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rmap: drop support of non-linear mappings

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We don't create non-linear mappings anymore.  Let's drop code which
handles them in rmap.

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 14:09:59 -08:00
committed by Linus Torvalds
父節點 1da4b35b00
當前提交 27ba0644ea
共有 11 個文件被更改，包括 18 次插入 和 300 次删除
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24
mm/mmap.c
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@@ -243,10 +243,7 @@ static void __remove_shared_vm_struct(struct vm_area_struct *vma,
mapping_unmap_writable(mapping);
flush_dcache_mmap_lock(mapping);
if (unlikely(vma->vm_flags & VM_NONLINEAR))
list_del_init(&vma->shared.nonlinear);
else
vma_interval_tree_remove(vma, &mapping->i_mmap);
vma_interval_tree_remove(vma, &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
}
@@ -649,10 +646,7 @@ static void __vma_link_file(struct vm_area_struct *vma)
atomic_inc(&mapping->i_mmap_writable);
flush_dcache_mmap_lock(mapping);
if (unlikely(vma->vm_flags & VM_NONLINEAR))
vma_nonlinear_insert(vma, &mapping->i_mmap_nonlinear);
else
vma_interval_tree_insert(vma, &mapping->i_mmap);
vma_interval_tree_insert(vma, &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
}
}
@@ -789,14 +783,11 @@ again: remove_next = 1 + (end > next->vm_end);
if (file) {
mapping = file->f_mapping;
if (!(vma->vm_flags & VM_NONLINEAR)) {
root = &mapping->i_mmap;
uprobe_munmap(vma, vma->vm_start, vma->vm_end);
root = &mapping->i_mmap;
uprobe_munmap(vma, vma->vm_start, vma->vm_end);
if (adjust_next)
uprobe_munmap(next, next->vm_start,
next->vm_end);
}
if (adjust_next)
uprobe_munmap(next, next->vm_start, next->vm_end);
i_mmap_lock_write(mapping);
if (insert) {
@@ -3177,8 +3168,7 @@ static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping)
*
* mmap_sem in write mode is required in order to block all operations
* that could modify pagetables and free pages without need of
* altering the vma layout (for example populate_range() with
* nonlinear vmas). It's also needed in write mode to avoid new
* altering the vma layout. It's also needed in write mode to avoid new
* anon_vmas to be associated with existing vmas.
*
* A single task can't take more than one mm_take_all_locks() in a row