From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0F7E650279A for ; Wed, 30 Sep 2026 18:40:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790793611; cv=none; b=eWezFiDr0yjbHEh+8YfIB7J/BomC0eTJ2aeeuYTHLq1gaRAHyc1uZVVtTdIeX+eWZwXRKyNnkgJFpCNQOE6eThak6XGK+R9Eb+plAMkg7vScg9uJI+F+BDi/uYRpFJLOzeg+JBSGO8AVRaeZv2rYjWNbUrzzP3PHSuuNZ4cEV+A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790793611; c=relaxed/simple; bh=UtRZr5I6mwR7+3Hm9P6wJXVcdNXghUuiA0m2eru5EKk=; h=Date:To:From:Subject:Message-Id; b=DaWQAscy7gQDgsXZ3Wv+WCBoGNfN0sypJLJb0e3Rvjsagqa/5ogq0Tg74V6IFDjU6c+JgFGLxpohCAFW3qdze09aanNjoKl1kUOGgytTy1bcSrMwvBt1Hgs+V3b9OCSJLdj08xawne4NOHoOoo5oEytcTEN2+7MD6gTNrUSJB78= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=HAXD2Lf5; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="HAXD2Lf5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C96301F000FF; Wed, 30 Sep 2026 18:40:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1790793609; bh=k5wjR/OXPdKctON3hLsTKhOAu0LGTe6Yz0pFcXtlhb8=; h=Date:To:From:Subject; b=HAXD2Lf5zEjnUlIaXRmd4QVcOAbvJ/CvMgoQqFEtcCa5yZ4A/09pY3D6TmBfWsUY5 D+P5SNSsLRAcoYA6zaUDrtnaLH+WExAGv3emA53Vyv15JHao0YpmqyzK/f/xpDCB6f 2aaxBwLGutLioF2q8Eo58sukbXxndUGxVkC433S0= Date: Wed, 30 Sep 2026 11:40:09 -0700 To: mm-commits@vger.kernel.org,muchun.song@linux.dev,akpm@linux-foundation.org From: Andrew Morton Subject: [to-be-updated] mm-sparse-vmemmap-open-code-init_compound_tail.patch removed from -mm tree Message-Id: <20260930184009.C96301F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/sparse-vmemmap: open-code init_compound_tail() has been removed from the -mm tree. Its filename was mm-sparse-vmemmap-open-code-init_compound_tail.patch This patch was dropped because an updated version will be issued ------------------------------------------------------ From: Muchun Song Subject: mm/sparse-vmemmap: open-code init_compound_tail() Date: Sun, 27 Sep 2026 10:54:33 +0800 init_compound_tail() is only used by vmemmap_shared_tail_page(), where the shared tail page setup intentionally passes NULL as the compound head. Keeping this helper in mm/internal.h exposes that special case to the rest of the MM code and can make the NULL head argument look generally valid. Open-code the initialization at the only call site so the special-case use stays local to sparse vmemmap optimization. No functional change intended. Link: https://lore.kernel.org/20260927025441.741633-5-songmuchun@bytedance.com Signed-off-by: Muchun Song Signed-off-by: Andrew Morton Acked-by: Qi Zheng Acked-by: David Hildenbrand (Arm) Acked-by: Mike Rapoport (Microsoft) Cc: Oscar Salvador Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Jonathan Corbet Cc: Lorenzo Stoakes Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Randy Dunlap Cc: Lance Yang --- mm/internal.h | 9 --------- mm/sparse-vmemmap.c | 5 ++++- 2 files changed, 4 insertions(+), 10 deletions(-) --- a/mm/internal.h~mm-sparse-vmemmap-open-code-init_compound_tail +++ a/mm/internal.h @@ -786,15 +786,6 @@ static inline void prep_compound_tail(st VM_WARN_ON_ONCE(tail->private); } -static inline void init_compound_tail(struct page *tail, - const struct page *head, unsigned int order, struct zone *zone) -{ - atomic_set(&tail->_mapcount, -1); - set_page_node(tail, zone_to_nid(zone)); - set_page_zone(tail, zone_idx(zone)); - prep_compound_tail(tail, head, order); -} - #if defined CONFIG_COMPACTION || defined CONFIG_CMA /* --- a/mm/sparse-vmemmap.c~mm-sparse-vmemmap-open-code-init_compound_tail +++ a/mm/sparse-vmemmap.c @@ -217,7 +217,10 @@ struct page __ref *vmemmap_shared_tail_p for (int i = 0; i < PAGE_SIZE / sizeof(struct page); i++) { page = (struct page *)addr + i; mm_zero_struct_page(page); - init_compound_tail(page, NULL, order, zone); + atomic_set(&page->_mapcount, -1); + set_page_node(page, zone_to_nid(zone)); + set_page_zone(page, zone_idx(zone)); + prep_compound_tail(page, NULL, order); } page = virt_to_page(addr); _ Patches currently in -mm which might be from muchun.song@linux.dev are mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch mm-sparse-vmemmap-set-compound-page-order-for-device-dax.patch mm-sparse-vmemmap-switch-device-dax-to-shared-tail-vmemmap-pages.patch mm-sparse-vmemmap-switch-device-dax-to-shared-tail-vmemmap-pages-fix.patch mm-sparse-vmemmap-move-vmemmap-optimization-helpers-to-a-public-header.patch powerpc-mm-switch-device-dax-to-shared-tail-vmemmap-pages.patch mm-sparse-vmemmap-drop-the-extra-tail-page-from-device-dax-reservation.patch mm-sparse-vmemmap-drop-unused-section_nr_vmemmap_pages-arguments.patch documentation-mm-update-dax-vmemmap-deduplication-docs.patch mm-sparse-vmemmap-drop-vmemmap_populate_dax.patch mm-sparse-vmemmap-support-device-dax-in-common-vmemmap-path.patch mm-sparse-vmemmap-drop-device-dax-specific-population-path.patch mm-sparse-vmemmap-remove-the-unused-ptpfn-argument.patch mm-sparse-vmemmap-open-code-vmemmap_populate_address.patch mm-mm_init-add-zone-mismatch-warning-during-page-init.patch