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| author | Sukadev Bhattiprolu <sukadev@us.ibm.com> | 2007-05-11 09:23:00 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-11 19:29:35 +0400 |
| commit | 820e45db2380eb1545fa2bc5d34b8b2f2933faeb (patch) | |
| tree | 426e89e9205e44559d949d9cdf8bf1035bdc3710 | |
| parent | e713d0dab21a68500720e222fa02567fc7dfb14b (diff) | |
| download | linux-820e45db2380eb1545fa2bc5d34b8b2f2933faeb.tar.xz | |
statically initialize struct pid for swapper
Statically initialize a struct pid for the swapper process (pid_t == 0) and
attach it to init_task. This is needed so task_pid(), task_pgrp() and
task_session() interfaces work on the swapper process also.
Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: <containers@lists.osdl.org>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/init_task.h | 27 | ||||
| -rw-r--r-- | include/linux/pid.h | 2 | ||||
| -rw-r--r-- | kernel/pid.c | 2 |
3 files changed, 31 insertions, 0 deletions
diff --git a/include/linux/init_task.h b/include/linux/init_task.h index 45170b2fa253..a68835fc8c04 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -88,6 +88,28 @@ extern struct nsproxy init_nsproxy; extern struct group_info init_groups; +#define INIT_STRUCT_PID { \ + .count = ATOMIC_INIT(1), \ + .nr = 0, \ + /* Don't put this struct pid in pid_hash */ \ + .pid_chain = { .next = NULL, .pprev = NULL }, \ + .tasks = { \ + { .first = &init_task.pids[PIDTYPE_PID].node }, \ + { .first = &init_task.pids[PIDTYPE_PGID].node }, \ + { .first = &init_task.pids[PIDTYPE_SID].node }, \ + }, \ + .rcu = RCU_HEAD_INIT, \ +} + +#define INIT_PID_LINK(type) \ +{ \ + .node = { \ + .next = NULL, \ + .pprev = &init_struct_pid.tasks[type].first, \ + }, \ + .pid = &init_struct_pid, \ +} + /* * INIT_TASK is used to set up the first task table, touch at * your own risk!. Base=0, limit=0x1fffff (=2MB) @@ -139,6 +161,11 @@ extern struct group_info init_groups; .cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \ .fs_excl = ATOMIC_INIT(0), \ .pi_lock = __SPIN_LOCK_UNLOCKED(tsk.pi_lock), \ + .pids = { \ + [PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \ + [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID), \ + [PIDTYPE_SID] = INIT_PID_LINK(PIDTYPE_SID), \ + }, \ INIT_TRACE_IRQFLAGS \ INIT_LOCKDEP \ } diff --git a/include/linux/pid.h b/include/linux/pid.h index 33d343880d89..1e0e4e3423a6 100644 --- a/include/linux/pid.h +++ b/include/linux/pid.h @@ -51,6 +51,8 @@ struct pid struct rcu_head rcu; }; +extern struct pid init_struct_pid; + struct pid_link { struct hlist_node node; diff --git a/kernel/pid.c b/kernel/pid.c index d76f59326bd4..eb66bd2953ab 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -27,11 +27,13 @@ #include <linux/bootmem.h> #include <linux/hash.h> #include <linux/pid_namespace.h> +#include <linux/init_task.h> #define pid_hashfn(nr) hash_long((unsigned long)nr, pidhash_shift) static struct hlist_head *pid_hash; static int pidhash_shift; static struct kmem_cache *pid_cachep; +struct pid init_struct_pid = INIT_STRUCT_PID; int pid_max = PID_MAX_DEFAULT; |