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Signed-off-by: Vincent Donnefort diff --git a/tools/testing/selftests/ring-buffer/map_test.c b/tools/testing= /selftests/ring-buffer/map_test.c index 4bb0192e43f3..ba12fd31de87 100644 --- a/tools/testing/selftests/ring-buffer/map_test.c +++ b/tools/testing/selftests/ring-buffer/map_test.c @@ -231,15 +231,15 @@ TEST_F(map, data_mmap) =20 /* Verify meta-page padding */ if (desc->meta->meta_page_size > getpagesize()) { - void *addr; - data_len =3D desc->meta->meta_page_size; data =3D mmap(NULL, data_len, PROT_READ, MAP_SHARED, desc->cpu_fd, 0); ASSERT_NE(data, MAP_FAILED); =20 - addr =3D (void *)((unsigned long)data + getpagesize()); - ASSERT_EQ(*((int *)addr), 0); + for (int i =3D desc->meta->meta_struct_len; + i < desc->meta->meta_page_size; i +=3D sizeof(int)) + ASSERT_EQ(*(int *)(data + i), 0); + munmap(data, data_len); } } --=20 2.46.0.598.g6f2099f65c-goog From nobody Sun Feb 8 09:04:31 2026 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6FF8A197A9F for ; 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Tue, 10 Sep 2024 07:43:33 -0700 (PDT) Date: Tue, 10 Sep 2024 15:43:23 +0100 In-Reply-To: <20240910144323.2888480-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240910144323.2888480-1-vdonnefort@google.com> X-Mailer: git-send-email 2.46.0.598.g6f2099f65c-goog Message-ID: <20240910144323.2888480-3-vdonnefort@google.com> Subject: [PATCH 2/2] ring-buffer/selftest: Handle meta-page bigger than the system From: Vincent Donnefort To: rostedt@goodmis.org Cc: mhiramat@kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, kernel-team@android.com, Vincent Donnefort Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Handle the case where the meta-page content is bigger than the system page-size. This prepares the ground for extending features covered by the meta-page. Signed-off-by: Vincent Donnefort diff --git a/tools/testing/selftests/ring-buffer/map_test.c b/tools/testing= /selftests/ring-buffer/map_test.c index ba12fd31de87..d10a847130fb 100644 --- a/tools/testing/selftests/ring-buffer/map_test.c +++ b/tools/testing/selftests/ring-buffer/map_test.c @@ -92,12 +92,22 @@ int tracefs_cpu_map(struct tracefs_cpu_map_desc *desc, = int cpu) if (desc->cpu_fd < 0) return -ENODEV; =20 +again: map =3D mmap(NULL, page_size, PROT_READ, MAP_SHARED, desc->cpu_fd, 0); if (map =3D=3D MAP_FAILED) return -errno; =20 desc->meta =3D (struct trace_buffer_meta *)map; =20 + /* the meta-page is bigger than the original mapping */ + if (page_size < desc->meta->meta_struct_len) { + int meta_page_size =3D desc->meta->meta_page_size; + + munmap(desc->meta, page_size); + page_size =3D meta_page_size; + goto again; + } + return 0; } =20 --=20 2.46.0.598.g6f2099f65c-goog