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Thu, 21 May 2026 02:42:52 -0700 (PDT) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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> 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.