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    SubjectRe: [patch] mm: fix lockless pagecache reordering bug (was Re: BUG: soft lockup - is this XFS problem?)
    On Tue, Jan 06, 2009 at 09:38:15AM +0100, Peter Klotz wrote:
    > >Index: linux-2.6/include/linux/radix-tree.h
    > >===================================================================
    > >--- linux-2.6.orig/include/linux/radix-tree.h
    > >+++ linux-2.6/include/linux/radix-tree.h
    > >@@ -136,7 +136,7 @@ do { \
    > > */
    > > 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;
    > >
    > >
    >
    > The patch above fixes my problem. I did two complete test runs that
    > normally fail rather quickly.

    OK, thanks for reporting and testing.

    I think this patch is a candidate for -stable too.

    Thanks,
    Nick


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