linux-kernel - [PATCH v3 01/15] mm,hwpoison: cleanup unused PageHuge() check

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Date:   Wed, 24 Jun 2020 15:01:23 +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, naoya.horiguchi@....com,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 01/15] mm,hwpoison: cleanup unused PageHuge() check

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

Drop the PageHuge check, which is dead code since memory_failure() forks
into memory_failure_hugetlb() for hugetlb pages.

memory_failure() and memory_failure_hugetlb() shares some functions like
hwpoison_user_mappings() and identify_page_state(), so they should properly
handle 4kB page, thp, and hugetlb.

Signed-off-by: Naoya Horiguchi <naoya.horiguchi@....com>
Signed-off-by: Oscar Salvador <osalvador@...e.de>
---
changelog v2 -> v3:
- add description about shared logic b/w hugetlb and non-hugetlb path.
---
 mm/memory-failure.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git v5.8-rc1-mmots-2020-06-20-21-44/mm/memory-failure.c v5.8-rc1-mmots-2020-06-20-21-44_patched/mm/memory-failure.c
index 47b8ccb1fb9b..e5d0c14c2332 100644
--- v5.8-rc1-mmots-2020-06-20-21-44/mm/memory-failure.c
+++ v5.8-rc1-mmots-2020-06-20-21-44_patched/mm/memory-failure.c
@@ -1382,10 +1382,7 @@ int memory_failure(unsigned long pfn, int flags)
 	 * page_remove_rmap() in try_to_unmap_one(). So to determine page status
 	 * correctly, we save a copy of the page flags at this time.
 	 */
-	if (PageHuge(p))
-		page_flags = hpage->flags;
-	else
-		page_flags = p->flags;
+	page_flags = p->flags;
 
 	/*
 	 * unpoison always clear PG_hwpoison inside page lock
-- 
2.17.1