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Subject[PATCHv3 1/3] mm: Introduce vma_init()
Date
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.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
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;
}

--
2.18.0
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