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>

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 874d169..4cedc91 100644 (file)
--- 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 46d779a..1d8d5c8 100644 (file)
--- 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 1df7e45..24c8887 100644 (file)
--- 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 5d52753..b5f43a3 100644 (file)
--- 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 34fc6be..6a2e44f 100644 (file)
--- 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 */