[merged mm-stable] mm-mmapc-fix-missing-call-to-vm_unacct_memory-in-mmap_region.patch removed from -mm tree

[merged mm-stable] mm-mmapc-fix-missing-call-to-vm_unacct_memory-in-mmap_region.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/mmap.c: fix missing call to vm_unacct_memory in mmap_region
has been removed from the -mm tree.  Its filename was
     mm-mmapc-fix-missing-call-to-vm_unacct_memory-in-mmap_region.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Miaohe Lin <linmiaohe@huawei.com>
Subject: mm/mmap.c: fix missing call to vm_unacct_memory in mmap_region
Date: Sat, 18 Jun 2022 16:20:27 +0800

Since the beginning, charged is set to 0 to avoid calling vm_unacct_memory
twice because vm_unacct_memory will be called by above unmap_region.  But
since commit 4f74d2c8e827 ("vm: remove 'nr_accounted' calculations from
the unmap_vmas() interfaces"), unmap_region doesn't call vm_unacct_memory
anymore.  So charged shouldn't be set to 0 now otherwise the calling to
paired vm_unacct_memory will be missed and leads to imbalanced account.

Link: https://lkml.kernel.org/r/20220618082027.43391-1-linmiaohe@huawei.com
Fixes: 4f74d2c8e827 ("vm: remove 'nr_accounted' calculations from the unmap_vmas() interfaces")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mmap.c |    1 -
 1 file changed, 1 deletion(-)

--- a/mm/mmap.c~mm-mmapc-fix-missing-call-to-vm_unacct_memory-in-mmap_region
+++ a/mm/mmap.c
@@ -1847,7 +1847,6 @@ unmap_and_free_vma:
 
 	/* Undo any partial mapping done by a device driver. */
 	unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end);
-	charged = 0;
 	if (vm_flags & VM_SHARED)
 		mapping_unmap_writable(file->f_mapping);
 free_vma:
_

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

mm-hugetlb-avoid-corrupting-page-mapping-in-hugetlb_mcopy_atomic_pte.patch
mm-page_alloc-minor-clean-up-for-memmap_init_compound.patch