From mboxrd@z Thu Jan 1 00:00:00 1970 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 03956257AF4; Fri, 25 Apr 2025 14:18:12 +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=1745590695; cv=none; b=qU0mcwjqeNuic1H7DpVRV5kuFLsiy1yc5kp7MgPFXZDU986gicHKqUwpvDEbjplZtWBSWXWbaCEbkJTGorS/2usrF01u0NugRQkXeKXduM9SCUbC3kL5/3lhfmPAJkvmTFCSsglPPi8ah8OKUhhQnx5TJ+G7v96KA7M29m/X9u0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745590695; c=relaxed/simple; bh=xVZTr+urseR/5MDw4lyGLG5xGzmOYyAcw5w4WvIr3vw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=iaUA3MpiDwtYlY6X+UE1pxREDuxdyXjDcsvud+D1EEkkkubP1WN42Bc7DwUzzUGKY+T+cpb2oM3sOPLKmd/tGbYwsY/TQNf2iogMhHO73eLptMQXYbNjpERwpBRig1MFuWnp6qaLehRs10bhhZ+bqlcDOD3VH+5cjofYY44W92Y= 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=cZFwnrnb; 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="cZFwnrnb" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=D2sw/hcVuZRtIbJVka/uPT4xRYSxoea9Y+E1vPOTyXc=; b=cZFwnrnb0lFb1zYmx8iyeE9plr 4MB2JMF9vyy0yk9l0RkimFF6XpX69AWyHX8MNeeWvRHP71EsWaNnlPDvIsfFoQ+ppHy+M6U3uCuIW hUF82b9os0zG2WIRq5KPMpyf5bO8LI6/xwkvJRR1wvcalAvRtjEvnU+oqr3CCjwalgVw9uwXDk0Mv PZGC0YVFL/gKl0v2A7vck1X7CJ4Z8p9ny/E0iqqrPE1kYL05VWfAtFoD26DmpPV62cE7I+khovMSl hAtPV9nyit+1ckZr8qg0kcN/uIhFYP/iwCAlweTr4NofMG19kq5T8um3tGn9eDFBQ77ALPMJTtPwq t2FFfRxw==; Received: from [172.31.31.140] (helo=u09cd745991455d.ant.amazon.com) by desiato.infradead.org with esmtpsa (Exim 4.98.1 #2 (Red Hat Linux)) id 1u8JsV-0000000C3yw-3Ozd; Fri, 25 Apr 2025 14:18:07 +0000 Message-ID: <16911666479b2fe4bc65944605199a8b3f12e875.camel@infradead.org> Subject: Re: [PATCH] mm: memblock: Fix arguments passed to memblock_set_node() From: David Woodhouse To: "Bernardo C. Gutierrez Cantu" Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lkp@intel.com, rppt@kernel.org, yajun.deng@linux.dev, Huang Pei , Thomas Bogendoerfer , Huacai Chen , Jiaxun Yang , linux-mips Date: Fri, 25 Apr 2025 15:18:07 +0100 In-Reply-To: <20250425102003.64122-1-bercantu@amazon.de> References: <20250425102003.64122-1-bercantu@amazon.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-8C2F5QNVboy8+d1BlNFD" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html --=-8C2F5QNVboy8+d1BlNFD Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2025-04-25 at 10:20 +0000, Bernardo C. Gutierrez Cantu wrote: > memblock_set_node() receives a `base` and a `size` arguments, but we are > passing the `start` and `end` of the memory regions when iterating over > them in memmap_init_reserved_pages() to set their node ids. >=20 > This results in the function setting the node ids for the reserved memory > regions in `[base, base + base + size)` instead of `[base, base + size)`. >=20 > Pass `start` and `size`, so that we iterate over the correct range. >=20 > Fixes: 61167ad5fecd ("mm: pass nid to reserve_bootmem_region()") >=20 > Signed-off-by: Bernardo C. Gutierrez Cantu Thanks, Bernardo. Good catch! Acked-by: David Woodhouse That function taking (start, size) arguments seems a little surprising to me; I instinctively expect physical memory management functions to use (start, end). Clearly the author of that commit did too :) As you pointed out in our private chat though, the rest of the memblock_* functions are all (start, size) too, so they are at least consistent. I don't think it makes a lot of sense to talk about changing them *all* at this point? I did a quick grep for memblock_set_node() callers, and the one in szmem() in arch/mips/loongson64/init.c looks odd. /* set nid for reserved memory */ memblock_set_node((u64)node << 44, (u64)(node + 1) << 44, &memblock.reserved, node); At first glance I suspect the 'size' should just be (1<<44) or maybe it should be inside the loop over the memmap, and called with mem_start, mem_size each time? And why are we calling memblock_reserve() for what appears to be a single system-wide vgabios_addr, repeatedly each time szmem() is called for a different NUMA node? --=-8C2F5QNVboy8+d1BlNFD Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 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