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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-07-21 15:24:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-07-21 15:24:03 -0700 |
| commit | 490fc053865c9cc40f1085ef8a5504f5341f79d2 (patch) | |
| tree | 95f2e6e189cdae1a5e638b7ea4e39502605eaaa8 /kernel/fork.c | |
| parent | 95faf6992df468f617edb788da8c21c6eed0dfa7 (diff) | |
| download | lwn-490fc053865c9cc40f1085ef8a5504f5341f79d2.tar.gz lwn-490fc053865c9cc40f1085ef8a5504f5341f79d2.zip | |
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 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 67253e41bfb0..a191c05e757d 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -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) |