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authorJan Kara <jack@suse.cz>2011-09-02 17:04:10 -0600
committerJens Axboe <jaxboe@fusionio.com>2011-09-02 17:17:02 -0600
commit09f40f98bfa2ac22a332a713629a2f8f92896834 (patch)
tree92fac9d374b195845cd859206c7dfd110fce21fb /mm/backing-dev.c
parent5a042aa4b8e994a15d2c2ee750219971f0ab3905 (diff)
downloadlinux-09f40f98bfa2ac22a332a713629a2f8f92896834.tar.gz
mm: Add comment explaining task state setting in bdi_forker_thread()
CC: Wu Fengguang <fengguang.wu@intel.com> CC: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'mm/backing-dev.c')
-rw-r--r--mm/backing-dev.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 94a047bb6c3..a87da524a4a 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -401,6 +401,13 @@ static int bdi_forker_thread(void *ptr)
}
spin_lock_bh(&bdi_lock);
+ /*
+ * In the following loop we are going to check whether we have
+ * some work to do without any synchronization with tasks
+ * waking us up to do work for them. So we have to set task
+ * state already here so that we don't miss wakeups coming
+ * after we verify some condition.
+ */
set_current_state(TASK_INTERRUPTIBLE);
list_for_each_entry(bdi, &bdi_list, bdi_list) {