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    SubjectRe: [PATCH -mm 3/6] slub: introduce __kfree_rcu
    Christoph Lameter wrote:
    > On Tue, 3 Mar 2009, Lai Jiangshan wrote:
    >> +
    >> +void __kfree_rcu(const void *x, struct rcu_head *rcu)
    >> +{
    >> + call_rcu(rcu, kfree_rcu_callback);
    >> +}
    >> +EXPORT_SYMBOL(__kfree_rcu);
    >> +
    > The parameter x is unused why require it? I see that SLOB needs it. Cant
    > you do a similar trick as in SLUB just calculating the start address of
    > the object from the rcu address?

    The first parameter of __kfree_rcu() is unused in slab,slub,slqb.
    (I used it before, for CONFIG_SLUB_DEBUG=y ...etc. But I found
    these debugging code is needless)

    Object sizes of the memory objects in slob's kmalloc-slab are various.
    We hardly calculate the start address of the object from the rcu address.


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