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h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=TcrqUl2GOeCmADC+jcCe/JsSC8+pdpNPcZ+lZEqkLwHaF82/grSesMT2K8TGrEkh8 Qc3oT/5ZQjSahcQhuvh7uXmdSxiUefczLAMViYr1PQ+k3g3NIwl+tJWn304rX67Hed cHuJUz2DRzDomCBX+TgkYOUQ70K+qqdbA41d7D/k= Message-ID: <9aed35be-a411-4d9d-805c-03c836e9e56a@arm.com> Date: Mon, 21 Sep 2026 11:55:02 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/4] arm64/mm: Convert pgtable READ_ONCE() as pxdp_get() To: Anshuman Khandual , linux-arm-kernel@lists.infradead.org Cc: Catalin Marinas , Will Deacon , Mark Rutland , Lorenzo Stoakes , Andrew Morton , David Hildenbrand , Mike Rapoport , Linu Cherian , linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20260903060657.2717457-1-anshuman.khandual@arm.com> From: Ryan Roberts Content-Language: en-GB In-Reply-To: <20260903060657.2717457-1-anshuman.khandual@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: 7tuzu4oyipg1y7z5ka8y6hbzjeu64q4e X-Rspamd-Queue-Id: 94D101A0006 X-Rspamd-Server: rspam07 X-HE-Tag: 1789988107-390008 X-HE-Meta: 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 msgRRs/f 4GHcWqsVNEL+iTwQLN0z6zMatRHPphPWyRStBSjK+S3KkCVe/oHbnBaw2oi2k2obnc+RppparZwpZ2WNqMbDM+4BtD100ODlmhsW9FzC5uF5F8VY6Q2747mCQmpE9l0An9ygCShZa55ElG2VC8Ji/+6e7sj+XS4zjI4pCcLvTygU+1iqqhhNttymDHtb3p7pS57BB3YP3mGtzE7xv7OBKPTeUkLYIdRsn63yPEn95hAs2xl6treQeGn/UWR0sXq6VLfbZCHEGiOnMTa75aiilT8miVtNbCc3cKrO1QC3XydjxKF3zCRBciEAABZkTjl88evR3W2udVvZG6McwQjRsfT2/L0CUXwLGo89GHP9zOhK4rk6iGJKrQ5Ld9N+7juHmS5NZy+EBKhjUpEsMqhfRp0e/Xe5R1By9lgwtmdhGqBSXcjqh1ZMZ0zmnPTN+b9/GAJIMbGco6NOIok9mW2iYUDCpIA2EJoGXocLSFpHlc4FzPc4h6tuddYSTnHIegqPoxUB+RJsl+mvdRJpvIhc3amnIkA8HGlXbSLgxLqpNFdWhlAL0fZsCHQT5nKncHXShrXHU Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 03/09/2026 07:06, Anshuman Khandual wrote: > Route READ_ONCE() accesses on pgtable entries via level specific generic MM > pxdp_get() helpers which platforms could then override when required. These > accessors on arm64, will help in ensuring page table accesses are performed > in an atomic manner while reading 128 bit page table entries later. But for > now they just default to READ_ONCE(), thus preserving existing behaviour on > current D64 translation. > > This is similar to generic MM, where all atomic accesses have already been > converted from READ_ONCE() into pgtable level specific accessors. > > These are preparatory patches for D128 enablement, although standing their > own for D64 translation as well. These patches are split from earlier D128 > V1 series. There are no functional changes here, and besides mm kselftests > do not show any regression. > > https://lore.kernel.org/linux-mm/20260729122452.3797443-1-anshuman.khandual@arm.com/ > > This series applies on v3.7-rc1 but after applying the following patches I assume you meant v7.3-rc1 here? > related to pgtable entry print standardization posted earlier. > > https://lore.kernel.org/linux-mm/20260831054331.625505-1-anshuman.khandual@arm.com/ This applies. > > https://lore.kernel.org/linux-mm/20260901065454.1906343-1-anshuman.khandual@arm.com/ This fails: ---8<--- $ b4 shazam 20260901065454.1906343-1-anshuman.khandual@arm.com Grabbing thread from lore.kernel.org/all/20260901065454.1906343-1-anshuman.khandual@arm.com/t.mbox.gz Checking for newer revisions Grabbing search results from lore.kernel.org Added from v3: 3 patches Added from v2: 3 patches Analyzing 14 messages in the thread Looking for additional code-review trailers on lore.kernel.org Will use the latest revision: v3 You can pick other revisions using the -vN flag Checking attestation on all messages, may take a moment... --- ✓ [PATCH v3 1/2] arm64/mm: Move __check_safe_pte_update() ✓ [PATCH v3 2/2] arm64/mm: Standardize printing for pgtable entries --- ✓ Signed: DKIM/arm.com --- Total patches: 2 --- Applying: arm64/mm: Move __check_safe_pte_update() Applying: arm64/mm: Standardize printing for pgtable entries Patch failed at 0002 arm64/mm: Standardize printing for pgtable entries When you have resolved this problem, run "git am --continue". If you prefer to skip this patch, run "git am --skip" instead. To restore the original branch and stop patching, run "git am --abort". error: patch failed: arch/arm64/mm/fault.c:160 error: arch/arm64/mm/fault.c: patch does not apply hint: Use 'git am --show-current-patch=diff' to see the failed patch ---8<--- And as a result I can't apply this series. Any tips? Thanks, Ryan > > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Ryan Roberts > Cc: Mark Rutland > Cc: Lorenzo Stoakes > Cc: Andrew Morton > Cc: David Hildenbrand > Cc: Mike Rapoport > Cc: Linu Cherian > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Cc: linux-mm@kvack.org > > Anshuman Khandual (4): > arm64/mm: Convert READ_ONCE() as pmdp_get() while accessing PMD > arm64/mm: Convert READ_ONCE() as pudp_get() while accessing PUD > arm64/mm: Convert READ_ONCE() as p4dp_get() while accessing P4D > arm64/mm: Convert READ_ONCE() as pgdp_get() while accessing PGD > > arch/arm64/include/asm/pgtable.h | 6 ++-- > arch/arm64/mm/fault.c | 8 ++--- > arch/arm64/mm/fixmap.c | 6 ++-- > arch/arm64/mm/hugetlbpage.c | 10 +++--- > arch/arm64/mm/kasan_init.c | 18 +++++----- > arch/arm64/mm/mmu.c | 60 ++++++++++++++++---------------- > arch/arm64/mm/pageattr.c | 8 ++--- > arch/arm64/mm/trans_pgd.c | 14 ++++---- > 8 files changed, 66 insertions(+), 64 deletions(-) >