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From: Qian Cai <cai@lca.pw>
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Subject: Re: [PATCH V8] mm/debug: Add tests validating architecture page table
 helpers
Date: Tue, 29 Oct 2019 06:31:11 -0400
Message-Id: <B6AAFA3F-745D-48E2-98CC-CFB30934CE39@lca.pw>
References: <1572240562-23630-1-git-send-email-anshuman.khandual@arm.com>
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To: Anshuman Khandual <Anshuman.Khandual@arm.com>
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Cc: Mark Rutland <Mark.Rutland@arm.com>, linux-ia64@vger.kernel.org,
 linux-sh@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
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> On Oct 28, 2019, at 1:29 AM, Anshuman Khandual <Anshuman.Khandual@arm.com>=
 wrote:
>=20
> This adds tests which will validate architecture page table helpers and
> other accessors in their compliance with expected generic MM semantics.
> This will help various architectures in validating changes to existing
> page table helpers or addition of new ones.
>=20
> This test covers basic page table entry transformations including but not
> limited to old, young, dirty, clean, write, write protect etc at various
> level along with populating intermediate entries with next page table page=

> and validating them.
>=20
> Test page table pages are allocated from system memory with required size
> and alignments. The mapped pfns at page table levels are derived from a
> real pfn representing a valid kernel text symbol. This test gets called
> right after page_alloc_init_late().
>=20
> This gets build and run when CONFIG_DEBUG_VM_PGTABLE is selected along wit=
h
> CONFIG_VM_DEBUG. Architectures willing to subscribe this test also need to=

> select CONFIG_ARCH_HAS_DEBUG_VM_PGTABLE which for now is limited to x86 an=
d
> arm64. Going forward, other architectures too can enable this after fixing=

> build or runtime problems (if any) with their page table helpers.
>=20
> Folks interested in making sure that a given platform's page table helpers=

> conform to expected generic MM semantics should enable the above config
> which will just trigger this test during boot. Any non conformity here wil=
l
> be reported as an warning which would need to be fixed. This test will hel=
p
> catch any changes to the agreed upon semantics expected from generic MM an=
d
> enable platforms to accommodate it thereafter.

This looks like a perfect candidate to streamline with the new kunit framewo=
rk, no?=