+ bootmem-remove-the-vmemmap-pages-from-kmemleak-in-free_bootmem_page.patch added to mm-hotfixes-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: bootmem: remove the vmemmap pages from kmemleak in free_bootmem_page
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     bootmem-remove-the-vmemmap-pages-from-kmemleak-in-free_bootmem_page.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/bootmem-remove-the-vmemmap-pages-from-kmemleak-in-free_bootmem_page.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Liu Shixin <liushixin2@huawei.com>
Subject: bootmem: remove the vmemmap pages from kmemleak in free_bootmem_page
Date: Thu, 18 Aug 2022 21:21:04 +0800

The vmemmap pages is marked by kmemleak when allocated from memblock. 
Remove it from kmemleak when free the page.  Otherwise, when we reuse the
page, kmemleak may report such an error and then stop working.

 kmemleak: Cannot insert 0xffff98fb6eab3d40 into the object search tree (overlaps existing)
 kmemleak: Kernel memory leak detector disabled
 kmemleak: Object 0xffff98fb6be00000 (size 335544320):
 kmemleak:   comm "swapper", pid 0, jiffies 4294892296
 kmemleak:   min_count = 0
 kmemleak:   count = 0
 kmemleak:   flags = 0x1
 kmemleak:   checksum = 0
 kmemleak:   backtrace:

Link: https://lkml.kernel.org/r/20220818132104.2144770-1-liushixin2@huawei.com
Fixes: f41f2ed43ca5 ("mm: hugetlb: free the vmemmap pages associated with each HugeTLB page")
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/bootmem_info.h |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/include/linux/bootmem_info.h~bootmem-remove-the-vmemmap-pages-from-kmemleak-in-free_bootmem_page
+++ a/include/linux/bootmem_info.h
@@ -3,6 +3,7 @@
 #define __LINUX_BOOTMEM_INFO_H
 
 #include <linux/mm.h>
+#include <linux/kmemleak.h>
 
 /*
  * Types for free bootmem stored in page->lru.next. These have to be in
@@ -38,9 +39,10 @@ static inline void free_bootmem_page(str
 	 */
 	VM_BUG_ON_PAGE(page_ref_count(page) != 2, page);
 
-	if (magic == SECTION_INFO || magic == MIX_SECTION_INFO)
+	if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
+		kmemleak_free_part(page_to_virt(page), PAGE_SIZE);
 		put_page_bootmem(page);
-	else
+	} else
 		VM_BUG_ON_PAGE(1, page);
 }
 #else
_

Patches currently in -mm which might be from liushixin2@huawei.com are

bootmem-remove-the-vmemmap-pages-from-kmemleak-in-free_bootmem_page.patch