linux-kernel - [PATCH v5 08/16] mm,hwpoison: remove MF_COUNT

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Date:   Fri, 31 Jul 2020 12:21:04 +0000
From:   nao.horiguchi@...il.com
To:     linux-mm@...ck.org
Cc:     mhocko@...nel.org, akpm@...ux-foundation.org,
        mike.kravetz@...cle.com, osalvador@...e.de, tony.luck@...el.com,
        david@...hat.com, aneesh.kumar@...ux.vnet.ibm.com,
        zeil@...dex-team.ru, cai@....pw, naoya.horiguchi@....com,
        linux-kernel@...r.kernel.org
Subject: [PATCH v5 08/16] mm,hwpoison: remove MF_COUNT_INCREASED

From: Naoya Horiguchi <naoya.horiguchi@....com>

Now there's no user of MF_COUNT_INCREASED, so we can safely remove
it from all calling points.

Signed-off-by: Naoya Horiguchi <naoya.horiguchi@....com>
Signed-off-by: Oscar Salvador <osalvador@...e.de>
---
 include/linux/mm.h  |  7 +++----
 mm/memory-failure.c | 14 +++-----------
 2 files changed, 6 insertions(+), 15 deletions(-)

diff --git v5.8-rc7-mmotm-2020-07-27-18-18/include/linux/mm.h v5.8-rc7-mmotm-2020-07-27-18-18_patched/include/linux/mm.h
index 371970dfffc4..c09111e8eac8 100644
--- v5.8-rc7-mmotm-2020-07-27-18-18/include/linux/mm.h
+++ v5.8-rc7-mmotm-2020-07-27-18-18_patched/include/linux/mm.h
@@ -2976,10 +2976,9 @@ void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
 				  unsigned long nr_pages);
 
 enum mf_flags {
-	MF_COUNT_INCREASED = 1 << 0,
-	MF_ACTION_REQUIRED = 1 << 1,
-	MF_MUST_KILL = 1 << 2,
-	MF_SOFT_OFFLINE = 1 << 3,
+	MF_ACTION_REQUIRED = 1 << 0,
+	MF_MUST_KILL = 1 << 1,
+	MF_SOFT_OFFLINE = 1 << 2,
 };
 extern int memory_failure(unsigned long pfn, int flags);
 extern void memory_failure_queue(unsigned long pfn, int flags);
diff --git v5.8-rc7-mmotm-2020-07-27-18-18/mm/memory-failure.c v5.8-rc7-mmotm-2020-07-27-18-18_patched/mm/memory-failure.c
index 6853bf3a253d..9768ab5f51ef 100644
--- v5.8-rc7-mmotm-2020-07-27-18-18/mm/memory-failure.c
+++ v5.8-rc7-mmotm-2020-07-27-18-18_patched/mm/memory-failure.c
@@ -1118,7 +1118,7 @@ static int memory_failure_hugetlb(unsigned long pfn, int flags)
 
 	num_poisoned_pages_inc();
 
-	if (!(flags & MF_COUNT_INCREASED) && !get_hwpoison_page(p)) {
+	if (!get_hwpoison_page(p)) {
 		/*
 		 * Check "filter hit" and "race with other subpage."
 		 */
@@ -1314,7 +1314,7 @@ int memory_failure(unsigned long pfn, int flags)
 	 * In fact it's dangerous to directly bump up page count from 0,
 	 * that may make page_ref_freeze()/page_ref_unfreeze() mismatch.
 	 */
-	if (!(flags & MF_COUNT_INCREASED) && !get_hwpoison_page(p)) {
+	if (!get_hwpoison_page(p)) {
 		if (is_free_buddy_page(p)) {
 			action_result(pfn, MF_MSG_BUDDY, MF_DELAYED);
 			return 0;
@@ -1354,10 +1354,7 @@ int memory_failure(unsigned long pfn, int flags)
 	shake_page(p, 0);
 	/* shake_page could have turned it free. */
 	if (!PageLRU(p) && is_free_buddy_page(p)) {
-		if (flags & MF_COUNT_INCREASED)
-			action_result(pfn, MF_MSG_BUDDY, MF_DELAYED);
-		else
-			action_result(pfn, MF_MSG_BUDDY_2ND, MF_DELAYED);
+		action_result(pfn, MF_MSG_BUDDY_2ND, MF_DELAYED);
 		return 0;
 	}
 
@@ -1648,9 +1645,6 @@ static int __get_any_page(struct page *p, unsigned long pfn, int flags)
 {
 	int ret;
 
-	if (flags & MF_COUNT_INCREASED)
-		return 1;
-
 	/*
 	 * When the target page is a free hugepage, just remove it
 	 * from free hugepage list.
@@ -1930,8 +1924,6 @@ int soft_offline_page(unsigned long pfn, int flags)
 
 	if (PageHWPoison(page)) {
 		pr_info("soft offline: %#lx page already poisoned\n", pfn);
-		if (flags & MF_COUNT_INCREASED)
-			put_page(page);
 		return -EBUSY;
 	}
 
-- 
2.17.1