mm/hwpoison: change argument struct page **hpagep to *hpage

It's unnecessary to pass in a struct page **hpagep because it's never
modified.  Changing to use *hpage to simplify the code.

Link: https://lkml.kernel.org/r/20210814105131.48814-4-linmiaohe@huawei.comSigned-off-by: NMiaohe Lin <linmiaohe@huawei.com>
Acked-by: NNaoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/memory-failure.c

@@ -1271,14 +1271,13 @@ static int get_hwpoison_page(struct page *p, unsigned long flags)
  * the pages and send SIGBUS to the processes if the data was dirty.
  */
 static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
-				  int flags, struct page **hpagep)
+				  int flags, struct page *hpage)
 {
 	enum ttu_flags ttu = TTU_IGNORE_MLOCK | TTU_SYNC;
 	struct address_space *mapping;
 	LIST_HEAD(tokill);
 	bool unmap_success;
 	int kill = 1, forcekill;
-	struct page *hpage = *hpagep;
 	bool mlocked = PageMlocked(hpage);
 
 	/*
@@ -1503,7 +1502,7 @@ static int memory_failure_hugetlb(unsigned long pfn, int flags)
 		goto out;
 	}
 
-	if (!hwpoison_user_mappings(p, pfn, flags, &head)) {
+	if (!hwpoison_user_mappings(p, pfn, flags, head)) {
 		action_result(pfn, MF_MSG_UNMAP_FAILED, MF_IGNORED);
 		res = -EBUSY;
 		goto out;
@@ -1783,7 +1782,7 @@ int memory_failure(unsigned long pfn, int flags)
 	 * Now take care of user space mappings.
 	 * Abort on fail: __delete_from_page_cache() assumes unmapped page.
 	 */
-	if (!hwpoison_user_mappings(p, pfn, flags, &p)) {
+	if (!hwpoison_user_mappings(p, pfn, flags, p)) {
 		action_result(pfn, MF_MSG_UNMAP_FAILED, MF_IGNORED);
 		res = -EBUSY;
 		goto unlock_page;