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 F2135368287; Tue, 9 Jun 2026 10:06:44 +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=1780999606; cv=none; b=TNKzl/fJ8htS+oAR8GG+AspEkzaPqO8OLkJVVUL2WmeXGIMvQ20IOgk5vastaEhpzXZ+WRWz6Hr0rH1Id1arl4l07qii0mMrk5S0shqGQ1Wo1uPBl6kLydWGkdnT2xnXQamVxMJccfdINnzvxRfuc9pZVUYe5F+99AikjkU5n6c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780999606; c=relaxed/simple; bh=6vaEOQWfHt0+Xy+mj8HE6cKKkv5QTIXPQRFdqMKFba4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=HRmMFWKUhlWrcN/Kcur53Tx57vX41l9W5bgrkaJBoKBlBOC2KAaJ4dBoYHq9cWE2FLCRCkadwyiilt8z7LqWJn9g+j+9dB+jkKauxtTuciEC3aaVnbJ6/LNTz40etpfic7Xf0H0g5J54GR5jSLi5PUj/Qj1fbs/6Y2tqH+v1BNI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=f/DNTIH/; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="f/DNTIH/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8AF681F00899; Tue, 9 Jun 2026 10:06:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780999604; bh=1ihPSDA/h0Hov+M03ajn9GoQMpAb1QB0ZzEH18p98fI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=f/DNTIH/yx46ZasoAMnEH1+Guyhpk0JvhSaZTirQQds6faAGBzhYHerjrdgUJJXsL NxG7D2lZanD7LmDxrolbWQwz1dgenNB8N/Sk3ZjzoJtO4qCGocSDl3ka2ajzQwzINO ufSlpY6Mw0IEcUn5oDqsTUaF8tN4YxQX/omJoDv9avZg2Lj5GgPJLD6hYn4LMbVlWS qJpz8NsESC8hOvNFqp6R4rjHENMkwgI54a/ADNU+G/qhYgGo93a+0egI/oPX4EKYS2 wQTSOcY/Hqs6YvPvTydGkejXD076sN7iZsS1Aj3OK7xeY3ZHeOFWVwc1J1o3NMWSbe ZhJct0Cn7Aa9g== Message-ID: Date: Tue, 9 Jun 2026 12:06:38 +0200 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 5/9] mm/memory_hotplug: add multi-range hotunplug To: Gregory Price , linux-mm@kvack.org, nvdimm@lists.linux.dev Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, linux-cxl@vger.kernel.org, linux-kselftest@vger.kernel.org, djbw@kernel.org, vishal.l.verma@intel.com, dave.jiang@intel.com, akpm@linux-foundation.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, osalvador@suse.de, shuah@kernel.org, alison.schofield@intel.com, Smita.KoralahalliChannabasappa@amd.com, ira.weiny@intel.com, apopple@nvidia.com References: <20260605211911.2160954-1-gourry@gourry.net> <20260605211911.2160954-6-gourry@gourry.net> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit > EXPORT_SYMBOL_GPL(offline_and_remove_memory); > + > +/** > + * offline_and_remove_memory_ranges - offline and remove multiple memory ranges > + * @ranges: array of physical address ranges to offline and remove > + * @nr_ranges: number of entries in @ranges > + * > + * Offline and remove several memory ranges as one operation, serialized > + * against other hotplug operations by a single lock_device_hotplug(). > + * > + * Unlike calling offline_and_remove_memory() in a loop, this offlines *all* > + * ranges before removing any of them. If offlining any range fails, the > + * offlining of the ranges processed so far is reverted and nothing is > + * removed, leaving every range online as it was before the call. This gives > + * callers all-or-nothing semantics for the offline step, so a failed unplug > + * does not leave a device split between online and removed ranges. > + * > + * Each range must be memory-block aligned in start and size. > + * > + * Return: 0 on success, negative errno otherwise. On failure no range has > + * been removed. > + */ > +int offline_and_remove_memory_ranges(const struct range *ranges, int nr_ranges) > +{ Is there a way to just generalize the logic in offline_and_remove_memory() to multiple ranges, making offline_and_remove_memory() then a simple wrapper around the new offline_and_remove_memory_ranges(), providing only a single range? -- Cheers, David