Commit 027232da authored Jul 26, 2018 by Kirill A. Shutemov Committed by Linus Torvalds Jul 26, 2018

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>

parent 31c5bda3

include/linux/mm.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -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;

kernel/fork.c

+2 −4

Original line number	Diff line number	Diff line
		@@ -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;
		}

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