author: David Woodhouse <dwmw@amazon.co.uk> 2020-10-27 13:55:21 +0000
committer: Paolo Bonzini <pbonzini@redhat.com> 2020-11-15 09:49:10 -0500
commit: 28f1326710555bbe666f64452d08f2d7dd657cae
parent: e8dbf19508a112d125190df77ee0464b7ba56192
Commit Summary:
Diffstat:
1 file changed, 4 insertions, 1 deletion
diff --git a/fs/eventfd.c b/fs/eventfd.c
index df466ef81ddd..e265b6dd4f34 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -182,11 +182,14 @@ static __poll_t eventfd_poll(struct file *file, poll_table *wait)
return events;
}
-static void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt)
+void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt)
{
+ lockdep_assert_held(&ctx->wqh.lock);
+
*cnt = (ctx->flags & EFD_SEMAPHORE) ? 1 : ctx->count;
ctx->count -= *cnt;
}
+EXPORT_SYMBOL_GPL(eventfd_ctx_do_read);
/**
* eventfd_ctx_remove_wait_queue - Read the current counter and removes wait queue.