summaryrefslogtreecommitdiff
path: root/mm
diff options
context:
space:
mode:
Diffstat (limited to 'mm')
-rw-r--r--mm/huge_memory.c10
-rw-r--r--mm/swapfile.c15
2 files changed, 24 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 02dfe635c9fe..772048c233d1 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2481,6 +2481,9 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(!PageCompound(page), page);
+ if (PageWriteback(page))
+ return -EBUSY;
+
if (PageAnon(head)) {
/*
* The caller does not necessarily hold an mmap_sem that would
@@ -2558,7 +2561,12 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
__dec_node_page_state(page, NR_SHMEM_THPS);
spin_unlock(&pgdata->split_queue_lock);
__split_huge_page(page, list, flags);
- ret = 0;
+ if (PageSwapCache(head)) {
+ swp_entry_t entry = { .val = page_private(head) };
+
+ ret = split_swap_cluster(entry);
+ } else
+ ret = 0;
} else {
if (IS_ENABLED(CONFIG_DEBUG_VM) && mapcount) {
pr_alert("total_mapcount: %u, page_count(): %u\n",
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 267b1fe41844..42eff9e4e972 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1216,6 +1216,21 @@ static void swapcache_free_cluster(swp_entry_t entry)
}
}
}
+
+int split_swap_cluster(swp_entry_t entry)
+{
+ struct swap_info_struct *si;
+ struct swap_cluster_info *ci;
+ unsigned long offset = swp_offset(entry);
+
+ si = _swap_info_get(entry);
+ if (!si)
+ return -EBUSY;
+ ci = lock_cluster(si, offset);
+ cluster_clear_huge(ci);
+ unlock_cluster(ci);
+ return 0;
+}
#else
static inline void swapcache_free_cluster(swp_entry_t entry)
{