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b=AZARGJ3JcXho1RUsuyVjdmvbw7j//GWeTKUnmTOOqDFrcOb04DLK8M888yegbgDba TNvNHKASvFgEcGqWmxxzq9lXwHll1f5YIeaR2WhL9E2qg78UYK0aGBvv1oLRZwWi/0 Mk91K5b4/ffwjyre8FM4CTxP1xyPKR/GnNEvtliQY+j2NzaQEuKcDzVnWcPbtnLQ4i jgf6ef91TYslZRHYwaUBvvaPl8hRYVEnt5vib+qNBBI+sZCCSZLxOziGhKTqsU8/D8 dp8/E8NQiSSiLITWhTBKL9k1gC9ujUM677udJZTURt7n8NdTW44lhgEL5FvxlyEqNM F7McwFdaL8gpg== Message-ID: <53e7992c-5319-4533-a0d2-d0fb55cebc25@kernel.org> Date: Mon, 7 Sep 2026 21:57:16 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/huge_memory: add folio_reset_partially_mapped() To: Kiryl Shutsemau , akpm@linux-foundation.org, ziy@nvidia.com, hannes@cmpxchg.org Cc: ljs@kernel.org, usama.arif@linux.dev, lance.yang@linux.dev, baolin.wang@linux.alibaba.com, liam@infradead.org, nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, kasong@tencent.com, hughd@google.com, balbirs@nvidia.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, "Kiryl Shutsemau (Meta)" References: <20260907183340.1446132-1-kirill@shutemov.name> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: B05C640002 X-Stat-Signature: k8hwzw4kwz97zjmcddbnwbskcs4wbgoo X-Rspam-User: X-HE-Tag: 1788811044-910318 X-HE-Meta: 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 kI/RqX+2 zNL2ASLXvTHI8XtjFLPtQJnv4/HYOIWw+UYBDRrim3zJrXAyn0KsqCyEZT/gIdxd/21ASln+4+s7SImUeqarxevPvspRfMlGaehAL40NXoheDykTvFZtlmXSF1Q811rXkVqHB1BrPRLgeVdhvIR0Hq4+qRpdEYr8NixLwl7gpwSgE+gcF9kPlfCxKSkiRS4a20xg1meOgAOSp3OK0rnauOLy+0bSVCpL7aXbuAjOIcDbjVJ2ddUOhHbHplA90xBVcUTqZtLAu2gvbyBq63EBAG4myJGW4JgLLJqmtqJUuVj8dNQrCEQKHMe/FEUA31S6BMrgB2ocapjyTncM= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/7/26 20:33, Kiryl Shutsemau wrote: > From: "Kiryl Shutsemau (Meta)" > > __folio_unqueue_deferred_split() and __folio_freeze_and_split_unmapped() > both clear PG_partially_mapped and take the folio out of > MTHP_STAT_NR_ANON_PARTIALLY_MAPPED with the same five lines. > > Move the block into folio_reset_partially_mapped() and call it from both > places. > > The helper asserts what both callers rely on: the folio is frozen, so > deferred_split_folio() cannot set the flag again under it, and the folio > is already off the deferred split queue. The list check sits behind the > flag test because order-1 folios have no _deferred_list. > > folio_order() is safe to use at this point in the split process: it > still shows the pre-split order. > > Suggested-by: David Hildenbrand (Arm) > Assisted-by: Claude-Code:claude-fable-5-1 > Signed-off-by: Kiryl Shutsemau (Meta) Thanks! Acked-by: David Hildenbrand (Arm) -- Cheers, David