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h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=aAOLkdylAOs7Gx/pumsYaXDaFDsWQDPbx2TdX4oJAkjfwD+s/6Jpa+fLZYDcw68uR 3JuZJqe3PM8qoQ4triJ0mxt0kW+Vjh0p8LlkdSIMhJ3Ey2SqNlW4725ckmevNH3Ifb XKXQ8oCjBmkldnOry7jn9ShllEB7nnhRoGiwKgCc= Message-ID: Date: Mon, 27 Apr 2026 09:20:32 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 3/3] mm: skip KASAN tagging for page-allocated page tables To: Catalin Marinas Cc: arnd@arndb.de, kees@kernel.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, akpm@linux-foundation.org, david@kernel.org, urezki@gmail.com, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, tglx@kernel.org, usama.anjum@arm.com, mathieu.desnoyers@efficios.com, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Ryan Roberts References: <20260424130157.3163009-1-dev.jain@arm.com> <20260424130157.3163009-4-dev.jain@arm.com> Content-Language: en-US From: Dev Jain In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 4BB85A0002 X-Rspamd-Server: rspam04 X-Stat-Signature: 5kyz5poj6mn1aehjdtafmzk1wtq16q3u X-HE-Tag: 1777261845-250877 X-HE-Meta: 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 nMc3omv7 DDo7PjK/j1siO2FF7BAWEq73KexuGYwgLc/mVzCBqS2i854OfBNH8EHVN+CfzsLlcMUdhzNaS/jdxLxydHpYQ1tkxzKQ6/JufBDEo3rBUR7xZACQS1XujVP9/9aZM0C7MkHjiTe54jBKistkQHBK8t3u/RxvTZeDfZ/9cDIKP5O7IG607dut0Mh4Qp2A06yHF7RqKtQ3iBwm0+evUOqPtAenKREYDj/Hu0tldX79sjmBLlEFdUuJLx5GvycI/3uNKPArhkxB7eGUnm3GZA40dpS0In3xX96+0YsMtU+V9KTrnl6K4TGO0hzUlxETmF5Yxcbcg Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 24/04/26 11:11 pm, Catalin Marinas wrote: > On Fri, Apr 24, 2026 at 06:31:57PM +0530, Dev Jain wrote: >> From: Muhammad Usama Anjum >> >> Page tables are always accessed via the linear mapping with a match-all >> tag, so HW-tag KASAN never checks them. For page-allocated tables (PTEs >> and PGDs etc), avoid the tag setup and poisoning overhead by using >> __GFP_SKIP_KASAN. SLUB-backed page tables are unchanged for now. (They >> aren't widely used and require more SLUB related skip logic. Leave it >> later.) >> >> Reviewed-by: Ryan Roberts >> Signed-off-by: Muhammad Usama Anjum >> Acked-by: David Hildenbrand (Arm) >> Reviewed-by: Catalin Marinas > > Your signed-off-by is missing. You must add it if you are reposting > someone else's patches. Okay I read submitting-patches properly and didn't know we should add SOB even if we are sending it as it is ... "Any further SoBs (Signed-off-by:'s) following the author's SoB are from people handling and transporting the patch, but were not involved in its development. SoB chains should reflect the **real** route a patch took as it was propagated to the maintainers and ultimately to Linus, with the first SoB entry signalling primary authorship of a single author." So I'll re-order the tags as Reviewed-by: Ryan Roberts Reviewed-by: Catalin Marinas Acked-by: David Hildenbrand (Arm) Signed-off-by: Muhammad Usama Anjum Signed-off-by: Dev Jain > > Also I only got cc'ed on patch 3. You should normally cc all people on > all patches. Maybe you could skip this if the patches are some > independent cleanups but even so, I'd still cc all the others at least > on the cover letter. Oops didn't realize my script was not taking a union of the result of get_maintainer on each patch. I'll fix that. >