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-rw-r--r--mm/backing-dev.c31
1 files changed, 10 insertions, 21 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index dbc6681..672c17b 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -331,7 +331,7 @@ static int bdi_forker_thread(void *ptr)
for (;;) {
bool fork = false;
struct task_struct *task;
- struct backing_dev_info *bdi, *tmp;
+ struct backing_dev_info *bdi;
/*
* Temporary measure, we want to make sure we don't see
@@ -347,7 +347,7 @@ static int bdi_forker_thread(void *ptr)
* Check if any existing bdi's have dirty data without
* a thread registered. If so, set that up.
*/
- list_for_each_entry_safe(bdi, tmp, &bdi_list, bdi_list) {
+ list_for_each_entry(bdi, &bdi_list, bdi_list) {
if (!bdi_cap_writeback_dirty(bdi))
continue;
if (bdi->wb.task)
@@ -359,8 +359,13 @@ static int bdi_forker_thread(void *ptr)
WARN(!test_bit(BDI_registered, &bdi->state),
"bdi %p/%s is not registered!\n", bdi, bdi->name);
- list_del_rcu(&bdi->bdi_list);
fork = true;
+
+ /*
+ * Set the pending bit - if someone will try to
+ * unregister this bdi - it'll wait on this bit.
+ */
+ set_bit(BDI_pending, &bdi->state);
break;
}
spin_unlock_bh(&bdi_lock);
@@ -383,29 +388,13 @@ static int bdi_forker_thread(void *ptr)
__set_current_state(TASK_RUNNING);
- /*
- * Set the pending bit - if someone will try to unregister this
- * bdi - it'll wait on this bit.
- */
- set_bit(BDI_pending, &bdi->state);
-
- /* Make sure no one uses the picked bdi */
- synchronize_rcu();
-
task = kthread_run(bdi_writeback_thread, &bdi->wb, "flush-%s",
dev_name(bdi->dev));
if (IS_ERR(task)) {
/*
- * If thread creation fails, then readd the bdi back to
- * the list and force writeout of the bdi from this
- * forker thread. That will free some memory and we can
- * try again. Add it to the tail so we get a chance to
- * flush other bdi's to free memory.
+ * If thread creation fails, force writeout of the bdi
+ * from the thread.
*/
- spin_lock_bh(&bdi_lock);
- list_add_tail_rcu(&bdi->bdi_list, &bdi_list);
- spin_unlock_bh(&bdi_lock);
-
bdi_flush_io(bdi);
} else
bdi->wb.task = task;
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