[6.1-stable PATCH 2/2] mm, hwpoison: when copy-on-write hits poison, take page offline

[Jane Chu <jane.chu@oracle.com>]

From: Tony Luck <tony.luck@intel.com>

commit d302c2398ba269e788a4f37ae57c07a7fcabaa42 upstream.

Cannot call memory_failure() directly from the fault handler because
mmap_lock (and others) are held.

It is important, but not urgent, to mark the source page as h/w poisoned
and unmap it from other tasks.

Use memory_failure_queue() to request a call to memory_failure() for the
page with the error.

Also provide a stub version for CONFIG_MEMORY_FAILURE=n

Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20221021200120.175753-3-tony.luck@intel.com
Signed-off-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Shuai Xue <xueshuai@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jane Chu <jane.chu@oracle.com>

Conflicts:
	include/linux/mm.h
Due to missing commits
  e591ef7d96d6e ("mm,hwpoison,hugetlb,memory_hotplug: hotremove memory section with hwpoisoned hugepage")
  5033091de814a ("mm/hwpoison: introduce per-memory_block hwpoison counter")
The impact of e591ef7d96d6e is its introduction of an additional flag in
__get_huge_page_for_hwpoison() that serves as an indication a hwpoisoned
hugetlb page should have its migratable bit cleared.
The impact of 5033091de814a is contexual.
Resolve by ignoring both missing commits.

Signed-off-by: Jane Chu <jane.chu@oracle.com>
---
 include/linux/mm.h | 5 ++++-
 mm/memory.c        | 4 +++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index e5e8acf8eb89..49e14d3afd44 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3295,7 +3295,6 @@ enum mf_flags {
 int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index,
 		      unsigned long count, int mf_flags);
 extern int memory_failure(unsigned long pfn, int flags);
-extern void memory_failure_queue(unsigned long pfn, int flags);
 extern void memory_failure_queue_kick(int cpu);
 extern int unpoison_memory(unsigned long pfn);
 extern int sysctl_memory_failure_early_kill;
@@ -3304,8 +3303,12 @@ extern void shake_page(struct page *p);
 extern atomic_long_t num_poisoned_pages __read_mostly;
 extern int soft_offline_page(unsigned long pfn, int flags);
 #ifdef CONFIG_MEMORY_FAILURE
+extern void memory_failure_queue(unsigned long pfn, int flags);
 extern int __get_huge_page_for_hwpoison(unsigned long pfn, int flags);
 #else
+static inline void memory_failure_queue(unsigned long pfn, int flags)
+{
+}
 static inline int __get_huge_page_for_hwpoison(unsigned long pfn, int flags)
 {
 	return 0;
diff --git a/mm/memory.c b/mm/memory.c
index bd8b04dcc851..bc8b2bd295cb 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2861,8 +2861,10 @@ static inline int __wp_page_copy_user(struct page *dst, struct page *src,
 	unsigned long addr = vmf->address;
 
 	if (likely(src)) {
-		if (copy_mc_user_highpage(dst, src, addr, vma))
+		if (copy_mc_user_highpage(dst, src, addr, vma)) {
+			memory_failure_queue(page_to_pfn(src), 0);
 			return -EHWPOISON;
+		}
 		return 0;
 	}
 
-- 
2.18.4