Commit 93b343ab authored Nov 30, 2019 by Wei Yang Committed by Linus Torvalds Dec 01, 2019

mm/mmap.c: prev could be retrieved from vma->vm_prev

Currently __vma_unlink_common handles two cases:

  * has_prev
  * or not

When has_prev is false, it is obvious prev is calculated from
vma->vm_prev in __vma_unlink_common.

When has_prev is true, the prev is passed through from __vma_unlink_prev
in __vma_adjust for non-case 8.  And at the beginning next is calculated
from vma->vm_next, which implies vma is next->vm_prev.

The above statement sounds a little complicated, while to think in
another point of view, no matter whether vma and next is swapped, the
mmap link list still preserves its property.  It is proper to access
vma->vm_prev.

Link: http://lkml.kernel.org/r/20191006012636.31521-1-richardw.yang@linux.intel.com


Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent eef1a429

mm/mmap.c

+7 −13

Original line number	Diff line number	Diff line
		@@ -684,23 +684,17 @@ static void __insert_vm_struct(struct mm_struct mm, struct vm_area_struct vma)

		static __always_inline void __vma_unlink_common(struct mm_struct *mm,
		struct vm_area_struct *vma,
		struct vm_area_struct *prev,
		bool has_prev,
		struct vm_area_struct *ignore)
		{
		struct vm_area_struct *next;
		struct vm_area_struct prev, next;

		vma_rb_erase_ignore(vma, &mm->mm_rb, ignore);
		next = vma->vm_next;
		if (has_prev)
		prev->vm_next = next;
		else {
		prev = vma->vm_prev;
		if (prev)
		prev->vm_next = next;
		else
		mm->mmap = next;
		}
		if (next)
		next->vm_prev = prev;

		@@ -712,7 +706,7 @@ static inline void __vma_unlink_prev(struct mm_struct *mm,
		struct vm_area_struct *vma,
		struct vm_area_struct *prev)
		{
		__vma_unlink_common(mm, vma, prev, true, vma);
		__vma_unlink_common(mm, vma, vma);
		}

		/*
		@@ -898,7 +892,7 @@ again:
		* "next" (which is stored in post-swap()
		* "vma").
		*/
		__vma_unlink_common(mm, next, NULL, false, vma);
		__vma_unlink_common(mm, next, vma);
		if (file)
		__remove_shared_vm_struct(next, file, mapping);
		} else if (insert) {

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