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([110.9.142.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d0aa4d67dcsm9219905ad.70.2026.08.04.08.12.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Aug 2026 08:12:33 -0700 (PDT) From: Sang-Heon Jeon To: Andrew Morton , David Hildenbrand Cc: "Liam R. Howlett" , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , Zi Yan Subject: [PATCH v2 1/2] mm/Kconfig: make FLATMEM depend on !NUMA Date: Wed, 5 Aug 2026 00:11:41 +0900 Message-ID: <20260804151145.3419768-2-ekffu200098@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260804151145.3419768-1-ekffu200098@gmail.com> References: <20260804151145.3419768-1-ekffu200098@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" FLATMEM + NUMA is not supported by any architecture and fails to build. The constraint is only implicit in the arch Kconfig files. So make it explicit in mm/Kconfig. No functional change. Suggested-by: Zi Yan Signed-off-by: Sang-Heon Jeon Acked-by: David Hildenbrand (Arm) Acked-by: Mike Rapoport (Microsoft) Acked-by: Zi Yan --- mm/Kconfig | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/Kconfig b/mm/Kconfig index 060190e12bce..331daf7fcfab 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -390,6 +390,7 @@ choice =20 config FLATMEM_MANUAL bool "Flat Memory" + depends on !NUMA depends on !ARCH_SPARSEMEM_ENABLE || ARCH_FLATMEM_ENABLE help This option is best suited for non-NUMA systems with @@ -424,6 +425,7 @@ config SPARSEMEM =20 config FLATMEM def_bool y + depends on !NUMA depends on !SPARSEMEM || FLATMEM_MANUAL =20 # --=20 2.43.0 From nobody Fri Oct 2 06:16:34 2026 Received: from mail-pj1-f52.google.com (mail-pj1-f52.google.com [209.85.216.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9F26245DF4D for ; Tue, 4 Aug 2026 15:12:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.52 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785856358; cv=none; b=EhCbqk/LZIsYFRc6SdPPkuOi36GbHIoDHJWkeyKSTSlJUx862VhfY1x4UuoNCj8YYYyAHPpLu1edVWfYrO01py270PK7z1krnXsWv9GcwkMIDZ9AwzXW+GERWgmSECbucku0U8g794KrrQCTuqP0dGEV9YfLmUy+61mgbk4cEfI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785856358; c=relaxed/simple; bh=K+2+gwKZK9OFXT5jwCa4FlTykExVllVc5FTOkcrcfe4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ux1DShqhm5P3UwpGnyvnHb/6TVYWeO8MkFIHJ9xowE4vqXYmMMt4ZBkvPE/K0bKaBVVHgscUWKA+7R+30pop7iLOMjAhbriG815FujDg2tSQJiFXE5rJ32HGxhiLeVmBQJWiwRDt0Biopxx0j+6koyRe2YfTvpOCzjFKhPTmyVw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=a2hng3zw; arc=none smtp.client-ip=209.85.216.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="a2hng3zw" Received: by mail-pj1-f52.google.com with SMTP id 98e67ed59e1d1-38fdeaed181so2265374a91.1 for ; Tue, 04 Aug 2026 08:12:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1785856357; x=1786461157; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=m+EEI8OmXFAV5iwPGEDdFyR14Opwttq92Jr4Rn38Aqo=; b=a2hng3zwrjIw7ET7f8RWcaZ8lONsMlGZHeukkqxend4ILM+Zbwnd74YYvkXjQ5NqlZ P7680i8klVcXurH7sijdkZVJ8tyMKzpGVyW9QpNoVbWZsZ57ySdIM38MkulcKSVhS5mN 4/xEOH0n7eTskmHBjUQ23zUBil40Ym2o/iTzP6FisXSve9aqjRG8bcpbnBpcn/dpZyd6 BxDsu15VZGLpe1ETPi06Rza7XLmbxVX+lcc05NpM5NLMYNLIfOBorcHfebA/jK+6gsNy npyoqF9xibNSpPmYjuaIfPSfwN/k0udKF2vduHZY2jcN+XFTLyUrPluxyE0N3LmdYsqv NLAg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785856357; x=1786461157; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=m+EEI8OmXFAV5iwPGEDdFyR14Opwttq92Jr4Rn38Aqo=; b=UiP4Q8AW4wu8pU+LRgoacjxiKJwAkjAOnjJfkjdXfiOP07219vPeBJvnhvRklNouyF r6REBkragwosavOz4UD+9zF9lUHK4A5pTOVoozLGVrwxyFOpmOV8P/SxCFKblolnOWMk 7Fn0MdIzjd5YlR5wEkhu9sGxdDzjKQdF4+SjA6eZkhMRSXN9S9IPCkBkrRtKzcz2yTRN anarNmTmC3i70zIrlisLoPBPA+Mg072SLfKrXSl2+yZjksQAhJqDgn10HBwAqZO4jgld 4pvlZw0FA+C+JOzJ+/6SNkPjk/cRN/CCTqOjbizWVC74a3jf4a4Gl8uETqWVS7VVRMlK 0SKg== X-Forwarded-Encrypted: