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Sat, 07 Feb 2026 07:03:24 -0800 (PST) MIME-Version: 1.0 References: <20260206174017.128673-1-mikhail.v.gavrilov@gmail.com> <3BB6BA1D-3756-4FC6-B00D-79DF49D75C51@nvidia.com> <7C7CDFE7-914C-46CE-A127-B7D34304C166@nvidia.com> <4C3D8E3E-D9D6-4475-A122-FA0D930D7DAD@nvidia.com> <247E7FE9-E089-43D1-882B-81C7134C2FFE@nvidia.com> In-Reply-To: <247E7FE9-E089-43D1-882B-81C7134C2FFE@nvidia.com> From: Mikhail Gavrilov Date: Sat, 7 Feb 2026 20:03:11 +0500 X-Gm-Features: AZwV_QibOWsx0hvxPwoz0xT04dTclVaZRJpGZO3WzheOmzFRcEus6GsPC6hRFhs Message-ID: Subject: Re: [PATCH] mm/page_alloc: clear page->private in split_page() for tail pages To: Zi Yan Cc: linux-mm@kvack.org, akpm@linux-foundation.org, chrisl@kernel.org, kasong@tencent.com, hughd@google.com, stable@vger.kernel.org, David Hildenbrand , surenb@google.com, Matthew Wilcox , mhocko@suse.com, hannes@cmpxchg.org, jackmanb@google.com, vbabka@suse.cz, Kairui Song Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam12 X-Stat-Signature: 8rbagrdn7icxnsa487apn418uwrteyaj X-Rspamd-Queue-Id: 8DFF620004 X-Rspam-User: X-HE-Tag: 1770476605-665546 X-HE-Meta: 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 gdXasWqP 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 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 Sat, Feb 7, 2026 at 7:32=E2=80=AFPM Zi Yan wrote: > > Thanks. As a fix, I think we could combine the two patches above into one= and remove > the VM_WARN_ON_ONCE() or just send the second one without VM_WARN_ON_ONCE= (). > I can send a separate patch later to fix all users that do not reset ->pr= ivate > and include VM_WARN_ON_ONCE(). > > WDYT? > Makes sense. Ship the quiet fix first for stable, then add VM_WARN_ON_ONCE separately to hunt down violators in mainline. I'd vote for option 2 (just free_pages_prepare without VM_WARN) - it's simpler and covers all cases. Will your patch include a revert of the split_page() fix that's already in mm-unstable, or should that be handled separately? --=20 Best Regards, Mike Gavrilov.