linux-kernel - Re: [PATCH v2 1/2] kasan: free allocated shadow memory on MEM_CANCEL

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Message-ID: <6666c564-916d-a145-183c-362e6f72c409@virtuozzo.com>
Date:   Tue, 22 May 2018 19:26:43 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     David Hildenbrand <david@...hat.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "open list:KASAN" <kasan-dev@...glegroups.com>
Subject: Re: [PATCH v2 1/2] kasan: free allocated shadow memory on
 MEM_CANCEL_ONLINE



On 05/22/2018 01:07 PM, David Hildenbrand wrote:
> We have to free memory again when we cancel onlining, otherwise a later
> onlining attempt will fail.
> 
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---

Fixes: fa69b5989bb0 ("mm/kasan: add support for memory hotplug")
Acked-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: <stable@...r.kernel.org>

>  mm/kasan/kasan.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
> index 135ce2838c89..53564229674b 100644
> --- a/mm/kasan/kasan.c
> +++ b/mm/kasan/kasan.c
> @@ -867,6 +867,7 @@ static int __meminit kasan_mem_notifier(struct notifier_block *nb,
>  		kmemleak_ignore(ret);
>  		return NOTIFY_OK;
>  	}
> +	case MEM_CANCEL_ONLINE:
>  	case MEM_OFFLINE: {
>  		struct vm_struct *vm;
>  
>