Re: [PATCH] mm/page_alloc: check high-order pages for corruption during PCP operations

[Shakeel Butt]

On Thu, Mar 10, 2022 at 09:24:56AM +0000, Mel Gorman wrote:
> Eric Dumazet pointed out that commit 44042b449872 ("mm/page_alloc: allow
> high-order pages to be stored on the per-cpu lists") only checks the head
> page during PCP refill and allocation operations. This was an oversight
> and all pages should be checked. This will incur a small performance
> penalty but it's necessary for correctness.

> Fixes: 44042b449872 ("mm/page_alloc: allow high-order pages to be stored  
> on the per-cpu lists")
> Reported-by: Eric Dumazet <edumazet@xxxxxxxxxx>
> Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
> Acked-by: Eric Dumazet <edumazet@xxxxxxxxxx>

Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>