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[80.230.48.7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45416b5e3fesm1973208f8f.19.2026.05.07.15.22.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 May 2026 15:22:36 -0700 (PDT) Date: Thu, 7 May 2026 18:22:34 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org Subject: [PATCH v5 03/28] mm: add folio_zero_user stub for configs without THP/HUGETLBFS Message-ID: 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: 7EOo6xcMd-JzRy4eVEN-eSw0CzLFyz1gIvD3fQHD844_1778192558 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 2B9C540007 X-Stat-Signature: 3mfdi5ds9k3cyuby17cg5qufzicdjonr X-HE-Tag: 1778192561-641776 X-HE-Meta: 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 AG2HPblW M3nrGaJN2uLKQxyXc9Ewv+9iPJmnxny3JS7ED93mxowzvMwZljGViRCdFNHzBU4BTny8fMrw1TCim/3O16fYnWk1kCZ7TPzMHxDvny7gaGlARNDhiU55riukd3XLTvW1jZRS+LKBcDVm3ZG58tRzSR+bHOVhf3Kg71dA5PtstLcsjSnHa9QPw30cF1MFcN+k4+xK9jNymQnj+D4qEcg2UU/QaRiDUcVu2KmiBH+KTg2sMJ/DkrlDs5UtqNRtQt2SItwsaBe4AWNCk4N0mt1IapLe2D57fVkHuiNONyzlEZXTWTmS/As3oiEgwZy4fqBQ09NeVXUkHCe3rvMU3zUpTtSYYAAJqTyq9a83CbeVFbflQeaJlW0Gv9XQA8wR6VaAZUraODC0z/pxlRcG0Z+4EJ7BbQw== 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. This also matches what vma_alloc_zeroed_movable_folio currently does. 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