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mm: replace vma->sharead.linear with vma->shared

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After removing vma->shared.nonlinear we have only one member of
vma->shared union, which doesn't make much sense.

This patch drops the union and move struct vma->shared.linear to
vma->shared.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2015-02-10 14:10:02 -08:00 committed by Linus Torvalds
parent 27ba0644ea
commit ac51b934f3
2 changed files with 20 additions and 22 deletions
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8
include/linux/mm_types.h
View File

@ -275,11 +275,9 @@ struct vm_area_struct {
* For areas with an address space and backing store,
* linkage into the address_space->i_mmap interval tree.
*/
union {
struct {
struct rb_node rb;
unsigned long rb_subtree_last;
} linear;
struct {
struct rb_node rb;
unsigned long rb_subtree_last;
} shared;
/*

34
mm/interval_tree.c
View File

@ -21,8 +21,8 @@ static inline unsigned long vma_last_pgoff(struct vm_area_struct *v)
return v->vm_pgoff + ((v->vm_end - v->vm_start) >> PAGE_SHIFT) - 1;
}
INTERVAL_TREE_DEFINE(struct vm_area_struct, shared.linear.rb,
unsigned long, shared.linear.rb_subtree_last,
INTERVAL_TREE_DEFINE(struct vm_area_struct, shared.rb,
unsigned long, shared.rb_subtree_last,
vma_start_pgoff, vma_last_pgoff,, vma_interval_tree)
/* Insert node immediately after prev in the interval tree */
@ -36,26 +36,26 @@ void vma_interval_tree_insert_after(struct vm_area_struct *node,
VM_BUG_ON_VMA(vma_start_pgoff(node) != vma_start_pgoff(prev), node);
if (!prev->shared.linear.rb.rb_right) {
if (!prev->shared.rb.rb_right) {
parent = prev;
link = &prev->shared.linear.rb.rb_right;
link = &prev->shared.rb.rb_right;
} else {
parent = rb_entry(prev->shared.linear.rb.rb_right,
struct vm_area_struct, shared.linear.rb);
if (parent->shared.linear.rb_subtree_last < last)
parent->shared.linear.rb_subtree_last = last;
while (parent->shared.linear.rb.rb_left) {
parent = rb_entry(parent->shared.linear.rb.rb_left,
struct vm_area_struct, shared.linear.rb);
if (parent->shared.linear.rb_subtree_last < last)
parent->shared.linear.rb_subtree_last = last;
parent = rb_entry(prev->shared.rb.rb_right,
struct vm_area_struct, shared.rb);
if (parent->shared.rb_subtree_last < last)
parent->shared.rb_subtree_last = last;
while (parent->shared.rb.rb_left) {
parent = rb_entry(parent->shared.rb.rb_left,
struct vm_area_struct, shared.rb);
if (parent->shared.rb_subtree_last < last)
parent->shared.rb_subtree_last = last;
}
link = &parent->shared.linear.rb.rb_left;
link = &parent->shared.rb.rb_left;
}
node->shared.linear.rb_subtree_last = last;
rb_link_node(&node->shared.linear.rb, &parent->shared.linear.rb, link);
rb_insert_augmented(&node->shared.linear.rb, root,
node->shared.rb_subtree_last = last;
rb_link_node(&node->shared.rb, &parent->shared.rb, link);
rb_insert_augmented(&node->shared.rb, root,
&vma_interval_tree_augment);
}