[PATCH v6 05/13] mm, madvise_inject_error: Disable MADV_SOFT_OFFLINE for ZONE_DEVICE pages
From: Dan Williams <hidden>
Date: 2018-07-14 04:49:56
Also in:
linux-fsdevel, lkml, nvdimm
Subsystem:
hwpoison memory failure handling, memory management, the rest · Maintainers:
Miaohe Lin, Andrew Morton, Linus Torvalds
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 <redacted> Signed-off-by: Dan Williams <redacted> --- 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)