Events arriving in ovflist are stored in LIFO order, so
we should account for that when inserting them into rddlist.
Signed-off-by: Eric Wong <normalperson@xxxxxxxx>
Cc: Davide Libenzi <davidel@xxxxxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
I think this can lead to starvation in some rare cases, but I have not
been able to trigger it. The window for ovflist insertion is tiny.
fs/eventpoll.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 9fec183..5a1a596 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -598,7 +598,7 @@ static int ep_scan_ready_list(struct eventpoll *ep,
* contain them, and the list_splice() below takes care of them.
*/
if (!ep_is_linked(&epi->rdllink)) {
- list_add_tail(&epi->rdllink, &ep->rdllist);
+ list_add(&epi->rdllink, &ep->rdllist);
__pm_stay_awake(epi->ws);
}
}
--
Eric Wong
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