mm/hmm: constify hmm_devmem_page_get_drvdata() parameter

Constify pointer parameter to avoid issue when use from code that only has const struct page pointer to use in the first place. Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ralph Campbell <[email protected]> Signed-off-by: Jérôme Glisse <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
kyagi · Nov 16, 2017 · 0bea803 · 0bea803
1 parent 007ab7b
commit 0bea803
Showing 1 changed file with 2 additions and 2 deletions.
diff --git 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];
 }