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From: Shakeel Butt To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, kent.overstreet@linux.dev, vbabka@suse.cz, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, usamaarif642@gmail.com, 00107082@163.com, pasha.tatashin@soleen.com, souravpanda@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 3/3] alloc_tag: avoid warnings when freeing non-compound "tail" pages Message-ID: References: <20250909233409.1013367-1-surenb@google.com> <20250909233409.1013367-4-surenb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250909233409.1013367-4-surenb@google.com> X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: D737210000E X-Stat-Signature: 1g3oucfmjfdmooxu4qubz4x3oebtznm3 X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1757631528-33544 X-HE-Meta: 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 ruVe/Rq6 tF49q4/EOxsFSiRrfJ6Bf8su1xZscNvteOCOzo+bsMItneixULuQfb6fo/aHUz9ZZf+2krplbMHwP04+8YrTlc0TUgbXpa4mzJaMB6Tq1/tr2PECH3hfH0k1mRGQ5cWc0wTwATwMB+eVspqfyCnSwKdOOrWKUatyr8txSv6zUuRbVYwf+nlWQyLpinPIuV/TX8wd3MKQtNV9Pvv1AxAA4dvC5unj+xPcAwulDOElzBDt09NC2vS48zxCYHVfl63GDPg8PoYhuySoJrO4EWKyWxMg3BjOn7NTpcqgsizYuwVmpucDqj/pEmA9FyQWt7gEYrT9T3L8ZYFoYflw= 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 Tue, Sep 09, 2025 at 04:34:09PM -0700, Suren Baghdasaryan wrote: > When freeing "tail" pages of a non-compount high-order page, we properly > subtract the allocation tag counters, however later when these pages are > released, alloc_tag_sub() will issue warnings because tags for these pages > are NULL. > This issue was originally anticipated by Vlastimil in his review [1] and > then recently reported by David. > Prevent warnings by marking the tags empty. > > [1] https://lore.kernel.org/all/6db0f0c8-81cb-4d04-9560-ba73d63db4b8@suse.cz/ > > Suggested-by: David Wang <00107082@163.com> > Signed-off-by: Suren Baghdasaryan Acked-by: Shakeel Butt