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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 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 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 957AB20004 X-Stat-Signature: mbzppbigpon1ojxhibawrn6w7pt464zp X-Rspam-User: X-HE-Tag: 1780999605-141258 X-HE-Meta: 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 hKtyZdA8 zpj973AgnFssZXSeveteenrOWJKc4ebnBSnoSRsTcrWKnTUD2V4PUIIOfw9sVfEzkncP89Nx8mODYCcg/zNOOSI6TtLQv72xD1pfhyrJ3mGzBORdN8pOIkmFNhdtIUNkdd7N46Kl2gelGhI3LteZVlrvCFGyYrUK7LjSaOQRxeKcxDvdTSBMT4c3Dp/tHW5kfGgw58S+5xtXZr38vsYaH/+xMcM83PtgYxuAQ2C+DupA+WSJNRCXGfLxQX4Enf01UiX/CUYNDopr+YNt20c1rFNFySlWebdydYHs3hzo8fzues0EK8xz9M6+sxQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > 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