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Tue, 30 Jun 2026 11:06:31 -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: Tue, 30 Jun 2026 11:06:30 -0700 Message-Id: Subject: Re: [PATCH bpf] selftests/bpf: Skip libarena when the BPF backend lacks 32-bit arena cmpxchg From: "Alexei Starovoitov" To: "George Guo" , "Alexei Starovoitov" , "Daniel Borkmann" , "Andrii Nakryiko" Cc: "Eduard Zingerman" , "Emil Tsalapatis" , "Mykola Lysenko" , "Martin KaFai Lau" , "Kumar Kartikeya Dwivedi" , "Huacai Chen" , "Tiezhu Yang" , "George Guo" , , , X-Mailer: aerc References: <20260630025809.74043-1-dongtai.guo@linux.dev> In-Reply-To: <20260630025809.74043-1-dongtai.guo@linux.dev> On Mon Jun 29, 2026 at 7:58 PM PDT, George Guo wrote: > From: George Guo > > The arena qspinlock pulled in by libarena (bpf_arena_spin_lock.h) perform= s > a 32-bit atomic compare-and-exchange on an arena (address space 1) pointe= r > via atomic_try_cmpxchg_acquire() on the 32-bit atomic_t lock word. Not > every LLVM BPF backend can select that operation; releases such as clang = 19 > abort instruction selection with: Sorry, you have to upgrade your test environment. We won't be disabling tests because people still have old clang or old gcc or other older tools in their setups. pw-bot: cr