linux-kernel - [PATCH v3 7/8] mm, hmm: Mark hmm_devmem_{add, add_resource} EXPORT_SYMBOL

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Date:   Mon, 18 Jun 2018 23:05:15 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     akpm@...ux-foundation.org
Cc:     Jérôme Glisse <jglisse@...hat.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Christoph Hellwig <hch@....de>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 7/8] mm, hmm: Mark hmm_devmem_{add,
 add_resource} EXPORT_SYMBOL_GPL

The routines hmm_devmem_add(), and hmm_devmem_add_resource() are
now wrappers around the functionality provided by devm_memremap_pages() to
inject a dev_pagemap instance and hook page-idle events. The
devm_memremap_pages() interface is base infrastructure for HMM which has
more and deeper ties into the kernel memory management implementation
than base ZONE_DEVICE.

Originally, the HMM page structure creation routines copied the
devm_memremap_pages() code and reused ZONE_DEVICE. A cleanup to unify
the implementations was discussed during the initial review:
http://lkml.iu.edu/hypermail/linux/kernel/1701.2/00812.html

Given that devm_memremap_pages() is marked EXPORT_SYMBOL_GPL by its
authors and the hmm_devmem_{add,add_resource} routines are simple
wrappers around that base, mark these routines as EXPORT_SYMBOL_GPL as
well.

Cc: "Jérôme Glisse" <jglisse@...hat.com>
Cc: Logan Gunthorpe <logang@...tatee.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 mm/hmm.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index b019d67a610e..481a7a5f6f46 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -1054,7 +1054,7 @@ struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops,
 		return result;
 	return devmem;
 }
-EXPORT_SYMBOL(hmm_devmem_add);
+EXPORT_SYMBOL_GPL(hmm_devmem_add);

 struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops,
 					   struct device *device,
@@ -1108,7 +1108,7 @@ struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops,
 		return result;
 	return devmem;
 }
-EXPORT_SYMBOL(hmm_devmem_add_resource);
+EXPORT_SYMBOL_GPL(hmm_devmem_add_resource);

 /*
  * A device driver that wants to handle multiple devices memory through a