The patch titled
Subject: userfaultfd: non-cooperative: Split the find_userfault() routine
has been added to the -mm tree. Its filename is
userfaultfd-non-cooperative-split-the-find_userfault-routine.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/userfaultfd-non-cooperative-split-the-find_userfault-routine.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/userfaultfd-non-cooperative-split-the-find_userfault-routine.patch
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------------------------------------------------------
From: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Subject: userfaultfd: non-cooperative: Split the find_userfault() routine
I will need one to lookup for userfaultfd_wait_queue-s in different
wait queue
Link: http://lkml.kernel.org/r/20161216144821.5183-6-aarcange@xxxxxxxxxx
Signed-off-by: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: "Dr. David Alan Gilbert" <dgilbert@xxxxxxxxxx>
Cc: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
Cc: Michael Rapoport <RAPOPORT@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/userfaultfd.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
diff -puN fs/userfaultfd.c~userfaultfd-non-cooperative-split-the-find_userfault-routine fs/userfaultfd.c
--- a/fs/userfaultfd.c~userfaultfd-non-cooperative-split-the-find_userfault-routine
+++ a/fs/userfaultfd.c
@@ -489,25 +489,30 @@ wakeup:
}
/* fault_pending_wqh.lock must be hold by the caller */
-static inline struct userfaultfd_wait_queue *find_userfault(
- struct userfaultfd_ctx *ctx)
+static inline struct userfaultfd_wait_queue *find_userfault_in(
+ wait_queue_head_t *wqh)
{
wait_queue_t *wq;
struct userfaultfd_wait_queue *uwq;
- VM_BUG_ON(!spin_is_locked(&ctx->fault_pending_wqh.lock));
+ VM_BUG_ON(!spin_is_locked(&wqh->lock));
uwq = NULL;
- if (!waitqueue_active(&ctx->fault_pending_wqh))
+ if (!waitqueue_active(wqh))
goto out;
/* walk in reverse to provide FIFO behavior to read userfaults */
- wq = list_last_entry(&ctx->fault_pending_wqh.task_list,
- typeof(*wq), task_list);
+ wq = list_last_entry(&wqh->task_list, typeof(*wq), task_list);
uwq = container_of(wq, struct userfaultfd_wait_queue, wq);
out:
return uwq;
}
+static inline struct userfaultfd_wait_queue *find_userfault(
+ struct userfaultfd_ctx *ctx)
+{
+ return find_userfault_in(&ctx->fault_pending_wqh);
+}
+
static unsigned int userfaultfd_poll(struct file *file, poll_table *wait)
{
struct userfaultfd_ctx *ctx = file->private_data;
_
Patches currently in -mm which might be from xemul@xxxxxxxxxxxxx are
userfaultfd-non-cooperative-split-the-find_userfault-routine.patch
userfaultfd-non-cooperative-add-ability-to-report-non-pf-events-from-uffd-descriptor.patch
userfaultfd-non-cooperative-add-fork-event.patch
userfaultfd-non-cooperative-add-mremap-event.patch
userfaultfd-non-cooperative-add-madvise-event-for-madv_dontneed-request.patch
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