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authorLinus Torvalds <torvalds@linux-foundation.org>2018-07-22 01:24:03 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-07-22 01:24:03 +0300
commit490fc053865c9cc40f1085ef8a5504f5341f79d2 (patch)
tree95f2e6e189cdae1a5e638b7ea4e39502605eaaa8 /mm/mmap.c
parent95faf6992df468f617edb788da8c21c6eed0dfa7 (diff)
downloadlinux-490fc053865c9cc40f1085ef8a5504f5341f79d2.tar.xz
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>
Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c12
1 files changed, 3 insertions, 9 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index b0ed8ce1b67e..ff1944d8d458 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1729,19 +1729,17 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
* specific mapper. the address has already been validated, but
* not unmapped, but the maps are removed from the list.
*/
- vma = vm_area_alloc();
+ vma = vm_area_alloc(mm);
if (!vma) {
error = -ENOMEM;
goto unacct_error;
}
- vma->vm_mm = mm;
vma->vm_start = addr;
vma->vm_end = addr + len;
vma->vm_flags = vm_flags;
vma->vm_page_prot = vm_get_page_prot(vm_flags);
vma->vm_pgoff = pgoff;
- INIT_LIST_HEAD(&vma->anon_vma_chain);
if (file) {
if (vm_flags & VM_DENYWRITE) {
@@ -2979,14 +2977,12 @@ static int do_brk_flags(unsigned long addr, unsigned long len, unsigned long fla
/*
* create a vma struct for an anonymous mapping
*/
- vma = vm_area_alloc();
+ vma = vm_area_alloc(mm);
if (!vma) {
vm_unacct_memory(len >> PAGE_SHIFT);
return -ENOMEM;
}
- INIT_LIST_HEAD(&vma->anon_vma_chain);
- vma->vm_mm = mm;
vma->vm_start = addr;
vma->vm_end = addr + len;
vma->vm_pgoff = pgoff;
@@ -3343,12 +3339,10 @@ static struct vm_area_struct *__install_special_mapping(
int ret;
struct vm_area_struct *vma;
- vma = vm_area_alloc();
+ vma = vm_area_alloc(mm);
if (unlikely(vma == NULL))
return ERR_PTR(-ENOMEM);
- INIT_LIST_HEAD(&vma->anon_vma_chain);
- vma->vm_mm = mm;
vma->vm_start = addr;
vma->vm_end = addr + len;