kernel: __rcu annotations

This adds annotations for RCU operations in core kernel components

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

diff --git a/include/linux/fdtable.h b/include/linux/fdtable.h
index f59ed29..133c0ba 100644 (file)
--- a/include/linux/fdtable.h
+++ b/include/linux/fdtable.h
@@ -31,7 +31,7 @@ struct embedded_fd_set {
 
 struct fdtable {
        unsigned int max_fds;
-       struct file ** fd;      /* current fd array */
+       struct file __rcu **fd;      /* current fd array */
        fd_set *close_on_exec;
        fd_set *open_fds;
        struct rcu_head rcu;
@@ -46,7 +46,7 @@ struct files_struct {
    * read mostly part
    */
        atomic_t count;
-       struct fdtable *fdt;
+       struct fdtable __rcu *fdt;
        struct fdtable fdtab;
   /*
    * written part on a separate cache line in SMP
@@ -55,7 +55,7 @@ struct files_struct {
        int next_fd;
        struct embedded_fd_set close_on_exec_init;
        struct embedded_fd_set open_fds_init;
-       struct file * fd_array[NR_OPEN_DEFAULT];
+       struct file __rcu * fd_array[NR_OPEN_DEFAULT];
 };
 
 #define rcu_dereference_check_fdtable(files, fdtfd) \

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 76041b6..aa3dc8d 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1380,7 +1380,7 @@ struct super_block {
         * Saved mount options for lazy filesystems using
         * generic_show_options()
         */
-       char *s_options;
+       char __rcu *s_options;
 };
 
 extern struct timespec current_fs_time(struct super_block *sb);

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 5f2f4c4..af3f06b 100644 (file)
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -129,8 +129,8 @@ struct blk_scsi_cmd_filter {
 struct disk_part_tbl {
        struct rcu_head rcu_head;
        int len;
-       struct hd_struct *last_lookup;
-       struct hd_struct *part[];
+       struct hd_struct __rcu *last_lookup;
+       struct hd_struct __rcu *part[];
 };
 
 struct gendisk {
@@ -149,7 +149,7 @@ struct gendisk {
         * non-critical accesses use RCU.  Always access through
         * helpers.
         */
-       struct disk_part_tbl *part_tbl;
+       struct disk_part_tbl __rcu *part_tbl;
        struct hd_struct part0;
 
        const struct block_device_operations *fops;

diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 1f43fa5..6460fc6 100644 (file)
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -137,8 +137,8 @@ extern struct cred init_cred;
        .children       = LIST_HEAD_INIT(tsk.children),                 \
        .sibling        = LIST_HEAD_INIT(tsk.sibling),                  \
        .group_leader   = &tsk,                                         \
-       .real_cred      = &init_cred,                                   \
-       .cred           = &init_cred,                                   \
+       RCU_INIT_POINTER(.real_cred, &init_cred),                       \
+       RCU_INIT_POINTER(.cred, &init_cred),                            \
        .cred_guard_mutex =                                             \
                 __MUTEX_INITIALIZER(tsk.cred_guard_mutex),             \
        .comm           = "swapper",                                    \

diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h
index 64d5291..3e70b21 100644 (file)
--- a/include/linux/iocontext.h
+++ b/include/linux/iocontext.h
@@ -53,7 +53,7 @@ struct io_context {
 
        struct radix_tree_root radix_root;
        struct hlist_head cic_list;
-       void *ioc_data;
+       void __rcu *ioc_data;
 };
 
 static inline struct io_context *ioc_task_link(struct io_context *ioc)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index b8bb9a6..05537a5 100644 (file)
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -299,7 +299,7 @@ struct mm_struct {
         * new_owner->mm == mm
         * new_owner->alloc_lock is held
         */
-       struct task_struct *owner;
+       struct task_struct __rcu *owner;
 #endif
 
 #ifdef CONFIG_PROC_FS