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From:   Qian Cai <cai@lca.pw>
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Subject: Re: [PATCH V12] mm/debug: Add tests validating architecture page table helpers
Date:   Sun, 2 Feb 2020 06:26:29 -0500
Message-Id: <2C4ADFAE-7BB4-42B7-8F54-F036EA7A4316@lca.pw>
References: <473d8198-3ac4-af3b-e2ec-c0698a3565d3@c-s.fr>
Cc:     Anshuman Khandual <Anshuman.Khandual@arm.com>, linux-mm@kvack.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Dan Williams <dan.j.williams@intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Michal Hocko <mhocko@kernel.org>,
        Mark Rutland <Mark.Rutland@arm.com>,
        Mark Brown <broonie@kernel.org>,
        Steven Price <Steven.Price@arm.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Kees Cook <keescook@chromium.org>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        Matthew Wilcox <willy@infradead.org>,
        Sri Krishna chowdary <schowdary@nvidia.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Russell King - ARM Linux <linux@armlinux.org.uk>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Paul Mackerras <paulus@samba.org>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        "David S. Miller" <davem@davemloft.net>,
        Vineet Gupta <vgupta@synopsys.com>,
        James Hogan <jhogan@kernel.org>,
        Paul Burton <paul.burton@mips.com>,
        Ralf Baechle <ralf@linux-mips.org>,
        "Kirill A . Shutemov" <kirill@shutemov.name>,
        Gerald Schaefer <gerald.schaefer@de.ibm.com>,
        Ingo Molnar <mingo@kernel.org>,
        linux-snps-arc@lists.infradead.org, linux-mips@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
        linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
        x86@kernel.org, linux-kernel@vger.kernel.org,
        kasan-dev <kasan-dev@googlegroups.com>
In-Reply-To: <473d8198-3ac4-af3b-e2ec-c0698a3565d3@c-s.fr>
To:     Christophe Leroy <christophe.leroy@c-s.fr>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


> On Jan 30, 2020, at 9:13 AM, Christophe Leroy <christophe.leroy@c-s.fr> wr=
ote:
>=20
> config DEBUG_VM_PGTABLE
>    bool "Debug arch page table for semantics compliance" if ARCH_HAS_DEBUG=
_VM_PGTABLE || EXPERT
>    depends on MMU
>    default 'n' if !ARCH_HAS_DEBUG_VM_PGTABLE
>    default 'y' if DEBUG_VM

Does it really necessary to potentially force all bots to run this? Syzbot, k=
ernel test robot etc? Does it ever pay off for all their machine times there=
?=