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

From	Andrew Morton <akpm@linux-foundation.org>
Newsgroups	linux.kernel
Subject	Re: mm: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected in split_huge_page_to_list
Date	2016-01-20 07:50 +0100
Message-ID	<qSUKC-2IV-17@gated-at.bofh.it> (permalink)
References	<qShJg-13I-15@gated-at.bofh.it> <qSici-1gC-21@gated-at.bofh.it> <qSTOz-25l-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, 20 Jan 2016 11:15:32 +0530 "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> wrote:

> >
> > I think this should fix the issue:
> >
> > 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.
> 
> Can you add the stack trace from the problem reported to the commit
> message ?

I have already done this.

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mm: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected in split_huge_page_to_list Dmitry Vyukov <dvyukov@google.com> - 2016-01-18 14:10 +0100
  Re: mm: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected in  split_huge_page_to_list "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-01-18 14:40 +0100
    Re: mm: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected in  split_huge_page_to_list David Rientjes <rientjes@google.com> - 2016-01-19 23:30 +0100
    Re: mm: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected in split_huge_page_to_list "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2016-01-20 06:50 +0100
      Re: mm: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected in  split_huge_page_to_list Andrew Morton <akpm@linux-foundation.org> - 2016-01-20 07:50 +0100

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