Freezer: make kernel threads nonfreezable by default

[net-next-2.6.git] / kernel / exit.c

diff --git a/kernel/exit.c b/kernel/exit.c
index ca6a11b730231bd0d6d9ece041e1a2f537223582..e8af8d0c2483232248ba163dc0e9eb03ad6ed504 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -31,6 +31,7 @@
 #include <linux/mempolicy.h>
 #include <linux/taskstats_kern.h>
 #include <linux/delayacct.h>
+#include <linux/freezer.h>
 #include <linux/cpuset.h>
 #include <linux/syscalls.h>
 #include <linux/signal.h>
@@ -387,6 +388,11 @@ void daemonize(const char *name, ...)
         * they would be locked into memory.
         */
        exit_mm(current);
+       /*
+        * We don't want to have TIF_FREEZE set if the system-wide hibernation
+        * or suspend transition begins right now.
+        */
+       current->flags |= PF_NOFREEZE;
 
        set_special_pids(1, 1);
        proc_clear_tty(current);
@@ -858,6 +864,34 @@ static void exit_notify(struct task_struct *tsk)
                release_task(tsk);
 }
 
+#ifdef CONFIG_DEBUG_STACK_USAGE
+static void check_stack_usage(void)
+{
+       static DEFINE_SPINLOCK(low_water_lock);
+       static int lowest_to_date = THREAD_SIZE;
+       unsigned long *n = end_of_stack(current);
+       unsigned long free;
+
+       while (*n == 0)
+               n++;
+       free = (unsigned long)n - (unsigned long)end_of_stack(current);
+
+       if (free >= lowest_to_date)
+               return;
+
+       spin_lock(&low_water_lock);
+       if (free < lowest_to_date) {
+               printk(KERN_WARNING "%s used greatest stack depth: %lu bytes "
+                               "left\n",
+                               current->comm, free);
+               lowest_to_date = free;
+       }
+       spin_unlock(&low_water_lock);
+}
+#else
+static inline void check_stack_usage(void) {}
+#endif
+
 fastcall NORET_TYPE void do_exit(long code)
 {
        struct task_struct *tsk = current;
@@ -937,6 +971,8 @@ fastcall NORET_TYPE void do_exit(long code)
        if (unlikely(tsk->compat_robust_list))
                compat_exit_robust_list(tsk);
 #endif
+       if (group_dead)
+               tty_audit_exit();
        if (unlikely(tsk->audit_context))
                audit_free(tsk);
 
@@ -949,6 +985,7 @@ fastcall NORET_TYPE void do_exit(long code)
        exit_sem(tsk);
        __exit_files(tsk);
        __exit_fs(tsk);
+       check_stack_usage();
        exit_thread();
        cpuset_exit(tsk);
        exit_keys(tsk);