[patch 030/158] mm/mmap.c: prev could be retrieved from vma->vm_prev

[akpm@linux-foundation.org]

From: Wei Yang <richardw.yang@linux.intel.com>
Subject: 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>
---

 mm/mmap.c |   20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

--- a/mm/mmap.c~mm-mmapc-prev-could-be-retrieved-from-vma-vm_prev
+++ a/mm/mmap.c
@@ -684,23 +684,17 @@ static void __insert_vm_struct(struct mm
 
 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 = vma->vm_prev;
+	if (prev)
 		prev->vm_next = next;
-	else {
-		prev = vma->vm_prev;
-		if (prev)
-			prev->vm_next = next;
-		else
-			mm->mmap = next;
-	}
+	else
+		mm->mmap = next;
 	if (next)
 		next->vm_prev = prev;
 
@@ -712,7 +706,7 @@ static inline void __vma_unlink_prev(str
 				     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) {
_