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Fri, 13 Feb 2026 17:31:18 +0000 Date: Fri, 13 Feb 2026 09:31:09 -0800 From: Alison Schofield To: "Yasunori Goto (Fujitsu)" CC: "Tomasz Wolski (Fujitsu)" , "Smita.KoralahalliChannabasappa@amd.com" , "ardb@kernel.org" , "benjamin.cheatham@amd.com" , "bp@alien8.de" , "dan.j.williams@intel.com" , "dave.jiang@intel.com" , "dave@stgolabs.net" , "gregkh@linuxfoundation.org" , "huang.ying.caritas@gmail.com" , "ira.weiny@intel.com" , "jack@suse.cz" , "jeff.johnson@oss.qualcomm.com" , "jonathan.cameron@huawei.com" , "len.brown@intel.com" , "linux-cxl@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-pm@vger.kernel.org" , "Zhijian Li (Fujitsu)" , "ming.li@zohomail.com" , "nathan.fontenot@amd.com" , "nvdimm@lists.linux.dev" , "pavel@kernel.org" , "peterz@infradead.org" , "rafael@kernel.org" , "rrichter@amd.com" , "terry.bowman@amd.com" , "vishal.l.verma@intel.com" , "willy@infradead.org" , "Xingtao Yao (Fujitsu)" , "yazen.ghannam@amd.com" Subject: Re: [PATCH v6 0/9] dax/hmem, cxl: Coordinate Soft Reserved handling with CXL and HMEM Message-ID: References: <20260212144415.10418-1-tomasz.wolski@fujitsu.com> Content-Type: text/plain; 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Maybe I'm misunderstanding Tomasz's Case 1), because this is not a work-around for a firmware issue. The CXL driver always tries to create DAX regions out of RAM regions. That happens if the CXL region is BIOS defined 'auto' region or a region requested via userspace. That is irregardless of Soft Reserved existence. Soft-Reserved is not a requirement for CXL or DAX region creation. That piece broke in an earlier rev of this patchset [1] where the calls to devm_cxl_add_dax_region(cxlr) started returning EPROBE_DEFER. I intended to point out to Smita, that behavior is restored in v6. --Alison [1] https://lore.kernel.org/linux-cxl/aXMWzC8zf3bqIHJ0@aschofie-mobl2.lan/ > > Thanks, > --- > Yasunori Goto > >