v4.19.13 snapshot.
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
new file mode 100644
index 0000000..ee7e987
--- /dev/null
+++ b/include/linux/posix-timers.h
@@ -0,0 +1,130 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _linux_POSIX_TIMERS_H
+#define _linux_POSIX_TIMERS_H
+
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/sched.h>
+#include <linux/timex.h>
+#include <linux/alarmtimer.h>
+
+struct siginfo;
+
+struct cpu_timer_list {
+ struct list_head entry;
+ u64 expires, incr;
+ struct task_struct *task;
+ int firing;
+};
+
+/*
+ * Bit fields within a clockid:
+ *
+ * The most significant 29 bits hold either a pid or a file descriptor.
+ *
+ * Bit 2 indicates whether a cpu clock refers to a thread or a process.
+ *
+ * Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3.
+ *
+ * A clockid is invalid if bits 2, 1, and 0 are all set.
+ */
+#define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3))
+#define CPUCLOCK_PERTHREAD(clock) \
+ (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
+
+#define CPUCLOCK_PERTHREAD_MASK 4
+#define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
+#define CPUCLOCK_CLOCK_MASK 3
+#define CPUCLOCK_PROF 0
+#define CPUCLOCK_VIRT 1
+#define CPUCLOCK_SCHED 2
+#define CPUCLOCK_MAX 3
+#define CLOCKFD CPUCLOCK_MAX
+#define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)
+
+static inline clockid_t make_process_cpuclock(const unsigned int pid,
+ const clockid_t clock)
+{
+ return ((~pid) << 3) | clock;
+}
+static inline clockid_t make_thread_cpuclock(const unsigned int tid,
+ const clockid_t clock)
+{
+ return make_process_cpuclock(tid, clock | CPUCLOCK_PERTHREAD_MASK);
+}
+
+static inline clockid_t fd_to_clockid(const int fd)
+{
+ return make_process_cpuclock((unsigned int) fd, CLOCKFD);
+}
+
+static inline int clockid_to_fd(const clockid_t clk)
+{
+ return ~(clk >> 3);
+}
+
+#define REQUEUE_PENDING 1
+
+/**
+ * struct k_itimer - POSIX.1b interval timer structure.
+ * @list: List head for binding the timer to signals->posix_timers
+ * @t_hash: Entry in the posix timer hash table
+ * @it_lock: Lock protecting the timer
+ * @kclock: Pointer to the k_clock struct handling this timer
+ * @it_clock: The posix timer clock id
+ * @it_id: The posix timer id for identifying the timer
+ * @it_active: Marker that timer is active
+ * @it_overrun: The overrun counter for pending signals
+ * @it_overrun_last: The overrun at the time of the last delivered signal
+ * @it_requeue_pending: Indicator that timer waits for being requeued on
+ * signal delivery
+ * @it_sigev_notify: The notify word of sigevent struct for signal delivery
+ * @it_interval: The interval for periodic timers
+ * @it_signal: Pointer to the creators signal struct
+ * @it_pid: The pid of the process/task targeted by the signal
+ * @it_process: The task to wakeup on clock_nanosleep (CPU timers)
+ * @sigq: Pointer to preallocated sigqueue
+ * @it: Union representing the various posix timer type
+ * internals. Also used for rcu freeing the timer.
+ */
+struct k_itimer {
+ struct list_head list;
+ struct hlist_node t_hash;
+ spinlock_t it_lock;
+ const struct k_clock *kclock;
+ clockid_t it_clock;
+ timer_t it_id;
+ int it_active;
+ s64 it_overrun;
+ s64 it_overrun_last;
+ int it_requeue_pending;
+ int it_sigev_notify;
+ ktime_t it_interval;
+ struct signal_struct *it_signal;
+ union {
+ struct pid *it_pid;
+ struct task_struct *it_process;
+ };
+ struct sigqueue *sigq;
+ union {
+ struct {
+ struct hrtimer timer;
+ } real;
+ struct cpu_timer_list cpu;
+ struct {
+ struct alarm alarmtimer;
+ } alarm;
+ struct rcu_head rcu;
+ } it;
+};
+
+void run_posix_cpu_timers(struct task_struct *task);
+void posix_cpu_timers_exit(struct task_struct *task);
+void posix_cpu_timers_exit_group(struct task_struct *task);
+void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
+ u64 *newval, u64 *oldval);
+
+void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
+
+void posixtimer_rearm(struct siginfo *info);
+#endif