1 files changed, 29 insertions, 0 deletions

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 68c96376e84a..2c076b36c4f6 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -967,6 +967,7 @@ static void check_thread_timers(struct task_struct *tsk,
 {
         int maxfire;
         struct list_head *timers = tsk->cpu_timers;
+        struct signal_struct *const sig = tsk->signal;
 
         maxfire = 20;
         tsk->it_prof_expires = cputime_zero;
@@ -1011,6 +1012,34 @@ static void check_thread_timers(struct task_struct *tsk,
                 t->firing = 1;
                 list_move_tail(&t->entry, firing);
         }
+
+        /*
+         * Check for the special case thread timers.
+         */
+        if (sig->rlim[RLIMIT_RTTIME].rlim_cur != RLIM_INFINITY) {
+                unsigned long hard = sig->rlim[RLIMIT_RTTIME].rlim_max;
+                unsigned long *soft = &sig->rlim[RLIMIT_RTTIME].rlim_cur;
+
+                if (tsk->rt.timeout > DIV_ROUND_UP(hard, USEC_PER_SEC/HZ)) {
+                        /*
+                         * At the hard limit, we just die.
+                         * No need to calculate anything else now.
+                         */
+                        __group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk);
+                        return;
+                }
+                if (tsk->rt.timeout > DIV_ROUND_UP(*soft, USEC_PER_SEC/HZ)) {
+                        /*
+                         * At the soft limit, send a SIGXCPU every second.
+                         */
+                        if (sig->rlim[RLIMIT_RTTIME].rlim_cur
+                            < sig->rlim[RLIMIT_RTTIME].rlim_max) {
+                                sig->rlim[RLIMIT_RTTIME].rlim_cur +=
+                                                                USEC_PER_SEC;
+                        }
+                        __group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk);
+                }
+        }
 }
 
 /*