The patch titled
epoll: send POLLHUP on ->release
has been removed from the -mm tree. Its filename was
epoll-send-pollhup-on-release.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: epoll: send POLLHUP on ->release
From: Davide Libenzi <davidel@xxxxxxxxxxxxxxx>
Allow waiters to be notified about the eventfd file* going away, and give
them a change to unregister from the wait queue. This is turn allows
eventfd users to use the eventfd file* w/out holding a live reference to
it.
After the eventfd user callbacks returns, any usage of the eventfd file*
should be dropped. The eventfd user callback can acquire sleepy locks
since it is invoked lockless.
This is a feature, needed by KVM to avoid an awkward workaround when using
eventdf.
Signed-off-by: Davide Libenzi <davidel@xxxxxxxxxxxxxxx>
Tested-by: Gregory Haskins <ghaskins@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/eventfd.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff -puN fs/eventfd.c~epoll-send-pollhup-on-release fs/eventfd.c
--- a/fs/eventfd.c~epoll-send-pollhup-on-release
+++ a/fs/eventfd.c
@@ -61,7 +61,15 @@ EXPORT_SYMBOL_GPL(eventfd_signal);
static int eventfd_release(struct inode *inode, struct file *file)
{
- kfree(file->private_data);
+ struct eventfd_ctx *ctx = file->private_data;
+
+ /*
+ * No need to hold the lock here, since we are on the file cleanup
+ * path and the ones still attached to the wait queue will be
+ * serialized by wake_up_locked_poll().
+ */
+ wake_up_locked_poll(&ctx->wqh, POLLHUP);
+ kfree(ctx);
return 0;
}
_
Patches currently in -mm which might be from davidel@xxxxxxxxxxxxxxx are
linux-next.patch
poll-avoid-extra-wakeups-in-select-poll.patch
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