[RFC PATCH 1/3] userfaultfd: introduce userfaultfd_init_waitqueue helper
From: Mike Rapoport <hidden>
Date: 2017-10-25 16:24:01
Also in:
linux-mm
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
The helper can be used for initialization of wait queue entries for both page-fault and non-cooperative events Signed-off-by: Mike Rapoport <redacted> --- fs/userfaultfd.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 1c713fd5b3e6..efa8b4240039 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c@@ -131,6 +131,15 @@ static int userfaultfd_wake_function(wait_queue_entry_t *wq, unsigned mode, return ret; } +static inline void userfaultfd_init_waitqueue(struct userfaultfd_ctx *ctx, + struct userfaultfd_wait_queue *uwq) +{ + init_waitqueue_func_entry(&uwq->wq, userfaultfd_wake_function); + uwq->wq.private = current; + uwq->ctx = ctx; + uwq->waken = false; +} + /** * userfaultfd_ctx_get - Acquires a reference to the internal userfaultfd * context.
@@ -441,12 +450,9 @@ int handle_userfault(struct vm_fault *vmf, unsigned long reason) /* take the reference before dropping the mmap_sem */ userfaultfd_ctx_get(ctx); - init_waitqueue_func_entry(&uwq.wq, userfaultfd_wake_function); - uwq.wq.private = current; + userfaultfd_init_waitqueue(ctx, &uwq); uwq.msg = userfault_msg(vmf->address, vmf->flags, reason, ctx->features); - uwq.ctx = ctx; - uwq.waken = false; return_to_userland = (vmf->flags & (FAULT_FLAG_USER|FAULT_FLAG_KILLABLE)) ==
--
2.7.4
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