[PATCH 09/33] userfaultfd: non-cooperative: Add fork() event, build warning fix

[Andrea Arcangeli <aarcange@redhat.com>]

It was harmless, but 32bit kernel builds would emit warnings if not
passing through an (unsigned long) cast of the pointer, before storing
it in a __u64.

Warning found by the kbuild test robot.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
---
 fs/userfaultfd.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 1de16c9..07b1c25 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -543,7 +543,7 @@ static int dup_fctx(struct userfaultfd_fork_ctx *fctx)
 	msg_init(&ewq.msg);
 
 	ewq.msg.event = UFFD_EVENT_FORK;
-	ewq.msg.arg.reserved.reserved1 = (__u64)fctx->new;
+	ewq.msg.arg.reserved.reserved1 = (unsigned long)fctx->new;
 
 	return userfaultfd_event_wait_completion(ctx, &ewq);
 }
@@ -797,7 +797,9 @@ static ssize_t userfaultfd_ctx_read(struct userfaultfd_ctx *ctx, int no_wait,
 			*msg = uwq->msg;
 
 			if (uwq->msg.event == UFFD_EVENT_FORK) {
-				fork_nctx = (struct userfaultfd_ctx *)uwq->msg.arg.reserved.reserved1;
+				fork_nctx = (struct userfaultfd_ctx *)
+					(unsigned long)
+					uwq->msg.arg.reserved.reserved1;
 				list_move(&uwq->wq.task_list, &fork_event);
 				spin_unlock(&ctx->event_wqh.lock);
 				ret = 0;

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