linux-kernel - [PATCH v3 04/15] mm,madvise: Refactor madvise_inject

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Date:   Wed, 24 Jun 2020 15:01:26 +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 04/15] mm,madvise: Refactor madvise_inject_error

From: Oscar Salvador <osalvador@...e.de>

Make a proper if-else condition for {hard,soft}-offline.

Signed-off-by: Oscar Salvador <osalvador@...e.de>
Signed-off-by: Naoya Horiguchi <naoya.horiguchi@....com>
---
 mm/madvise.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git v5.8-rc1-mmots-2020-06-20-21-44/mm/madvise.c v5.8-rc1-mmots-2020-06-20-21-44_patched/mm/madvise.c
index 275b08edd428..bee1f4ac70d6 100644
--- v5.8-rc1-mmots-2020-06-20-21-44/mm/madvise.c
+++ v5.8-rc1-mmots-2020-06-20-21-44_patched/mm/madvise.c
@@ -869,16 +869,15 @@ static long madvise_remove(struct vm_area_struct *vma,
 static int madvise_inject_error(int behavior,
 		unsigned long start, unsigned long end)
 {
-	struct page *page;
 	struct zone *zone;
 	unsigned long size;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-
 	for (; start < end; start += size) {
 		unsigned long pfn;
+		struct page *page;
 		int ret;
 
 		ret = get_user_pages_fast(start, 1, 0, &page);
@@ -908,17 +907,14 @@ static int madvise_inject_error(int behavior,
 
 		if (behavior == MADV_SOFT_OFFLINE) {
 			pr_info("Soft offlining pfn %#lx at process virtual address %#lx\n",
-					pfn, start);
-
+				pfn, start);
 			ret = soft_offline_page(pfn, 0);
-			if (ret)
-				return ret;
-			continue;
+		} else {
+			pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n",
+				pfn, start);
+			ret = memory_failure(pfn, 0);
 		}
 
-		pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n",
-				pfn, start);
-		ret = memory_failure(pfn, 0);
 		if (ret)
 			return ret;
 	}
-- 
2.17.1