From nobody Fri Dec 19 17:14:43 2025 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 93F2327934C for ; Wed, 23 Apr 2025 08:18:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745396330; cv=none; b=aFkAGJfj+EwFoBXkaEgS1PifPcgTD9QSK0JQIqeI3k0lxu3+HN+Zq0RMquB8W01WcEYcQ5eGxKHEedNfQeJ6sM/KBSbr369w4ZF+mslb4P/2/A+6rFkaDRwU+/f2cKtbYKzF2DeYw4UcYCBLaiIuqTlM4gzy8m3q20mixq7sqD8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745396330; c=relaxed/simple; bh=aJSyZUbvYgHKXNphFjQQ6yb4qY9ldldBA5b5a4XSOsE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OM3B2ZDZB9jhzlaCcGt7mokdjCDhLJGCgxjgc2WPxMZqUvlyQQVNmqVrskYl3h6L/07rWjsa0Dl96rE4tSVh0MkKHqeKdqEdQhqmTOLxvz1ztd2lyxrVRhbcnBJqvup0LR2X2e/acZ5zjy16yZPgNR1aIwDF3sZeh8ML0ySmI9o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=bzRNUMuC; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="bzRNUMuC" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=X8ymBgUSA5ZN0KXL1mRdo7aKval8NgY94GI7dvST/r4=; b=bzRNUMuChOzbFAH8S7qC9tNmhC CIlHhZ7LuV418WmWzA7dWK7LtPbTHUO5x+uwHyVe0fBqEluh74Bj2oF8f9nV3ZGMyXsLqCzSh7nM+ 5XzAGnmgdqk1NUpe1dztvjf4ruAkXFrvZ92PhGQiS9AXOcfLT91vOWRIscbdVaAKCBpmWjk6u0zYG 2Pq7RHsR2aXU4piqfHOSQqnqzU/zswY0gynnv7WGJYItq0WD1AeVoBVArXIhO/3Ph8ZKnG7yLlePa sr0gFSgo1A7Ty/QUAfGAVZmtCEvnZwo6H8NEaGOwYwXyBYZcd0HzoFEox1hJoGvF7DfhDt92xgdM4 CKV4ZNIA==; Received: from [2001:8b0:10b:1::ebe] (helo=i7.infradead.org) by desiato.infradead.org with esmtpsa (Exim 4.98.1 #2 (Red Hat Linux)) id 1u7VJR-0000000BOie-1aho; Wed, 23 Apr 2025 08:18:33 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.98.1 #2 (Red Hat Linux)) id 1u7VJO-00000002YNq-1401; Wed, 23 Apr 2025 09:18:30 +0100 From: David Woodhouse To: Mike Rapoport Cc: Andrew Morton , "Sauerwein, David" , Anshuman Khandual , Ard Biesheuvel , Catalin Marinas , David Hildenbrand , Marc Zyngier , Mark Rutland , Mike Rapoport , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Ruihan Li Subject: [PATCH v3 2/7] mm: Implement for_each_valid_pfn() for CONFIG_FLATMEM Date: Wed, 23 Apr 2025 08:52:44 +0100 Message-ID: <20250423081828.608422-3-dwmw2@infradead.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250423081828.608422-1-dwmw2@infradead.org> References: <20250423081828.608422-1-dwmw2@infradead.org> 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 Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html Content-Type: text/plain; charset="utf-8" From: David Woodhouse In the FLATMEM case, the default pfn_valid() just checks that the PFN is within the range [ ARCH_PFN_OFFSET .. ARCH_PFN_OFFSET + max_mapnr ). The for_each_valid_pfn() function can therefore be a simple for() loop using those as min/max respectively. Signed-off-by: David Woodhouse Reviewed-by: Mike Rapoport (Microsoft) --- include/asm-generic/memory_model.h | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memor= y_model.h index a3b5029aebbd..74d0077cc5fa 100644 --- a/include/asm-generic/memory_model.h +++ b/include/asm-generic/memory_model.h @@ -30,7 +30,15 @@ static inline int pfn_valid(unsigned long pfn) return pfn >=3D pfn_offset && (pfn - pfn_offset) < max_mapnr; } #define pfn_valid pfn_valid -#endif + +#ifndef for_each_valid_pfn +#define for_each_valid_pfn(pfn, start_pfn, end_pfn) \ + for ((pfn) =3D max_t(unsigned long, (start_pfn), ARCH_PFN_OFFSET); \ + (pfn) < min_t(unsigned long, (end_pfn), \ + ARCH_PFN_OFFSET + max_mapnr); \ + (pfn)++) +#endif /* for_each_valid_pfn */ +#endif /* valid_pfn */ =20 #elif defined(CONFIG_SPARSEMEM_VMEMMAP) =20 --=20 2.49.0