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From:   Naresh Kamboju <naresh.kamboju@linaro.org>
Date:   Sat, 11 Jul 2020 22:57:38 +0530
Message-ID: <CA+G9fYusSSrc5G_pZV6Lc-LjjkzQcc3EsLMo+ejSzvyRcMgbqw@mail.gmail.com>
Subject: Re: WARNING: at mm/mremap.c:211 move_page_tables in i386
To:     Linus Torvalds <torvalds@linux-foundation.org>,
        Joel Fernandes <joel@joelfernandes.org>
Cc:     "Kirill A. Shutemov" <kirill@shutemov.name>,
        William Kucharski <william.kucharski@oracle.com>,
        linux- stable <stable@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        linux-mm <linux-mm@kvack.org>, Arnd Bergmann <arnd@arndb.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Roman Gushchin <guro@fb.com>, Michal Hocko <mhocko@kernel.org>,
        lkft-triage@lists.linaro.org, Chris Down <chris@chrisdown.name>,
        Michel Lespinasse <walken@google.com>,
        Fan Yang <Fan_Yang@sjtu.edu.cn>,
        Brian Geffon <bgeffon@google.com>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        Will Deacon <will@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>, pugaowei@gmail.com,
        Jerome Glisse <jglisse@redhat.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Mel Gorman <mgorman@techsingularity.net>,
        Hugh Dickins <hughd@google.com>,
        Al Viro <viro@zeniv.linux.org.uk>, Tejun Heo <tj@kernel.org>,
        Sasha Levin <sashal@kernel.org>
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On Sat, 11 Jul 2020 at 01:35, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> On Fri, Jul 10, 2020 at 10:48 AM Naresh Kamboju
> <naresh.kamboju@linaro.org> wrote:

I have started bisecting this problem and found the first bad commit

commit 9f132f7e145506efc0744426cb338b18a54afc3b
Author: Joel Fernandes (Google) <joel@joelfernandes.org>
Date:   Thu Jan 3 15:28:41 2019 -0800

    mm: select HAVE_MOVE_PMD on x86 for faster mremap

    Moving page-tables at the PMD-level on x86 is known to be safe.  Enable
    this option so that we can do fast mremap when possible.

    Link: http://lkml.kernel.org/r/20181108181201.88826-4-joelaf@google.com
    Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
    Suggested-by: Kirill A. Shutemov <kirill@shutemov.name>
    Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
    Cc: Julia Lawall <Julia.Lawall@lip6.fr>
    Cc: Michal Hocko <mhocko@kernel.org>
    Cc: William Kucharski <william.kucharski@oracle.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e260460210e1..6185d4f33296 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -172,6 +172,7 @@ config X86
  select HAVE_MEMBLOCK_NODE_MAP
  select HAVE_MIXED_BREAKPOINTS_REGS
  select HAVE_MOD_ARCH_SPECIFIC
+ select HAVE_MOVE_PMD
  select HAVE_NMI
  select HAVE_OPROFILE
  select HAVE_OPTPROBES


After reverting the above patch the reported kernel warning got fixed on
Linus mainline tree 5.8.0-rc4.

-- 
Linaro LKFT
https://lkft.linaro.org