ALSA: usb-audio: add support for Akai MPD16

[safe/jmp/linux-2.6] / kernel / exit.c

diff --git a/kernel/exit.c b/kernel/exit.c
index 546774a..eabca5a 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -55,7 +55,6 @@
 #include <asm/unistd.h>
 #include <asm/pgtable.h>
 #include <asm/mmu_context.h>
-#include "cred-internals.h"
 
 static void exit_mm(struct task_struct * tsk);
 
@@ -85,7 +84,9 @@ static void __exit_signal(struct task_struct *tsk)
        BUG_ON(!sig);
        BUG_ON(!atomic_read(&sig->count));
 
-       sighand = rcu_dereference(tsk->sighand);
+       sighand = rcu_dereference_check(tsk->sighand,
+                                       rcu_read_lock_held() ||
+                                       lockdep_tasklist_lock_is_held());
        spin_lock(&sighand->siglock);
 
        posix_cpu_timers_exit(tsk);
@@ -170,8 +171,10 @@ void release_task(struct task_struct * p)
 repeat:
        tracehook_prepare_release_task(p);
        /* don't need to get the RCU readlock here - the process is dead and
-        * can't be modifying its own credentials */
+        * can't be modifying its own credentials. But shut RCU-lockdep up */
+       rcu_read_lock();
        atomic_dec(&__task_cred(p)->user->processes);
+       rcu_read_unlock();
 
        proc_flush_task(p);
 
@@ -473,9 +476,11 @@ static void close_files(struct files_struct * files)
        /*
         * It is safe to dereference the fd table without RCU or
         * ->file_lock because this is the last reference to the
-        * files structure.
+        * files structure.  But use RCU to shut RCU-lockdep up.
         */
+       rcu_read_lock();
        fdt = files_fdtable(files);
+       rcu_read_unlock();
        for (;;) {
                unsigned long set;
                i = j * __NFDBITS;
@@ -521,10 +526,12 @@ void put_files_struct(struct files_struct *files)
                 * at the end of the RCU grace period. Otherwise,
                 * you can free files immediately.
                 */
+               rcu_read_lock();
                fdt = files_fdtable(files);
                if (fdt != &files->fdtab)
                        kmem_cache_free(files_cachep, files);
                free_fdtable(fdt);
+               rcu_read_unlock();
        }
 }
 
@@ -944,7 +951,9 @@ NORET_TYPE void do_exit(long code)
                                preempt_count());
 
        acct_update_integrals(tsk);
-
+       /* sync mm's RSS info before statistics gathering */
+       if (tsk->mm)
+               sync_mm_rss(tsk, tsk->mm);
        group_dead = atomic_dec_and_test(&tsk->signal->live);
        if (group_dead) {
                hrtimer_cancel(&tsk->signal->real_timer);
@@ -1180,7 +1189,7 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
 
        if (unlikely(wo->wo_flags & WNOWAIT)) {
                int exit_code = p->exit_code;
-               int why, status;
+               int why;
 
                get_task_struct(p);
                read_unlock(&tasklist_lock);