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([23.254.208.9]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-169a567aef5sm8975712c88.19.2026.10.09.19.52.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2026 19:52:58 -0700 (PDT) From: Qiliang Yuan To: "T.J. Mercier" Cc: Andrii Nakryiko , Eduard Zingerman , Ihor Solodrai , Alexei Starovoitov , Daniel Borkmann , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Shuah Khan , =?UTF-8?Q?Christian_K=C3=B6nig?= , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH bpf-next] selftests/bpf: Accept unnamed dma-bufs in the dmabuf_iter default test Date: Sat, 10 Oct 2026 10:52:52 +0800 Message-ID: <20261010025252.3716641-1-odys.yuan@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: <20261009-selftests-bpf-dmabuf-iter-unnamed-v1-1-962ee94f7a5e@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On Fri, Oct 9, 2026 at 5:07 PM T.J. Mercier wrote: > Hi Qiliang, are you running this locally instead of with: > tools/testing/selftests/bpf/vmtest.sh -- ./test_progs? Yes, I ran ./test_progs directly in a Debian testing VM, not through vmtest.sh. The VM runs a GNOME desktop on virtio-gpu, and gnome-shell, mutter-x11-frames and ibus-x11 each hold a 4 KiB udmabuf without a name (their fdinfo shows exp_name udmabuf and no name line). As the iterator walks every dma-buf in the system, default_iter fails on such a machine before it gets to the two buffers it created. The minimal VM of vmtest.sh has no such buffers, so it doesn't show up there. The subtest only checks its own two buffers, so skipping over the name of any other buffer seemed safer than relying on all of them having one. Thanks, Qiliang