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Subject[PATCH v6 05/13] mm, madvise_inject_error: Disable MADV_SOFT_OFFLINE for ZONE_DEVICE pages
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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>
---
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)
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