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From:   Qian Cai <cai@lca.pw>
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Date:   Tue, 28 Jan 2020 07:30:13 -0500
Subject: Re: [PATCH V12] mm/debug: Add tests validating architecture page table helpers
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Cc:     Anshuman Khandual <Anshuman.Khandual@arm.com>,
        Linux-MM <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>,
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        Dan Williams <dan.j.williams@intel.com>,
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        Michal Hocko <mhocko@kernel.org>,
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        Steven Price <Steven.Price@arm.com>,
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        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        Matthew Wilcox <willy@infradead.org>,
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        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>,
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        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>,
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To:     Mike Rapoport <rppt@linux.ibm.com>
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> On Jan 28, 2020, at 7:10 AM, Mike Rapoport <rppt@linux.ibm.com> wrote:
>=20
> Aren't x86 and arm64 not decent enough?
> Even if this test could be used to detect regressions only on these two
> platforms, the test is valuable.

The question is does it detect regressions good enough? Where is the list of=
 past bugs that it had found?

It is an usual deal for unproven debugging features remain out of tree first=
 and keep gathering unique bugs it found and then justify for a mainline inc=
lusion with enough data.=