linux-kernel - [PATCH v4 4/7] mm,hwpoison: refactor madvise_inject

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Message-Id: <20200917081049.27428-5-osalvador@suse.de>
Date:   Thu, 17 Sep 2020 10:10:46 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     akpm@...ux-foundation.org
Cc:     aris@...vo.org, naoya.horiguchi@....com, mhocko@...nel.org,
        tony.luck@...el.com, cai@....pw, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Oscar Salvador <osalvador@...e.de>,
        Oscar Salvador <osalvador@...e.com>
Subject: [PATCH v4 4/7] mm,hwpoison: refactor madvise_inject_error

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

[akpm: remove zone variable and refactor comment]
Signed-off-by: Oscar Salvador <osalvador@...e.com>
---
 mm/madvise.c | 32 ++++++++++++++------------------
 1 file changed, 14 insertions(+), 18 deletions(-)

diff --git a/mm/madvise.c b/mm/madvise.c
index 4d87b31a1576..4a48f7215195 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -869,8 +869,6 @@ 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))
@@ -879,6 +877,7 @@ static int madvise_inject_error(int behavior,
 
 	for (; start < end; start += size) {
 		unsigned long pfn;
+		struct page *page;
 		int ret;
 
 		ret = get_user_pages_fast(start, 1, 0, &page);
@@ -895,25 +894,22 @@ 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, MF_COUNT_INCREASED);
-			if (ret)
-				return ret;
-			continue;
+		} else {
+			pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n",
+				 pfn, start);
+			/*
+			 * Drop the page reference taken by
+			 * get_user_pages_fast(). In the absence of
+			 * MF_COUNT_INCREASED the memory_failure() routine is
+			 * responsible for pinning the page to prevent it
+			 * from being released back to the page allocator.
+			 */
+			put_page(page);
+			ret = memory_failure(pfn, 0);
 		}
 
-		pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n",
-				pfn, start);
-
-		/*
-		 * Drop the page reference taken by get_user_pages_fast(). In
-		 * the absence of MF_COUNT_INCREASED the memory_failure()
-		 * routine is responsible for pinning the page to prevent it
-		 * from being released back to the page allocator.
-		 */
-		put_page(page);
-		ret = memory_failure(pfn, 0);
 		if (ret)
 			return ret;
 	}
-- 
2.26.2