linux-kernel - Re: [mm/debug] fa6726c1e7: kernel_BUG_at

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Message-Id: <D30E4C88-408A-438B-803B-D9F8F82D87A7@lca.pw>
Date:   Mon, 27 Apr 2020 22:51:04 -0400
From:   Qian Cai <cai@....pw>
To:     Anshuman Khandual <Anshuman.Khandual@....com>
Cc:     kernel test robot <lkp@...el.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Christophe Leroy <christophe.leroy@....fr>,
        Catalin Marinas <catalin.marinas@....com>,
        Ingo Molnar <mingo@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Will Deacon <will@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: Re: [mm/debug] fa6726c1e7: kernel_BUG_at_include/linux/mm.h



> On Apr 27, 2020, at 10:35 PM, Anshuman Khandual <Anshuman.Khandual@....com> wrote:
> 
> Letting CONFIG_DEBUG_VM_PGTABLE enabled via CONFIG_EXPERT for unsupported
> platforms i.e without ARCH_HAS_DEBUG_VM_PGTABLE, was a conscious decision
> meant to expand it's adaptability and coverage without requiring any code
> (i.e Kconfig) change. The easier it is to enable the test on unsupported
> platforms right now, more folks are likely to try it out thus increasing
> it's probability to get fixed on those platforms. That is a valid enough
> reason to have CONFIG_EXPERT based enablement method, IMHO. Also even with
> CONFIG_EXPERT set, CONFIG_DEBUG_VM_PGTABLE does not get enabled by default
> automatically.

No, I am talking about PAE. There is a distinction between known broken that nobody cares (like arm32) and in-progress/unknown status (like s390).

Also, it is not very nice to introduce regressions for robots when testing PAE because they always select CONFIG__EXPERT and CONFIG_DEBUG_VM.