mm: make vm_area_alloc() initialize core fields

Like vm_area_dup(), it initializes the anon_vma_chain head, and the
basic mm pointer.

The rest of the fields end up being different for different users,
although the plan is to also initialize the 'vm_ops' field to a dummy
entry.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds
2018-07-21 15:24:03 -07:00
parent 95faf6992d
commit 490fc05386
7 changed files with 17 additions and 26 deletions

View File

@@ -308,9 +308,15 @@ static struct kmem_cache *vm_area_cachep;
/* SLAB cache for mm_struct structures (tsk->mm) */
static struct kmem_cache *mm_cachep;
struct vm_area_struct *vm_area_alloc(void)
struct vm_area_struct *vm_area_alloc(struct mm_struct *mm)
{
return kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
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);
}
return vma;
}
struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig)