V4L/DVB (3667b): cpia2: fix function prototype

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

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 7029286..72248d1 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -616,12 +616,10 @@ static void guarantee_online_mems(const struct cpuset *cs, nodemask_t *pmask)
  * current->cpuset if a task has its memory placement changed.
  * Do not call this routine if in_interrupt().
  *
- * Call without callback_mutex or task_lock() held.  May be called
- * with or without manage_mutex held.  Doesn't need task_lock to guard
- * against another task changing a non-NULL cpuset pointer to NULL,
- * as that is only done by a task on itself, and if the current task
- * is here, it is not simultaneously in the exit code NULL'ing its
- * cpuset pointer.  This routine also might acquire callback_mutex and
+ * Call without callback_mutex or task_lock() held.  May be
+ * called with or without manage_mutex held.  Thanks in part to
+ * 'the_top_cpuset_hack', the tasks cpuset pointer will never
+ * be NULL.  This routine also might acquire callback_mutex and
  * current->mm->mmap_sem during call.
  *
  * Reading current->cpuset->mems_generation doesn't need task_lock
@@ -836,6 +834,55 @@ static int update_cpumask(struct cpuset *cs, char *buf)
 }
 
 /*
+ * cpuset_migrate_mm
+ *
+ *    Migrate memory region from one set of nodes to another.
+ *
+ *    Temporarilly set tasks mems_allowed to target nodes of migration,
+ *    so that the migration code can allocate pages on these nodes.
+ *
+ *    Call holding manage_mutex, so our current->cpuset won't change
+ *    during this call, as manage_mutex holds off any attach_task()
+ *    calls.  Therefore we don't need to take task_lock around the
+ *    call to guarantee_online_mems(), as we know no one is changing
+ *    our tasks cpuset.
+ *
+ *    Hold callback_mutex around the two modifications of our tasks
+ *    mems_allowed to synchronize with cpuset_mems_allowed().
+ *
+ *    While the mm_struct we are migrating is typically from some
+ *    other task, the task_struct mems_allowed that we are hacking
+ *    is for our current task, which must allocate new pages for that
+ *    migrating memory region.
+ *
+ *    We call cpuset_update_task_memory_state() before hacking
+ *    our tasks mems_allowed, so that we are assured of being in
+ *    sync with our tasks cpuset, and in particular, callbacks to
+ *    cpuset_update_task_memory_state() from nested page allocations
+ *    won't see any mismatch of our cpuset and task mems_generation
+ *    values, so won't overwrite our hacked tasks mems_allowed
+ *    nodemask.
+ */
+
+static void cpuset_migrate_mm(struct mm_struct *mm, const nodemask_t *from,
+                                                       const nodemask_t *to)
+{
+       struct task_struct *tsk = current;
+
+       cpuset_update_task_memory_state();
+
+       mutex_lock(&callback_mutex);
+       tsk->mems_allowed = *to;
+       mutex_unlock(&callback_mutex);
+
+       do_migrate_pages(mm, from, to, MPOL_MF_MOVE_ALL);
+
+       mutex_lock(&callback_mutex);
+       guarantee_online_mems(tsk->cpuset, &tsk->mems_allowed);
+       mutex_unlock(&callback_mutex);
+}
+
+/*
  * Handle user request to change the 'mems' memory placement
  * of a cpuset.  Needs to validate the request, update the
  * cpusets mems_allowed and mems_generation, and for each
@@ -947,10 +994,8 @@ static int update_nodemask(struct cpuset *cs, char *buf)
                struct mm_struct *mm = mmarray[i];
 
                mpol_rebind_mm(mm, &cs->mems_allowed);
-               if (migrate) {
-                       do_migrate_pages(mm, &oldmem, &cs->mems_allowed,
-                                                       MPOL_MF_MOVE_ALL);
-               }
+               if (migrate)
+                       cpuset_migrate_mm(mm, &oldmem, &cs->mems_allowed);
                mmput(mm);
        }
 
@@ -1185,11 +1230,11 @@ static int attach_task(struct cpuset *cs, char *pidbuf, char **ppathbuf)
        mm = get_task_mm(tsk);
        if (mm) {
                mpol_rebind_mm(mm, &to);
+               if (is_memory_migrate(cs))
+                       cpuset_migrate_mm(mm, &from, &to);
                mmput(mm);
        }
 
-       if (is_memory_migrate(cs))
-               do_migrate_pages(tsk->mm, &from, &to, MPOL_MF_MOVE_ALL);
        put_task_struct(tsk);
        synchronize_rcu();
        if (atomic_dec_and_test(&oldcs->count))
@@ -2205,7 +2250,7 @@ int __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
 {
        int node;                       /* node that zone z is on */
        const struct cpuset *cs;        /* current cpuset ancestors */
-       int allowed = 1;                /* is allocation in zone z allowed? */
+       int allowed;                    /* is allocation in zone z allowed? */
 
        if (in_interrupt())
                return 1;