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Date: Tue, 19 Jan 2016 14:26:25 -0800 (PST)
From: David Rientjes <rientjes@google.com>
Subject: Re: mm: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected in
 split_huge_page_to_list
In-Reply-To: <20160118133852.GC14531@node.shutemov.name>
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References: <CACT4Y+ayDrEmn31qyoVdnq6vpSbL=XzFWPM5_Ee4GH=Waf27eA@mail.gmail.com> <20160118133852.GC14531@node.shutemov.name>
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To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Dmitry Vyukov <dvyukov@google.com>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Sasha Levin <sasha.levin@oracle.com>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, jmarchan@redhat.com, Hugh Dickins <hughd@google.com>, Dave Hansen <dave.hansen@intel.com>, Andrew Morton <akpm@linux-foundation.org>, Linus Torvalds <torvalds@linux-foundation.org>, Vlastimil Babka <vbabka@suse.cz>, Mel Gorman <mgorman@techsingularity.net>, Ebru Akagunduz <ebru.akagunduz@gmail.com>, Dan Williams <dan.j.williams@intel.com>, Minchan Kim <minchan@kernel.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, syzkaller <syzkaller@googlegroups.com>, Kostya Serebryany <kcc@google.com>, Alexander Potapenko <glider@google.com>

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

> From 10859758dadfa249616870f63c1636ec9857c501 Mon Sep 17 00:00:00 2001
> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
> 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@linux.intel.com>
> Reported-by: Dmitry Vyukov <dvyukov@google.com>

Acked-by: David Rientjes <rientjes@google.com>

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