The patch titled
Subject: fs-epoll-deal-with-wait_queue-only-once-fix
has been added to the -mm tree. Its filename is
fs-epoll-deal-with-wait_queue-only-once-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fs-epoll-deal-with-wait_queue-only-once-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fs-epoll-deal-with-wait_queue-only-once-fix.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: fs-epoll-deal-with-wait_queue-only-once-fix
restore code to original position, fix and reflow comment
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Davidlohr Bueso <dbueso@xxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Jason Baron <jbaron@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/eventpoll.c | 23 +++++++++++------------
1 file changed, 11 insertions(+), 12 deletions(-)
--- a/fs/eventpoll.c~fs-epoll-deal-with-wait_queue-only-once-fix
+++ a/fs/eventpoll.c
@@ -1787,15 +1787,6 @@ fetch_events:
if (eavail)
goto send_events;
- if (!waiter) {
- waiter = true;
- init_waitqueue_entry(&wait, current);
-
- spin_lock_irq(&ep->wq.lock);
- __add_wait_queue_exclusive(&ep->wq, &wait);
- spin_unlock_irq(&ep->wq.lock);
- }
-
/*
* Busy poll timed out. Drop NAPI ID for now, we can add
* it back in when we have moved a socket with a valid NAPI
@@ -1804,10 +1795,18 @@ fetch_events:
ep_reset_busy_poll_napi_id(ep);
/*
- * We don't have any available event to return to the caller.
- * We need to sleep here, and we will be wake up by
- * ep_poll_callback() when events will become available.
+ * We don't have any available event to return to the caller. We need
+ * to sleep here, and we will be woken by ep_poll_callback() when events
+ * become available.
*/
+ if (!waiter) {
+ waiter = true;
+ init_waitqueue_entry(&wait, current);
+
+ spin_lock_irq(&ep->wq.lock);
+ __add_wait_queue_exclusive(&ep->wq, &wait);
+ spin_unlock_irq(&ep->wq.lock);
+ }
for (;;) {
/*
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
arm-arch-arm-include-asm-pageh-needs-personalityh.patch
mm.patch
mm-slab-remove-unnecessary-unlikely-fix.patch
mm-slub-record-final-state-of-slub-action-in-deactivate_slab-fix.patch
mm-page_owner-clamp-read-count-to-page_size-fix.patch
mm-hotplug-optimize-clear_hwpoisoned_pages-fix.patch
mm-ksm-do-not-block-on-page-lock-when-searching-stable-tree-fix.patch
mm-memory_hotplug-print-reason-for-the-offlining-failure-fix.patch
mm-convert-totalram_pages-and-totalhigh_pages-variables-to-atomic-checkpatch-fixes.patch
memory_hotplug-free-pages-as-higher-order-fix.patch
fs-epoll-deal-with-wait_queue-only-once-fix.patch
exec-separate-mm_anonpages-and-rlimit_stack-accounting-checkpatch-fixes.patch
ipc-allow-boot-time-extension-of-ipcmni-from-32k-to-8m-checkpatch-fixes.patch
kernel-forkc-export-kernel_thread-to-modules.patch
slab-leaks3-default-y.patch
