Re: [patch] mm: fix lockless pagecache reordering bug (was Re: BUG: soft lockup - is this XFS problem?)

Roman Kononov
2009-01-06T16:16:38Z

On 2009-01-05 20:05 Nick Piggin said the following:
> Subject: mm lockless pagecache barrier fix
> static inline void *radix_tree_deref_slot(void **pslot)
> {
> - void *ret = *pslot;
> + void *ret = rcu_dereference(*pslot);
> if (unlikely(radix_tree_is_indirect_ptr(ret)))
> ret = RADIX_TREE_RETRY;
> return ret;

3 systems are working fine for a few hours with the patch. They would
fail within 20 minutes without it.

Thanks.