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Commit e4c5800a authored by Konstantin Khlebnikov's avatar Konstantin Khlebnikov Committed by Linus Torvalds
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mm/rmap: replace BUG_ON(anon_vma->degree) with VM_WARN_ON 



This check effectively catches anon vma hierarchy inconsistence and some
vma corruptions.  It was effective for catching corner cases in anon vma
reusing logic.  For now this code seems stable so check could be hidden
under CONFIG_DEBUG_VM and replaced with WARN because it's not so fatal.

Signed-off-by: default avatarKonstantin Khlebnikov <khlebnikov@yandex-team.ru>
Suggested-by: default avatarVasily Averin <vvs@virtuozzo.com>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fee83b3a

mm/rmap.c

+1 −1
Original line number Diff line number Diff line
@@ -409,7 +409,7 @@ void unlink_anon_vmas(struct vm_area_struct *vma) 
	list_for_each_entry_safe(avc, next, &vma->anon_vma_chain, same_vma) {

		struct anon_vma *anon_vma = avc->anon_vma;



		BUG_ON(anon_vma->degree);

		VM_WARN_ON(anon_vma->degree);

		put_anon_vma(anon_vma);



		list_del(&avc->same_vma);