Messages in this thread Patch in this message | | | From | Arnd Bergmann <> | Subject | [PATCH 08/10] pid: __rcu annotations | Date | Wed, 24 Feb 2010 21:04:04 +0100 |
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This demonstrates static initialization of __rcu annotated variables using RCU_INIT_POINTER.
Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- include/linux/init_task.h | 6 +++--- include/linux/pid.h | 9 +++++---- kernel/pid.c | 8 ++++---- 3 files changed, 12 insertions(+), 11 deletions(-)
diff --git a/include/linux/init_task.h b/include/linux/init_task.h index abec69b..c9cf902 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -53,9 +53,9 @@ extern struct group_info init_groups; #define INIT_STRUCT_PID { \ .count = ATOMIC_INIT(1), \ .tasks = { \ - { .first = &init_task.pids[PIDTYPE_PID].node }, \ - { .first = &init_task.pids[PIDTYPE_PGID].node }, \ - { .first = &init_task.pids[PIDTYPE_SID].node }, \ + { RCU_INIT_POINTER(.first, &init_task.pids[PIDTYPE_PID].node) }, \ + { RCU_INIT_POINTER(.first, &init_task.pids[PIDTYPE_PGID].node) }, \ + { RCU_INIT_POINTER(.first, &init_task.pids[PIDTYPE_SID].node) }, \ }, \ .rcu = RCU_HEAD_INIT, \ .level = 0, \ diff --git a/include/linux/pid.h b/include/linux/pid.h index 49f1c2f..8eb2aa1 100644 --- a/include/linux/pid.h +++ b/include/linux/pid.h @@ -2,6 +2,7 @@ #define _LINUX_PID_H #include <linux/rcupdate.h> +#include <linux/rculist.h> enum pid_type { @@ -51,7 +52,7 @@ struct upid { /* Try to keep pid_chain in the same cacheline as nr for find_vpid */ int nr; struct pid_namespace *ns; - struct hlist_node pid_chain; + struct rcu_hlist_node pid_chain; }; struct pid @@ -59,7 +60,7 @@ struct pid atomic_t count; unsigned int level; /* lists of tasks that use this pid */ - struct hlist_head tasks[PIDTYPE_MAX]; + struct rcu_hlist_head tasks[PIDTYPE_MAX]; struct rcu_head rcu; struct upid numbers[1]; }; @@ -68,7 +69,7 @@ extern struct pid init_struct_pid; struct pid_link { - struct hlist_node node; + struct rcu_hlist_node node; struct pid *pid; }; @@ -164,7 +165,7 @@ pid_t pid_vnr(struct pid *pid); #define do_each_pid_task(pid, type, task) \ do { \ - struct hlist_node *pos___; \ + struct rcu_hlist_node *pos___; \ if ((pid) != NULL) \ hlist_for_each_entry_rcu((task), pos___, \ &(pid)->tasks[type], pids[type].node) { diff --git a/kernel/pid.c b/kernel/pid.c index 2e17c9c..871d75e 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -39,7 +39,7 @@ #define pid_hashfn(nr, ns) \ hash_long((unsigned long)nr + (unsigned long)ns, pidhash_shift) -static struct hlist_head *pid_hash; +static struct rcu_hlist_head *pid_hash; static unsigned int pidhash_shift = 4; struct pid init_struct_pid = INIT_STRUCT_PID; @@ -290,7 +290,7 @@ out_free: struct pid *find_pid_ns(int nr, struct pid_namespace *ns) { - struct hlist_node *elem; + struct rcu_hlist_node *elem; struct upid *pnr; hlist_for_each_entry_rcu(pnr, elem, @@ -336,7 +336,7 @@ static void __change_pid(struct task_struct *task, enum pid_type type, link->pid = new; for (tmp = PIDTYPE_MAX; --tmp >= 0; ) - if (!hlist_empty(&pid->tasks[tmp])) + if (!hlist_empty_rcu(&pid->tasks[tmp])) return; free_pid(pid); @@ -366,7 +366,7 @@ struct task_struct *pid_task(struct pid *pid, enum pid_type type) { struct task_struct *result = NULL; if (pid) { - struct hlist_node *first; + struct rcu_hlist_node *first; first = rcu_dereference(pid->tasks[type].first); if (first) result = hlist_entry(first, struct task_struct, pids[(type)].node); -- 1.6.3.3
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