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SubjectRe: [PATCH V5 1/1] rcu: introduce kfree_rcu()
On Friday 18 March 2011, Lai Jiangshan wrote:
> kfree_rcu() which was original proposed by Lai 2.5 years ago is one of
> the most important RCU TODO list entries, Lai and Manfred have worked on
> patches for this. This V4 patch is based on the Manfred's patch and
> the V1 of Lai's patch. (These two patches are almost the same
> in implementation, and this patch is mainly based on the Manfred's).
> Lai's V1 patch:
> Manfred's patch:
> RCU TODO list:
> This new introduced API kfree_rcu() primitive kfree()s the specified memory
> after a RCU grace period elapses.
> It replaces many simple "call_rcu(head, simple_kfree_callback)";
> These many simple_kfree_callback() instances just does
> kfree(containerof(head,struct whatever_struct,rcu_member));
> These simple_kfree_callback() instances are just duplicate code, we need
> a generic function for them.
> And kfree_rcu() is also help for unloadable modules, kfree_rcu() does not
> queue any function which belong to the module, so a rcu_barrier() can
> be avoid when module exit. (If we queue any other function by call_rcu(),
> rcu_barrier() is still needed.)
> Signed-off-by: Lai Jiangshan <>
> Signed-off-by: Manfred Spraul <>

Acked-by: Arnd Bergmann <>

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