From nobody Fri Dec 19 00:16:40 2025 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 53A0518FC91 for ; Wed, 23 Apr 2025 13:38:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745415512; cv=none; b=uNkyxj/LjGGgjwUnYbx/rQg/4+6bcoWbiMV56eeT29ktJhNztWoXTzgK7i+oCwe34XEilBH4/MgTGGp3I9t37TCd+ZmL1AvDreaq7qClxRZ/ItHvfF1aiN0HdQFUf88KfFycDfToDQ8brQ5D+UyGLmT068HcIgT+fYG3cvSB/X0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745415512; c=relaxed/simple; bh=aJSyZUbvYgHKXNphFjQQ6yb4qY9ldldBA5b5a4XSOsE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XsZEyDPoq7lCSF+S2xDOpcGUB3/VZPMj7rnKvyAc4SP1zJLdI/A9OzfaY7Psx4aKGntufm8e2hPTdOd70sT9lk8dT54kcKAZ2n2vmjBBB/g1As+X5WabFUrPQjRCgObsBad+QSwr1qinc7a0L7YkszUZU78CwOXhlvmtsAmbxKY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=uW58jtRq; arc=none smtp.client-ip=90.155.50.34 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=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="uW58jtRq" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=uW58jtRqb9rat/jy8XkoWXi6AM P5hBl1WxKrp7wIkxwfz+6u7NU8jvldTnxq3MoRWuRVIVRPipDpYnUz1mDzIfq3i1QBvampsw2aEwQ I4OxrPjEOuWNCXGVF0jZCkg2UAGOmQSnAvL2XphfzHq2X4K8aOlqPUyyl1hfVjtBX7cVs/aumXtvy jqqPrhjkixIsOz0u2SoFC5F2wMqoSA2j4wbk+EGow/2lwBctZL1ltQRDAhN7sGTYmsUGzkX0a9kmM OIx/37DsAK4P8S1w4p/VCW8r9vTVozBgxF8Z+i4gIBXgypuwJ7hU+0nl5ALm2zd7AOit6GcvxTcPR YbBLCf+A==; Received: from [2001:8b0:10b:1::ebe] (helo=i7.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1u7aIx-000000097Jf-1dtS; Wed, 23 Apr 2025 13:38:23 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.98.1 #2 (Red Hat Linux)) id 1u7aIx-00000003JOg-0b7h; Wed, 23 Apr 2025 14:38:23 +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 , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Ruihan Li Subject: [PATCH v4 2/7] mm: Implement for_each_valid_pfn() for CONFIG_FLATMEM Date: Wed, 23 Apr 2025 14:33:38 +0100 Message-ID: <20250423133821.789413-3-dwmw2@infradead.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250423133821.789413-1-dwmw2@infradead.org> References: <20250423133821.789413-1-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 casper.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) Acked-by: David Hildenbrand --- 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