Re: mm: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected in split_huge_page_to_list

[David Rientjes]

On Mon, 18 Jan 2016, Kirill A. Shutemov wrote:

> From 10859758dadfa249616870f63c1636ec9857c501 Mon Sep 17 00:00:00 2001
> From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
> Date: Mon, 18 Jan 2016 16:28:12 +0300
> Subject: [PATCH] thp: fix interrupt unsafe locking in split_huge_page()
> 
> split_queue_lock can be taken from interrupt context in some cases, but
> I forgot to convert locking in split_huge_page() to interrupt-safe
> primitives.
> 
> Let's fix this.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>

Acked-by: David Rientjes <rientjes@xxxxxxxxxx>