From 86a66810baa87e5d1c93a51f71d36c7f71fe3113 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Fri, 13 Jul 2018 21:49:56 -0700
Subject: [PATCH] mm, madvise_inject_error: Disable MADV_SOFT_OFFLINE for
ZONE_DEVICE pages
Git-commit: 86a66810baa87e5d1c93a51f71d36c7f71fe3113
Patch-mainline: v4.19-rc1
References: bsc#1107783
Given that dax / device-mapped pages are never subject to page
allocations remove them from consideration by the soft-offline
mechanism.
Reported-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Jan Kara <jack@suse.cz>
---
mm/memory-failure.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 9d142b9b86dc..988f977db3d2 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1751,6 +1751,14 @@ int soft_offline_page(struct page *page, int flags)
int ret;
unsigned long pfn = page_to_pfn(page);
+ if (is_zone_device_page(page)) {
+ pr_debug_ratelimited("soft_offline: %#lx page is device page\n",
+ pfn);
+ if (flags & MF_COUNT_INCREASED)
+ put_page(page);
+ return -EIO;
+ }
+
if (PageHWPoison(page)) {
pr_info("soft offline: %#lx page already poisoned\n", pfn);
if (flags & MF_COUNT_INCREASED)
--
2.16.4