From 027232da7c7c1c7f04383f93bd798e475dde5285 Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Date: Thu, 26 Jul 2018 16:37:25 -0700
Subject: [PATCH] mm: introduce vma_init()
Not all VMAs allocated with vm_area_alloc(). Some of them allocated on
stack or in data segment.
The new helper can be use to initialize VMA properly regardless where it
was allocated.
Link: http://lkml.kernel.org/r/20180724121139.62570-2-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
include/linux/mm.h | 6 ++++++
kernel/fork.c | 6 ++----
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index d3a3842316b8..31540f166987 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -452,6 +452,12 @@ struct vm_operations_struct {
unsigned long addr);
};
+static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm)
+{
+ vma->vm_mm = mm;
+ INIT_LIST_HEAD(&vma->anon_vma_chain);
+}
+
struct mmu_gather;
struct inode;
diff --git a/kernel/fork.c b/kernel/fork.c
index a191c05e757d..1b27babc4c78 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -312,10 +312,8 @@ struct vm_area_struct *vm_area_alloc(struct mm_struct *mm)
{
struct vm_area_struct *vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
- if (vma) {
- vma->vm_mm = mm;
- INIT_LIST_HEAD(&vma->anon_vma_chain);
- }
+ if (vma)
+ vma_init(vma, mm);
return vma;
}