linux-kernel - [PATCH 17/17] memremap: merge find_dev_pagemap into get_dev

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Message-Id: <20171229075406.1936-18-hch@lst.de>
Date:   Fri, 29 Dec 2017 08:54:06 +0100
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Jérôme Glisse <jglisse@...hat.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Michal Hocko <mhocko@...nel.org>, linux-nvdimm@...ts.01.org,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 17/17] memremap: merge find_dev_pagemap into get_dev_pagemap

There is only one caller of the trivial function find_dev_pagemap left,
so just merge it into the caller.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Dan Williams <dan.j.williams@...el.com>
---
 kernel/memremap.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/kernel/memremap.c b/kernel/memremap.c
index a9a948cd3d7f..ada31b0d76d4 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -306,14 +306,6 @@ static void devm_memremap_pages_release(void *data)
 		      "%s: failed to free all reserved pages\n", __func__);
 }
 
-/* assumes rcu_read_lock() held at entry */
-static struct dev_pagemap *find_dev_pagemap(resource_size_t phys)
-{
-	WARN_ON_ONCE(!rcu_read_lock_held());
-
-	return radix_tree_lookup(&pgmap_radix, PHYS_PFN(phys));
-}
-
 /**
  * devm_memremap_pages - remap and provide memmap backing for the given resource
  * @dev: hosting device for @res
@@ -466,7 +458,7 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
 
 	/* fall back to slow path lookup */
 	rcu_read_lock();
-	pgmap = find_dev_pagemap(phys);
+	pgmap = radix_tree_lookup(&pgmap_radix, PHYS_PFN(phys));
 	if (pgmap && !percpu_ref_tryget_live(pgmap->ref))
 		pgmap = NULL;
 	rcu_read_unlock();
-- 
2.14.2