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Fri, 23 May 2025 05:30:31 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id WC6yMPcHMGh2eQAAD6G6ig (envelope-from ); Fri, 23 May 2025 05:30:31 +0000 Date: Fri, 23 May 2025 07:30:22 +0200 From: Oscar Salvador To: Ge Yang Cc: Muchun Song , akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, 21cnbao@gmail.com, david@redhat.com, baolin.wang@linux.alibaba.com, liuzixing@hygon.cn Subject: Re: [PATCH] mm/hugetlb: fix kernel NULL pointer dereference when replacing free hugetlb folios Message-ID: References: <1747884137-26685-1-git-send-email-yangge1116@126.com> <644FF836-9DC7-42B4-BACE-C433E637B885@linux.dev> <3B8641A1-5345-44A5-B610-9BCBC980493D@linux.dev> <4e408146-7c77-4f6d-90e8-bb311d7ab53d@126.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4e408146-7c77-4f6d-90e8-bb311d7ab53d@126.com> X-Rspamd-Action: no action X-Rspamd-Queue-Id: 5CBCA80004 X-Stat-Signature: hgg9fgycbdyc496thq469igsphoz1ukd X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1747978234-205798 X-HE-Meta: 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 1HK40BBP mX+humL03cAlnoGJzoD1Aiv2Wv8lzY3Zfh/O2dKKKElMOtP2S3udEyC9PelliMq8J3pm5OllRA7KS9dx2laTjxQxLv2ikybkof1vIHQ568TMCY+o7X6edX5npQLXvdDgyN7LU802DNFVQS3ae5TaEC2BH5AE+Gz1CRtFfr7PngXyZ8ugyii1W6PY346RAYdRMt4HgXhFDvIacjI+zriGayfFb2Kl16ezEp2/I1/RjPXO/Idv0ZWUHZpCyE6RWicRalutXtYUGgh5uMvI= 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 Fri, May 23, 2025 at 11:46:51AM +0800, Ge Yang wrote: > The implementation of alloc_and_dissolve_hugetlb_folio differs between > kernel 6.6 and kernel 6.15. To facilitate backporting, I'm planning to > submit another patch based on Oscar Salvador's suggestion. If the code differs a lot between a stable version and upstream, the way to go is to submit a specific patch for the stable one that applies to that tree, e.g: [PATCH 6.6]... -- Oscar Salvador SUSE Labs