On 08/24/2012 08:17 PM, Christoph Lameter wrote:
> Add additional debugging to check that the objects is actually from the cache
> the caller claims. Doing so currently trips up some other debugging code. It
> takes a lot to infer from that what was happening.
>
> V2: Only warn once.
>
> Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
I am fine with it.
Reviewed-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
> ---
> mm/slub.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/mm/slub.c b/mm/slub.c
> index c67bd0a..00f8557 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -2614,6 +2614,13 @@ void kmem_cache_free(struct kmem_cache *s, void *x)
>
> page = virt_to_head_page(x);
>
> + if (kmem_cache_debug(s) && page->slab != s) {
> + printk("kmem_cache_free: Wrong slab cache. %s but object"
> + " is from %s\n", page->slab->name, s->name);
> + WARN_ON_ONCE(1);
> + return;
> + }
> +
> slab_free(s, page, x, _RET_IP_);
>
> trace_kmem_cache_free(_RET_IP_, x);
>
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