linux-kernel - [PATCH v3 8/8] mm: Fix exports that inadvertently make put_page() EXPORT_SYMBOL

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Message-ID: <152938832086.17797.4538943238207602944.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:   Mon, 18 Jun 2018 23:05:20 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     akpm@...ux-foundation.org
Cc:     Joe Gorse <jhgorse@...il.com>, John Hubbard <jhubbard@...dia.com>,
        hch@....de, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 8/8] mm: Fix exports that inadvertently make put_page()
 EXPORT_SYMBOL_GPL

Now that all producers of dev_pagemap instances in the kernel are
properly converted to EXPORT_SYMBOL_GPL, fix up implicit consumers that
interact with dev_pagemap owners via put_page(). To reiterate,
dev_pagemap producers are EXPORT_SYMBOL_GPL because they adopt and
modify core memory management interfaces such that the dev_pagemap owner
can interact with all other kernel infrastructure and sub-systems
(drivers, filesystems, etc...) that consume page structures.

Fixes: e76384884344 ("mm: introduce MEMORY_DEVICE_FS_DAX and CONFIG_DEV_PAGEMAP_OPS")
Reported-by: Joe Gorse <jhgorse@...il.com>
Reported-by: John Hubbard <jhubbard@...dia.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 kernel/memremap.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/memremap.c b/kernel/memremap.c
index 16141b608b63..ecee37b44aa1 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -330,7 +330,7 @@ EXPORT_SYMBOL_GPL(get_dev_pagemap);
 
 #ifdef CONFIG_DEV_PAGEMAP_OPS
 DEFINE_STATIC_KEY_FALSE(devmap_managed_key);
-EXPORT_SYMBOL_GPL(devmap_managed_key);
+EXPORT_SYMBOL(devmap_managed_key);
 static atomic_t devmap_enable;
 
 /*
@@ -371,5 +371,5 @@ void __put_devmap_managed_page(struct page *page)
 	} else if (!count)
 		__put_page(page);
 }
-EXPORT_SYMBOL_GPL(__put_devmap_managed_page);
+EXPORT_SYMBOL(__put_devmap_managed_page);
 #endif /* CONFIG_DEV_PAGEMAP_OPS */