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SubjectRe: [RFC][PATCH] slub: Check for page NULL before doing the node_match check
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On Thu, 2013-01-17 at 21:51 +0000, Christoph Lameter wrote:

> Ditto which leaves us with:

Except...

>
> Index: linux/mm/slub.c
> ===================================================================
> --- linux.orig/mm/slub.c 2013-01-17 15:49:57.417491975 -0600
> +++ linux/mm/slub.c 2013-01-17 15:50:49.010287150 -0600
> @@ -1993,8 +1993,9 @@ static inline void flush_slab(struct kme
> deactivate_slab(s, c->page, c->freelist);
>
> c->tid = next_tid(c->tid);
> - c->page = NULL;
> c->freelist = NULL;

+ /*
+ * Preemption may be enabled here, and if the task is preempted
+ * other tasks require that freelist is NULL if page is NULL.
+ */

> + barrier();
> + c->page = NULL;
> }
>
> /*

-- Steve



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