From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Anshuman Khandual <anshuman.khandual@arm.com>,
linux-arm-kernel@lists.infradead.org
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Ryan Roberts <ryan.roberts@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Rapoport <rppt@kernel.org>,
Linu Cherian <linu.cherian@arm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
kasan-dev@googlegroups.com
Subject: Re: [RFC V1 08/16] arm64/mm: Convert READ_ONCE() as pgdp_get() while accessing PGD
Date: Wed, 8 Apr 2026 14:19:28 +0200 [thread overview]
Message-ID: <e294a87b-392b-4b12-bd12-70c66c793fcd@kernel.org> (raw)
In-Reply-To: <20260224051153.3150613-9-anshuman.khandual@arm.com>
On 2/24/26 06:11, Anshuman Khandual wrote:
> Convert all READ_ONCE() based PGD accesses as pgdp_get() instead which will
> support both D64 and D128 translation regime going forward.
Please mention here why you move p4d_offset_phys/p4d_offset. (same
applies to other patches)
Do we get additional function calls that might degrade some page table
walkers?
Same comment regarding BUG_ON.
--
Cheers,
David
next prev parent reply other threads:[~2026-04-08 12:19 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-24 5:11 [RFC V1 00/16] arm64/mm: Enable 128 bit page table entries Anshuman Khandual
2026-02-24 5:11 ` [RFC V1 01/16] mm: Abstract printing of pxd_val() Anshuman Khandual
2026-02-26 12:34 ` Usama Arif
2026-02-26 12:49 ` Anshuman Khandual
2026-02-24 5:11 ` [RFC V1 02/16] mm: Add read-write accessors for vm_page_prot Anshuman Khandual
2026-02-24 5:11 ` [RFC V1 03/16] mm: Replace READ_ONCE() in pud_trans_unstable() Anshuman Khandual
2026-02-24 5:11 ` [RFC V1 04/16] perf/events: Replace READ_ONCE() with standard pgtable accessors Anshuman Khandual
2026-02-24 8:48 ` Peter Zijlstra
2026-02-24 10:08 ` Mark Rutland
2026-02-24 10:41 ` Peter Zijlstra
2026-02-24 11:22 ` Ryan Roberts
2026-02-24 12:49 ` Anshuman Khandual
2026-02-24 12:39 ` Anshuman Khandual
2026-02-24 12:53 ` Anshuman Khandual
2026-02-24 5:11 ` [RFC V1 05/16] arm64/mm: Convert READ_ONCE() as pmdp_get() while accessing PMD Anshuman Khandual
2026-04-08 12:11 ` David Hildenbrand (Arm)
2026-02-24 5:11 ` [RFC V1 06/16] arm64/mm: Convert READ_ONCE() as pudp_get() while accessing PUD Anshuman Khandual
2026-04-08 12:15 ` David Hildenbrand (Arm)
2026-02-24 5:11 ` [RFC V1 07/16] arm64/mm: Convert READ_ONCE() as p4dp_get() while accessing P4D Anshuman Khandual
2026-04-08 12:17 ` David Hildenbrand (Arm)
2026-02-24 5:11 ` [RFC V1 08/16] arm64/mm: Convert READ_ONCE() as pgdp_get() while accessing PGD Anshuman Khandual
2026-04-08 12:19 ` David Hildenbrand (Arm) [this message]
2026-02-24 5:11 ` [RFC V1 09/16] arm64/mm: Route all pgtable reads via ptdesc_get() Anshuman Khandual
2026-02-28 11:17 ` Mike Rapoport
2026-03-02 4:34 ` Anshuman Khandual
2026-04-08 12:25 ` David Hildenbrand (Arm)
2026-02-24 5:11 ` [RFC V1 10/16] arm64/mm: Route all pgtable writes via ptdesc_set() Anshuman Khandual
2026-02-26 12:37 ` Usama Arif
2026-02-26 12:54 ` Anshuman Khandual
2026-02-26 13:19 ` Ryan Roberts
2026-02-27 6:19 ` Anshuman Khandual
2026-02-24 5:11 ` [RFC V1 11/16] arm64/mm: Route all pgtable atomics to central helpers Anshuman Khandual
2026-04-08 12:28 ` David Hildenbrand (Arm)
2026-02-24 5:11 ` [RFC V1 12/16] arm64/mm: Abstract printing of pxd_val() Anshuman Khandual
2026-04-08 12:28 ` David Hildenbrand (Arm)
2026-02-24 5:11 ` [RFC V1 13/16] arm64/mm: Override read-write accessors for vm_page_prot Anshuman Khandual
2026-02-24 5:11 ` [RFC V1 14/16] arm64/mm: Enable fixmap with 5 level page table Anshuman Khandual
2026-04-08 12:29 ` David Hildenbrand (Arm)
2026-02-24 5:11 ` [RFC V1 15/16] arm64/mm: Add macros __tlb_asid_level and __tlb_range Anshuman Khandual
2026-02-24 5:11 ` [RFC V1 16/16] arm64/mm: Add initial support for FEAT_D128 page tables Anshuman Khandual
2026-02-26 14:10 ` Usama Arif
2026-04-07 14:44 ` [RFC V1 00/16] arm64/mm: Enable 128 bit page table entries David Hildenbrand (Arm)
2026-04-08 10:53 ` Anshuman Khandual
2026-04-08 11:01 ` Ryan Roberts
2026-04-08 12:13 ` David Hildenbrand (Arm)
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