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[80.230.25.21]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4891df9e50asm153245945e9.0.2026.04.21.15.01.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 15:01:18 -0700 (PDT) Date: Tue, 21 Apr 2026 18:01:16 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: Andrew Morton , David Hildenbrand , Vlastimil Babka , Brendan Jackman , Michal Hocko , Suren Baghdasaryan , Jason Wang , Andrea Arcangeli , Gregory Price , linux-mm@kvack.org, virtualization@lists.linux.dev, Lorenzo Stoakes , "Liam R. Howlett" , Mike Rapoport Subject: [PATCH RFC v3 02/19] mm: add folio_zero_user stub for configs without THP/HUGETLBFS Message-ID: <2c8e630afa8b68232d648c08eec4b2fc7d933dc1.1776808210.git.mst@redhat.com> References: MIME-Version: 1.0 In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: Pk-G2je0K52DsQihnDMY9AO18daDC-xY9xatv9FZpQw_1776808880 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: BF74D180003 X-Stat-Signature: j9e9o1jutf59cb47dgjpjbe1oqpxwiri X-HE-Tag: 1776808882-820141 X-HE-Meta: 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 uUjtky9Z cFdRW+J2OvR4CGTdeTFnxbPA0cSsgsVLAK8M6ss8zVinPc8tT22Y4UYfonMDP0m9ItFi82x41+vIloTCd9gpRc6UFlU7wxnyLtCdvueSTKIUp2VuI7o7jUSkvIX3HA3wH1d46zvdU4PQS4u9iBpxa3rXf1duZawGfBy9jVJfixBCL9zqpw2x/PCCruLQEW7rbMREivUAs/khVObKsfjk47FFtnBiE/IP4xRxJk1q4uTPycYT4WeI+t6kNVpNfF4IUHlCPa0+dKURIYfmhOvFITurx+7Km/ATNDmHmjzHg+trzoY3zapR5eUY718Od7JIakQJhCI3yGrvNPVf09Iv35RPALc/Fb6VY65NsRTaJwBKtSYNjJ+zzJIcvWxdKkpcaWv7Xjan+zFcLOyCHhAaPuzXKUw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: folio_zero_user() is defined in mm/memory.c under CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS. A subsequent patch will call it from post_alloc_hook() for all user page zeroing, so configs without THP or HUGETLBFS will need a stub. Add a macro in the #else branch that falls back to clear_user_highpages(), which handles cache aliasing correctly on VIPT architectures and is always available via highmem.h. Without THP/HUGETLBFS, only order-0 user pages are allocated, so the locality optimization in the real folio_zero_user() (zero near the faulting address last) is not needed. Signed-off-by: Michael S. Tsirkin Assisted-by: Claude:claude-opus-4-6 Assisted-by: cursor-agent:GPT-5.4-xhigh --- include/linux/mm.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 5be3d8a8f806..541d36e5e420 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4718,6 +4718,9 @@ static inline bool vma_is_special_huge(const struct vm_area_struct *vma) (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))); } +#else /* !CONFIG_TRANSPARENT_HUGEPAGE && !CONFIG_HUGETLBFS */ +#define folio_zero_user(folio, addr_hint) \ + clear_user_highpages(&(folio)->page, (addr_hint), folio_nr_pages(folio)) #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ #if MAX_NUMNODES > 1 -- MST