i=1; AHgh+Rq28ND3VljLBVT73HAdChpAL5Jg2PAKahm522ar0zjffbLj5uCZd+v51Bxm09KWEk1hxnqIrTPRweFFMm0=@vger.kernel.org X-Gm-Message-State: AOJu0Yx1mEfk3i4oSJvVHtacwfyQK3GlCxpDukOhWcN+3jFrpu3lifa2 oWbyDIaNtHpflZwYqkqYXGsu4wSwv5QyQgZvK0CQlQ0xew3uaN+KlRzf X-Gm-Gg: AR+sD13tDfJFFnBmSqjN3RymxVmuLZE09BdpEfCI0ZKhjDFxy6Mbb9mnNLUjTskIrIJ /TsL6iqhGc4raVHvIxHd6nNzvqsRu71iQya8eICEVEP6OQiQh9m4ZjBZlDQZXMUV0Dd9eR8m7cW fl+LdpDOW2cPiXWCh3df1sMGslKHa41LhX+XEF3MYA+7RXyqhcvIvLDxiI2f9gRPZlV8KMrb7+3 VKdbo/9odIeeonTMWZJCK55RbK/wis8oZtPJiWUyjpn0N2VkQQEobH68PtwpkGcit8uBWFo2b0J BKQlael/IxTWcZVW0CF0yYRq9yl0ovZ6OSrcMnAUQotk9FBH/SrQAqzzyS6B9RtwhGF+5P0jTua gVy7NQcZdW0qVGNb6PhlRJPhxip1mNZ68Ps6D0T57cveLkxVt5VFTXIhjfcHb+1Q1mYkOX+a027 tl2F8i4AYGUuUMsv+OnBFog3yI0+Sg+ZEWQO0F0LrtFSdpsgnadVHrA5I= X-Received: by 2002:a17:902:e5c1:b0:2c9:d298:6c06 with SMTP id d9443c01a7336-2d0523fa272mr147650405ad.25.1785856356894; Tue, 04 Aug 2026 08:12:36 -0700 (PDT) Received: from ubuntu.. ([110.9.142.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d0aa4d67dcsm9219905ad.70.2026.08.04.08.12.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Aug 2026 08:12:36 -0700 (PDT) From: Sang-Heon Jeon To: Andrew Morton , David Hildenbrand , Mike Rapoport , Vlastimil Babka Cc: Brendan Jackman , Johannes Weiner , "Liam R. Howlett" , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Lorenzo Stoakes , Michal Hocko , Suren Baghdasaryan , Zi Yan Subject: [PATCH v2 2/2] mm/page_ext: remove pgdat_page_ext_init() Date: Wed, 5 Aug 2026 00:11:42 +0900 Message-ID: <20260804151145.3419768-3-ekffu200098@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260804151145.3419768-1-ekffu200098@gmail.com> References: <20260804151145.3419768-1-ekffu200098@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" pgdat_page_ext_init() sets pgdat->node_page_ext to NULL only on FLATMEM. FLATMEM depends on !NUMA, so the pgdat is always the zero-initialized contig_page_data and the store has no effect. So remove the call site, the unused function and its declaration. No functional change. Signed-off-by: Sang-Heon Jeon Acked-by: David Hildenbrand (Arm) Acked-by: Zi Yan --- include/linux/page_ext.h | 5 ----- mm/mm_init.c | 1 - mm/page_ext.c | 9 --------- 3 files changed, 15 deletions(-) diff --git a/include/linux/page_ext.h b/include/linux/page_ext.h index f23d4b218da0..79c53ec45dfa 100644 --- a/include/linux/page_ext.h +++ b/include/linux/page_ext.h @@ -55,7 +55,6 @@ struct page_ext { =20 extern bool early_page_ext; extern unsigned long page_ext_size; -extern void pgdat_page_ext_init(struct pglist_data *pgdat); =20 static inline bool early_page_ext_enabled(void) { @@ -202,10 +201,6 @@ static inline bool early_page_ext_enabled(void) return false; } =20 -static inline void pgdat_page_ext_init(struct pglist_data *pgdat) -{ -} - static inline void page_ext_init(void) { } diff --git a/mm/mm_init.c b/mm/mm_init.c index 711f821f7b3c..e9c4204b73ad 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -1394,7 +1394,6 @@ static void __meminit pgdat_init_internals(struct pgl= ist_data *pgdat) for (i =3D 0; i < NR_VMSCAN_THROTTLE; i++) init_waitqueue_head(&pgdat->reclaim_wait[i]); =20 - pgdat_page_ext_init(pgdat); lruvec_init(&pgdat->__lruvec); } =20 diff --git a/mm/page_ext.c b/mm/page_ext.c index e2e92bd27ebd..b679a8c1f7d7 100644 --- a/mm/page_ext.c +++ b/mm/page_ext.c @@ -164,11 +164,6 @@ void __init page_ext_init_flatmem_late(void) invoke_init_callbacks(); } =20 -void __meminit pgdat_page_ext_init(struct pglist_data *pgdat) -{ - pgdat->node_page_ext =3D NULL; -} - static struct page_ext *lookup_page_ext(const struct page *page) { unsigned long pfn =3D page_to_pfn(page); @@ -494,10 +489,6 @@ void __init page_ext_init(void) panic("Out of memory"); } =20 -void __meminit pgdat_page_ext_init(struct pglist_data *pgdat) -{ -} - #endif =20 /** --=20 2.43.0