From: Muhammad Usama Anjum <usama.anjum@arm.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>
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Subject: Re: [PATCH v3 3/9] mm: use hw_pte_t for generic PTE table storage
Date: Wed, 30 Sep 2026 18:40:28 +0100 [thread overview]
Message-ID: <63db3469-82d0-4997-9bcf-31bb3aa59deb@arm.com> (raw)
In-Reply-To: <xzlxdkrjilskjcagnl33eed7ijxrgfhoalmmmq5ks3wgjmkkhi@zchtxpr2amff>
On 30/09/2026 5:35 am, Anshuman Khandual wrote:
> On Tue, Sep 22, 2026 at 06:12:31PM +0100, Muhammad Usama Anjum wrote:
>> Generic page-table interfaces use pte_t * for both pointers to PTE table
>> storage and pointers to software PTE values. Convert the generic
>> declarations and their MM, fs, and kernel users together so parameters,
>> return types, callbacks, and local pointers that designate table storage
>> use hw_pte_t *.
>>
>> Include linux/pgtable_types.h from headers that expose the converted
>> interfaces. It continues to provide pgprot_t to vmalloc.h through
>> asm/page.h.
>>
>> Keep software PTE values as pte_t and retain pte_t * for value interfaces.
>>
>> No architecture selects ARCH_HAS_HW_PTE_T at this point, so hw_pte_t
>> remains an alias of pte_t and this changes the interface vocabulary without
>> changing representation or behavior.
>>
>> Most of this mechanical conversion was generated with the Coccinelle script
>> included in the cover letter. The script deliberately ignores pte_t *
>
> Just wondering - should this Coccinelle script that converted all these
> instances be saved inside ./scripts/coccinelle/ for future referene.
Thanks for the suggestion. This script was written for this one-time conversion
and requires manual review to distinguish HW PTE table pointers from SW PTE
pointers. After the conversion, it would not be useful.
(Maybe other arch can use it to do their conversion. But they can always
copy script from the series)
--
Thanks,
Usama
next prev parent reply other threads:[~2026-09-30 17:41 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-22 17:12 [PATCH v3 0/9] mm: distinguish HW PTE pointers from SW PTE value pointers Muhammad Usama Anjum
2026-09-22 17:12 ` [PATCH v3 1/9] mm: introduce hw_pte_t for PTE table storage Muhammad Usama Anjum
2026-09-30 4:13 ` Anshuman Khandual
2026-09-30 15:27 ` Zi Yan
2026-09-22 17:12 ` [PATCH v3 2/9] mm: rename pointers to software PTE values as ptentp Muhammad Usama Anjum
2026-09-30 4:20 ` Anshuman Khandual
2026-09-22 17:12 ` [PATCH v3 3/9] mm: use hw_pte_t for generic PTE table storage Muhammad Usama Anjum
2026-09-30 4:35 ` Anshuman Khandual
2026-09-30 17:40 ` Muhammad Usama Anjum [this message]
2026-09-22 17:12 ` [PATCH v3 4/9] mm: convert PTE table entries in ptep_get() Muhammad Usama Anjum
2026-09-30 5:10 ` Anshuman Khandual
2026-09-30 17:46 ` Muhammad Usama Anjum
2026-09-22 17:12 ` [PATCH v3 5/9] mm: convert PTE table entry to pte Muhammad Usama Anjum
2026-09-22 17:12 ` [PATCH v3 6/9] mm: add hw_pte_val for HW PTE storage Muhammad Usama Anjum
2026-09-22 17:12 ` [PATCH v3 7/9] mm/kasan: use hw_pte_t for the early shadow PTE table Muhammad Usama Anjum
2026-09-22 17:12 ` [PATCH v3 8/9] drm/i915: use hw_pte_t for PTE range callbacks Muhammad Usama Anjum
2026-09-22 17:12 ` [PATCH v3 9/9] xen: " Muhammad Usama Anjum
2026-09-28 7:09 ` [PATCH v3 0/9] mm: distinguish HW PTE pointers from SW PTE value pointers Alexander Gordeev
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