The quilt patch titled Subject: nommu: fix split_vma() map_count error has been removed from the -mm tree. Its filename was nommu-fix-split_vma-map_count-error.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------ From: Liam Howlett liam.howlett@oracle.com Subject: nommu: fix split_vma() map_count error Date: Mon, 9 Jan 2023 20:58:20 +0000
During the maple tree conversion of nommu, an error in counting the VMAs was introduced by counting the existing VMA again. The counting used to be decremented by one and incremented by two, but now it only increments by two. Fix the counting error by moving the increment outside the setup_vma_to_mm() function to the callers.
Link: https://lkml.kernel.org/r/20230109205809.956325-1-Liam.Howlett@oracle.com Fixes: 8220543df148 ("nommu: remove uses of VMA linked list") Signed-off-by: Liam R. Howlett Liam.Howlett@oracle.com Cc: Matthew Wilcox (Oracle) willy@infradead.org Cc: Vlastimil Babka vbabka@suse.cz Cc: Yu Zhao yuzhao@google.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
mm/nommu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/mm/nommu.c~nommu-fix-split_vma-map_count-error +++ a/mm/nommu.c @@ -559,7 +559,6 @@ void vma_mas_remove(struct vm_area_struc
static void setup_vma_to_mm(struct vm_area_struct *vma, struct mm_struct *mm) { - mm->map_count++; vma->vm_mm = mm;
/* add the VMA to the mapping */ @@ -587,6 +586,7 @@ static void mas_add_vma_to_mm(struct ma_ BUG_ON(!vma->vm_region);
setup_vma_to_mm(vma, mm); + mm->map_count++;
/* add the VMA to the tree */ vma_mas_store(vma, mas); @@ -1347,6 +1347,7 @@ int split_vma(struct mm_struct *mm, stru if (vma->vm_file) return -ENOMEM;
+ mm = vma->vm_mm; if (mm->map_count >= sysctl_max_map_count) return -ENOMEM;
@@ -1398,6 +1399,7 @@ int split_vma(struct mm_struct *mm, stru mas_set_range(&mas, vma->vm_start, vma->vm_end - 1); mas_store(&mas, vma); vma_mas_store(new, &mas); + mm->map_count++; return 0;
err_mas_preallocate: _
Patches currently in -mm which might be from liam.howlett@oracle.com are
maple_tree-fix-mas_empty_area_rev-lower-bound-validation.patch maple_tree-remove-gfp_zero-from-kmem_cache_alloc-and-kmem_cache_alloc_bulk.patch