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Thu, 21 May 2026 02:42:52 -0700 (PDT) Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Thu, 21 May 2026 02:42:50 -0700 Message-Id: Subject: Re: [PATCH 2/8] bpf: Recover arena kernel faults with scratch page From: "Alexei Starovoitov" To: "Tejun Heo" , "David Vernet" , "Andrea Righi" , "Changwoo Min" , "Alexei Starovoitov" , "Andrii Nakryiko" , "Daniel Borkmann" , "Martin KaFai Lau" , "Kumar Kartikeya Dwivedi" Cc: "Peter Zijlstra" , "Catalin Marinas" , "Will Deacon" , "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "Dave Hansen" , "Andrew Morton" , "David Hildenbrand" , "Mike Rapoport" , "Emil Tsalapatis" , , , , , , X-Mailer: aerc References: <20260520235052.4180316-1-tj@kernel.org> <20260520235052.4180316-3-tj@kernel.org> In-Reply-To: <20260520235052.4180316-3-tj@kernel.org> X-Rspam-User: X-Rspamd-Queue-Id: 53F311A0004 X-Rspamd-Server: rspam04 X-Stat-Signature: 67a4ds5myrsx8u6ogoqbamodhq455fhi X-HE-Tag: 1779356575-898744 X-HE-Meta: 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 15K+4iv9 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed May 20, 2026 at 4:50 PM PDT, Tejun Heo wrote: > > v2: Use ptep_get_and_clear() in apply_range_clear_cb(). (David) > > Suggested-by: Alexei Starovoitov > Signed-off-by: Kumar Kartikeya Dwivedi > Signed-off-by: Tejun Heo > Cc: David Hildenbrand > --- > Documentation/bpf/kfuncs.rst | 14 +++ > arch/arm64/mm/fault.c | 10 +- > arch/x86/mm/fault.c | 12 ++- > include/linux/bpf.h | 1 + > include/linux/bpf_defs.h | 11 +++ > kernel/bpf/arena.c | 177 +++++++++++++++++++++++++++-------- > kernel/bpf/core.c | 5 + > 7 files changed, 183 insertions(+), 47 deletions(-) > create mode 100644 include/linux/bpf_defs.h First 5 patches lgtm. Should we create a stable branch out of them and pull into bpf-next and sched-ext trees? I'm preparing a followup for slab-over-arena on top of these changes.