FAILED: patch "[PATCH] mm, page_owner: handle THP splits correctly" failed to apply to 4.19-stable tree

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f7da677bc6e72033f0981b9d58b5c5d409fa641e Mon Sep 17 00:00:00 2001
From: Vlastimil Babka <[email protected]>
Date: Sat, 24 Aug 2019 17:54:59 -0700
Subject: [PATCH] mm, page_owner: handle THP splits correctly

THP splitting path is missing the split_page_owner() call that split_page() has.

As a result, split THP pages are wrongly reported in the page_owner file as order-9 pages. Furthermore when the former head page is freed, the remaining former tail pages are not listed in the page_owner file at all. This patch fixes that by adding the split_page_owner() call into __split_huge_page().

index 738065f765ab..de1f15969e27 100644
@@ -32,6 +32,7 @@
 #include <linux/shmem_fs.h>
 #include <linux/oom.h>
 #include <linux/numa.h>
+#include <linux/page_owner.h>
 
 #include <asm/tlb.h>
 #include <asm/pgalloc.h>

@@ -2516,6 +2517,9 @@ static void __split_huge_page(struct page *page, struct list_head *list,
 	}
 
 	ClearPageCompound(head);
+
+	split_page_owner(head, HPAGE_PMD_ORDER);
+
 	/* See comment in __split_huge_page_tail() */
 	if (PageAnon(head)) {
 		/* Additional pin to swap cache */

Nevermind about these 3 rejections, I've fixed them up.

thanks,

greg k-h