RE: [PATCH v11 1/4] RDMA/umem: Support importing dma-buf as user memory region

["Xiong, Jianxin" <jianxin.xiong@intel.com>]

> -----Original Message-----
> From: Christoph Hellwig <hch@infradead.org>
> Sent: Tuesday, November 24, 2020 1:34 AM
> To: Xiong, Jianxin <jianxin.xiong@intel.com>
> Cc: linux-rdma@vger.kernel.org; dri-devel@lists.freedesktop.org; Doug Ledford <dledford@redhat.com>; Jason Gunthorpe <jgg@ziepe.ca>;
> Leon Romanovsky <leon@kernel.org>; Sumit Semwal <sumit.semwal@linaro.org>; Christian Koenig <christian.koenig@amd.com>; Vetter,
> Daniel <daniel.vetter@intel.com>
> Subject: Re: [PATCH v11 1/4] RDMA/umem: Support importing dma-buf as user memory region
> 
> As these are mostly trivial wrappers around the EXPORT_SYMBOL_GPL dmabuf exports please stick to that export style.
> 
> > --- /dev/null
> > +++ b/drivers/infiniband/core/umem_dmabuf.h
> > @@ -0,0 +1,11 @@
> > +/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
> > +/*
> > + * Copyright (c) 2020 Intel Corporation. All rights reserved.
> > + */
> > +
> > +#ifndef UMEM_DMABUF_H
> > +#define UMEM_DMABUF_H
> > +
> > +void ib_umem_dmabuf_release(struct ib_umem_dmabuf *umem_dmabuf);
> > +
> > +#endif /* UMEM_DMABUF_H */
> 
> Does this really need a separate header?

The symbol doesn't need to be exported otherwise it can be put into "ib_umem.h".
Although the prototype could be put into the file where it is called directly, using a
separate header file provides a cleaner interface.