linux-kernel - [PATCH 2/4] mm,hwpoison: Refactor madvise_inject

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Date:   Wed,  2 Sep 2020 11:45:08 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     akpm@...ux-foundation.org
Cc:     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 2/4] mm,hwpoison: Refactor madvise_inject_error

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

Signed-off-by: Oscar Salvador <osalvador@...e.com>
---
 mm/madvise.c | 30 +++++++++++++-----------------
 1 file changed, 13 insertions(+), 17 deletions(-)

diff --git a/mm/madvise.c b/mm/madvise.c
index e32e7efbba0f..e92e06890b08 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -885,7 +885,6 @@ 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;
 
@@ -895,6 +894,7 @@ 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);
@@ -911,25 +911,21 @@ 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