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pagewalk: use lockdep_assert_held for locking validation 

Use lockdep to check for held locks instead of using home grown asserts.

Link: https://lore.kernel.org/r/20190828141955.22210-4-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
alistair/sunxi64-5.4-dsi
Christoph Hellwig 2019-08-28 16:19:55 +02:00 committed by Jason Gunthorpe
parent 7b86ac3371
commit b4bc7817b2
1 changed files with 2 additions and 2 deletions
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4
mm/pagewalk.c
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@ -317,7 +317,7 @@ int walk_page_range(struct mm_struct *mm, unsigned long start,
if (!walk.mm)
return -EINVAL;
VM_BUG_ON_MM(!rwsem_is_locked(&walk.mm->mmap_sem), walk.mm);
lockdep_assert_held(&walk.mm->mmap_sem);
vma = find_vma(walk.mm, start);
do {
@ -367,7 +367,7 @@ int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
if (!walk.mm)
return -EINVAL;
VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
lockdep_assert_held(&walk.mm->mmap_sem);
err = walk_page_test(vma->vm_start, vma->vm_end, &walk);
if (err > 0)