linux-kernel - [PATCH] mm/hmm: constify hmm_devmem_page_get

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Date:   Mon,  2 Oct 2017 15:32:54 -0400
From:   Jérôme Glisse <jglisse@...hat.com>
To:     <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Cc:     Ralph Campbell <rcampbell@...dia.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] mm/hmm: constify hmm_devmem_page_get_drvdata() parameter

From: Ralph Campbell <rcampbell@...dia.com>

Constify pointer parameter to avoid issue when use from code that
only has const struct page pointer to use in the first place.

Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 include/linux/hmm.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index 96e6997..325017a 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -471,9 +471,9 @@ static inline void hmm_devmem_page_set_drvdata(struct page *page,
  * @page: pointer to struct page
  * Return: driver data value
  */
-static inline unsigned long hmm_devmem_page_get_drvdata(struct page *page)
+static inline unsigned long hmm_devmem_page_get_drvdata(const struct page *page)
 {
-	unsigned long *drvdata = (unsigned long *)&page->pgmap;
+	const unsigned long *drvdata = (const unsigned long *)&page->pgmap;
 
 	return drvdata[1];
 }
-- 
2.4.11