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b=13YXjGm8umxmJamt0Zl1nKi6FNc3yziP/vjSEGG91+vsNi4OogHLRxY7Os18riT6j xSB1wtQTgLsp2E+D4CjtXNYBRWoJb6FbDoLA75BqLwuEZ73BxJni5ECzExUPT4C57K NjFDS57rLQ2ZgcD+FsaZEXwed9MX9I3E9DrRSicA= Date: Thu, 22 Jan 2026 13:28:07 -0800 From: Andrew Morton To: Cui Chao Cc: dan.j.williams@intel.com, Jonathan Cameron , Mike Rapoport , Wang Yinfeng , linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2 1/1] mm: numa_memblks: Identify the accurate NUMA ID of CFMW Message-Id: <20260122132807.7204b83e97e33290f6eb7d82@linux-foundation.org> In-Reply-To: <2d1e23ad-7ec1-483b-88b3-70ce19b69106@phytium.com.cn> References: <20260106031042.1606729-1-cuichao1753@phytium.com.cn> <20260106031042.1606729-2-cuichao1753@phytium.com.cn> <20260108094812.8757ce3ad8370668eaafb29c@linux-foundation.org> <9132054c-3017-4af0-84e0-e4359b0794a6@phytium.com.cn> <20260115101858.85fd7b8e837c1c92a4fdc5f0@linux-foundation.org> <696944eca1837_34d2a10056@dwillia2-mobl4.notmuch> <2d1e23ad-7ec1-483b-88b3-70ce19b69106@phytium.com.cn> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 82DD7A0006 X-Stat-Signature: pxcyfr5mdkwjfb94fge3nzdkynoqni4o X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1769117289-300045 X-HE-Meta: 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 Qfm9Jbc0 KG1of4ZPx7D9iKFUTq1et0VO9G4gQ+EHOf9LuAQFvdY0QIPABneyconMFdxek1oDpGoARKvfFECmxZx0CdmgdQeCRBIFhqiPjDNWWrH9oQB5Cq9CmuhHIe0dJWe5avbICNA93mUU75R8foIeFkQ3ilyUpHA98Pc7jF8c4xxSmPoF6bEGAGlzjEVOOV1h/WWLq3UXwGv3Y2rahxMcgSuLX/fCRB+c7I0SDm+AOwLt4Ye8Kj0X2HIxVkbzq9EE29x/Y2bFny8Sm39tfjCGD67FsasEOSmGmickv+uVIozfelzpQy5cesYvX6X9UrtZYx9uJ+BRh/FKE+wOtQeOQ0vyKQQO9Yy3Fpp1Jpn3r X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, 22 Jan 2026 16:03:49 +0800 Cui Chao wrote: > > >> So please, tell us how much our users are hurting from this and please > >> make a recommendation on the backporting decision. > >> > > To add on here, Cui, please describe which shipping hardware platforms > > in the wild create physical address maps like this. For example, if this > > is something that only occurs in QEMU configurations or similar, then > > the urgency is low and it is debatable if Linux should even worry about > > fixing it. > > > > I know that x86 platforms typically do not do this. It is also > > within the realm of possibility for platform firmware to fix. So in > > addition to platform impact please also clarify why folks can not just > > ask for a firmware update to get this fixed without updating their > > kernel. > > Andrew, Dan, thank you for your review. > > 1.Issue Impact and Backport Recommendation: > > ... > > Thus, I believe a kernel fix is necessary. Thanks, I posted all that into the changelog. > Therefore, I recommend backporting this patch to all stable kernel > series that support dynamic CXL region creation. It's helpful if we can tell -stable maintainers which kernel versions "support dynamic CXL region creation". We communicate that by providing a Fixes: tag in the changelog. Are you able to help identify a suitable commit for this?