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mm: make vm_area_dup() actually copy the old vma data

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.. and re-initialize th eanon_vma_chain head.

This removes some boiler-plate from the users, and also makes it clear
why it didn't need use the 'zalloc()' version.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2018-07-21 14:48:45 -07:00
parent 3928d4f5ee
commit 95faf6992d
3 changed files with 7 additions and 11 deletions
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10
kernel/fork.c
View file

@ -315,7 +315,13 @@ struct vm_area_struct *vm_area_alloc(void)
struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig)
{
return kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
struct vm_area_struct *new = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
if (new) {
*new = *orig;
INIT_LIST_HEAD(&new->anon_vma_chain);
}
return new;
}
void vm_area_free(struct vm_area_struct *vma)
@ -473,8 +479,6 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
tmp = vm_area_dup(mpnt);
if (!tmp)
goto fail_nomem;
*tmp = *mpnt;
INIT_LIST_HEAD(&tmp->anon_vma_chain);
retval = vma_dup_policy(mpnt, tmp);
if (retval)
goto fail_nomem_policy;