summaryrefslogtreecommitdiff
path: root/include/linux/sched.h
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-21 13:47:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-21 13:47:29 -0700
commit0214f46b3a0383d6e33c297e7706216b6a550e4b (patch)
tree98f94fa818963d4c2b5ad2a16cd97ec19d036dce /include/linux/sched.h
parent40fafdcbcd7a74e80ab0229b35bf6e497831e28f (diff)
parent84fe4cc09abc1a5ef3a282db3ed10f4d3f1e6a0b (diff)
Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull core signal handling updates from Eric Biederman: "It was observed that a periodic timer in combination with a sufficiently expensive fork could prevent fork from every completing. This contains the changes to remove the need for that restart. This set of changes is split into several parts: - The first part makes PIDTYPE_TGID a proper pid type instead something only for very special cases. The part starts using PIDTYPE_TGID enough so that in __send_signal where signals are actually delivered we know if the signal is being sent to a a group of processes or just a single process. - With that prep work out of the way the logic in fork is modified so that fork logically makes signals received while it is running appear to be received after the fork completes" * 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (22 commits) signal: Don't send signals to tasks that don't exist signal: Don't restart fork when signals come in. fork: Have new threads join on-going signal group stops fork: Skip setting TIF_SIGPENDING in ptrace_init_task signal: Add calculate_sigpending() fork: Unconditionally exit if a fatal signal is pending fork: Move and describe why the code examines PIDNS_ADDING signal: Push pid type down into complete_signal. signal: Push pid type down into __send_signal signal: Push pid type down into send_signal signal: Pass pid type into do_send_sig_info signal: Pass pid type into send_sigio_to_task & send_sigurg_to_task signal: Pass pid type into group_send_sig_info signal: Pass pid and pid type into send_sigqueue posix-timers: Noralize good_sigevent signal: Use PIDTYPE_TGID to clearly store where file signals will be sent pid: Implement PIDTYPE_TGID pids: Move the pgrp and session pid pointers from task_struct to signal_struct kvm: Don't open code task_pid in kvm_vcpu_ioctl pids: Compute task_tgid using signal->leader_pid ...
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h31
1 files changed, 6 insertions, 25 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 789923fbee3a..00de3e950dd4 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -779,7 +779,8 @@ struct task_struct {
struct list_head ptrace_entry;
/* PID/PID hash table linkage. */
- struct pid_link pids[PIDTYPE_MAX];
+ struct pid *thread_pid;
+ struct hlist_node pid_links[PIDTYPE_MAX];
struct list_head thread_group;
struct list_head thread_node;
@@ -1209,27 +1210,7 @@ struct task_struct {
static inline struct pid *task_pid(struct task_struct *task)
{
- return task->pids[PIDTYPE_PID].pid;
-}
-
-static inline struct pid *task_tgid(struct task_struct *task)
-{
- return task->group_leader->pids[PIDTYPE_PID].pid;
-}
-
-/*
- * Without tasklist or RCU lock it is not safe to dereference
- * the result of task_pgrp/task_session even if task == current,
- * we can race with another thread doing sys_setsid/sys_setpgid.
- */
-static inline struct pid *task_pgrp(struct task_struct *task)
-{
- return task->group_leader->pids[PIDTYPE_PGID].pid;
-}
-
-static inline struct pid *task_session(struct task_struct *task)
-{
- return task->group_leader->pids[PIDTYPE_SID].pid;
+ return task->thread_pid;
}
/*
@@ -1278,7 +1259,7 @@ static inline pid_t task_tgid_nr(struct task_struct *tsk)
*/
static inline int pid_alive(const struct task_struct *p)
{
- return p->pids[PIDTYPE_PID].pid != NULL;
+ return p->thread_pid != NULL;
}
static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
@@ -1304,12 +1285,12 @@ static inline pid_t task_session_vnr(struct task_struct *tsk)
static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
{
- return __task_pid_nr_ns(tsk, __PIDTYPE_TGID, ns);
+ return __task_pid_nr_ns(tsk, PIDTYPE_TGID, ns);
}
static inline pid_t task_tgid_vnr(struct task_struct *tsk)
{
- return __task_pid_nr_ns(tsk, __PIDTYPE_TGID, NULL);
+ return __task_pid_nr_ns(tsk, PIDTYPE_TGID, NULL);
}
static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)