse consider percpu variables to be
in a different address space and warn if accessed without going
through percpu accessors.  This patch doesn't affect normal builds.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Alex Elder <aelder@sgi.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>

5 files changed, 6 insertions, 6 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 874d169a193e..4cedc91ec59d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1014,7 +1014,7 @@ struct ext4_sb_info {
         atomic_t s_lock_busy;
 
         /* locality groups */
-        struct ext4_locality_group *s_locality_groups;
+        struct ext4_locality_group __percpu *s_locality_groups;
 
         /* for write statistics */
         unsigned long s_sectors_written_start;
diff --git a/fs/nfs/iostat.h b/fs/nfs/iostat.h
index 46d779abafd3..1d8d5c813b01 100644
--- a/fs/nfs/iostat.h
+++ b/fs/nfs/iostat.h
@@ -57,12 +57,12 @@ static inline void nfs_add_fscache_stats(struct inode *inode,
 }
 #endif
 
-static inline struct nfs_iostats *nfs_alloc_iostats(void)
+static inline struct nfs_iostats __percpu *nfs_alloc_iostats(void)
 {
         return alloc_percpu(struct nfs_iostats);
 }
 
-static inline void nfs_free_iostats(struct nfs_iostats *stats)
+static inline void nfs_free_iostats(struct nfs_iostats __percpu *stats)
 {
         if (stats != NULL)
                 free_percpu(stats);
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 1df7e4502967..24c88870cdb2 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -243,7 +243,7 @@ typedef struct xfs_mount {
         struct xfs_qmops        *m_qm_ops;      /* vector of XQM ops */
         atomic_t                m_active_trans; /* number trans frozen */
 #ifdef HAVE_PERCPU_SB
-        xfs_icsb_cnts_t         *m_sb_cnts;     /* per-cpu superblock counters */
+        xfs_icsb_cnts_t __percpu *m_sb_cnts;    /* per-cpu superblock counters */
         unsigned long           m_icsb_counters; /* disabled per-cpu counters */
         struct notifier_block   m_icsb_notifier; /* hotplug cpu notifier */
         struct mutex            m_icsb_mutex;   /* balancer sync lock */
diff --git a/include/linux/mount.h b/include/linux/mount.h
index 5d5275364867..b5f43a34ef88 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -66,7 +66,7 @@ struct vfsmount {
         int mnt_pinned;
         int mnt_ghosts;
 #ifdef CONFIG_SMP
-        int *mnt_writers;
+        int __percpu *mnt_writers;
 #else
         int mnt_writers;
 #endif
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 34fc6be5bfcf..6a2e44fd75e2 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -105,7 +105,7 @@ struct nfs_server {
         struct rpc_clnt *       client;         /* RPC client handle */
         struct rpc_clnt *       client_acl;     /* ACL RPC client handle */
         struct nlm_host         *nlm_host;      /* NLM client handle */
-        struct nfs_iostats *    io_stats;       /* I/O statistics */
+        struct nfs_iostats __percpu *io_stats;  /* I/O statistics */
         struct backing_dev_info backing_dev_info;
         atomic_long_t           writeback;      /* number of writeback pages */
         int                     flags;          /* various flags */