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mm: make vm_area_alloc() initialize core fields

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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
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4
arch/ia64/kernel/perfmon.c
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@@ -2278,17 +2278,15 @@ pfm_smpl_buffer_alloc(struct task_struct *task, struct file *filp, pfm_context_t
DPRINT(("smpl_buf @%p\n", smpl_buf));
/* allocate vma */
vma = vm_area_alloc();
vma = vm_area_alloc(mm);
if (!vma) {
DPRINT(("Cannot allocate vma\n"));
goto error_kmem;
}
INIT_LIST_HEAD(&vma->anon_vma_chain);
/*
* partially initialize the vma for the sampling buffer
*/
vma->vm_mm = mm;
vma->vm_file = get_file(filp);
vma->vm_flags = VM_READ|VM_MAYREAD|VM_DONTEXPAND|VM_DONTDUMP;
vma->vm_page_prot = PAGE_READONLY; /* XXX may need to change */