[PATCH v4 1/6] mm: move memory_failure_queue() into copy_mc_[user]_highpage()

[Kefeng Wang <wangkefeng.wang@huawei.com>]

There is a memory_failure_queue() call after copy_mc_[user]_highpage(),
see callers, eg, CoW/KSM page copy, it is used to mark the source page
as h/w poisoned and unmap it from other tasks, and the upcomming poison
recover from migrate folio will do the similar thing, so let's move the
memory_failure_queue() into the copy_mc_[user]_highpage() instead of
adding it into each user, this should also enhance the handling of
poisoned page in khugepaged.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 include/linux/highmem.h |  6 ++++++
 mm/ksm.c                |  1 -
 mm/memory.c             | 12 +++---------
 3 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 00341b56d291..6b0d6f3c8580 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -352,6 +352,9 @@ static inline int copy_mc_user_highpage(struct page *to, struct page *from,
 	kunmap_local(vto);
 	kunmap_local(vfrom);
 
+	if (ret)
+		memory_failure_queue(page_to_pfn(from), 0);
+
 	return ret;
 }
 
@@ -368,6 +371,9 @@ static inline int copy_mc_highpage(struct page *to, struct page *from)
 	kunmap_local(vto);
 	kunmap_local(vfrom);
 
+	if (ret)
+		memory_failure_queue(page_to_pfn(from), 0);
+
 	return ret;
 }
 #else
diff --git a/mm/ksm.c b/mm/ksm.c
index 452ac8346e6e..3d95e5a9f301 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -3091,7 +3091,6 @@ struct folio *ksm_might_need_to_copy(struct folio *folio,
 		if (copy_mc_user_highpage(folio_page(new_folio, 0), page,
 								addr, vma)) {
 			folio_put(new_folio);
-			memory_failure_queue(folio_pfn(folio), 0);
 			return ERR_PTR(-EHWPOISON);
 		}
 		folio_set_dirty(new_folio);
diff --git a/mm/memory.c b/mm/memory.c
index 63f9f98b47bd..e06de844eaba 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3034,10 +3034,8 @@ 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)) {
-			memory_failure_queue(page_to_pfn(src), 0);
+		if (copy_mc_user_highpage(dst, src, addr, vma))
 			return -EHWPOISON;
-		}
 		return 0;
 	}
 
@@ -6417,10 +6415,8 @@ static int copy_user_gigantic_page(struct folio *dst, struct folio *src,
 
 		cond_resched();
 		if (copy_mc_user_highpage(dst_page, src_page,
-					  addr + i*PAGE_SIZE, vma)) {
-			memory_failure_queue(page_to_pfn(src_page), 0);
+					  addr + i*PAGE_SIZE, vma))
 			return -EHWPOISON;
-		}
 	}
 	return 0;
 }
@@ -6437,10 +6433,8 @@ static int copy_subpage(unsigned long addr, int idx, void *arg)
 	struct page *dst = nth_page(copy_arg->dst, idx);
 	struct page *src = nth_page(copy_arg->src, idx);
 
-	if (copy_mc_user_highpage(dst, src, addr, copy_arg->vma)) {
-		memory_failure_queue(page_to_pfn(src), 0);
+	if (copy_mc_user_highpage(dst, src, addr, copy_arg->vma))
 		return -EHWPOISON;
-	}
 	return 0;
 }
 
-- 
2.27.0