mm, madvise_inject_error: Disable MADV_SOFT_OFFLINE for ZONE_DEVICE p…

…ages 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 <[email protected]> Signed-off-by: Dan Williams <[email protected]> Acked-by: Naoya Horiguchi <[email protected]> Signed-off-by: Dave Jiang <[email protected]>
soumdtt · Jul 20, 2018 · 86a6681 · 86a6681
1 parent 73449da
commit 86a6681
Showing 1 changed file with 8 additions and 0 deletions.
diff --git 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)