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lockdep: annotate mm_take_all_locks() 

The nesting is correct due to holding mmap_sem, use the new annotation
to annotate this.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-08-11 09:30:25 +02:00 committed by Ingo Molnar
parent b7d39aff91
commit 454ed842d5
1 changed files with 6 additions and 6 deletions
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12
mm/mmap.c
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@ -2273,14 +2273,14 @@ int install_special_mapping(struct mm_struct *mm,
static DEFINE_MUTEX(mm_all_locks_mutex);
static void vm_lock_anon_vma(struct anon_vma *anon_vma)
static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma)
{
if (!test_bit(0, (unsigned long *) &anon_vma->head.next)) {
/*
* The LSB of head.next can't change from under us
* because we hold the mm_all_locks_mutex.
*/
spin_lock(&anon_vma->lock);
spin_lock_nest_lock(&anon_vma->lock, &mm->mmap_sem);
/*
* We can safely modify head.next after taking the
* anon_vma->lock. If some other vma in this mm shares
@ -2296,7 +2296,7 @@ static void vm_lock_anon_vma(struct anon_vma *anon_vma)
}
}
static void vm_lock_mapping(struct address_space *mapping)
static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping)
{
if (!test_bit(AS_MM_ALL_LOCKS, &mapping->flags)) {
/*
@ -2310,7 +2310,7 @@ static void vm_lock_mapping(struct address_space *mapping)
*/
if (test_and_set_bit(AS_MM_ALL_LOCKS, &mapping->flags))
BUG();
spin_lock(&mapping->i_mmap_lock);
spin_lock_nest_lock(&mapping->i_mmap_lock, &mm->mmap_sem);
}
}
@ -2359,9 +2359,9 @@ int mm_take_all_locks(struct mm_struct *mm)
if (signal_pending(current))
goto out_unlock;
if (vma->anon_vma)
vm_lock_anon_vma(vma->anon_vma);
vm_lock_anon_vma(mm, vma->anon_vma);
if (vma->vm_file && vma->vm_file->f_mapping)
vm_lock_mapping(vma->vm_file->f_mapping);
vm_lock_mapping(mm, vma->vm_file->f_mapping);
}
ret = 0;