On Tue, 6 Mar 2012 20:13:24 +0800
Sha Zhengju <handai.szj@xxxxxxxxx> wrote:
> From: Sha Zhengju <handai.szj@xxxxxxxxxx>
>
> When the last event is unregistered, there is no need to keep the spare
> array anymore. So free it to avoid memory leak.
>
> Signed-off-by: Sha Zhengju <handai.szj@xxxxxxxxxx>
>
> ---
> mm/memcontrol.c | 6 ++++++
> 1 files changed, 6 insertions(+), 0 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 22d94f5..3c09a84 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -4412,6 +4412,12 @@ static void mem_cgroup_usage_unregister_event(struct cgroup *cgrp,
> swap_buffers:
> /* Swap primary and spare array */
> thresholds->spare = thresholds->primary;
> + /* If all events are unregistered, free the spare array */
> + if (!new) {
> + kfree(thresholds->spare);
> + thresholds->spare = NULL;
> + }
> +
Could you clear thresholds->primary ? I don't like a pointer points to freed memory.
Thanks,
-Kame
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