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AJvYcCVIduL1UV6wF2K9GWVVjEpZ502XY0EDhu0KKyYHCv695NS1HDeL1aSat+LFYMbaHt39ANInx+3CGIhvjIE=@vger.kernel.org X-Gm-Message-State: AOJu0YzA+Hi7col26Bu+ZTvs7Z6TwRXKKThLLEH5tLDuNoGmvfg+tNjA V6Epz7eXjfL+cbjCxOIMZcgaJFz7YClGUUn1ueTf4yecXbxVCFg6VtEpZ3M+gG2jV4EdpDEn6aC kONJk9D/z/giaSEEpRYPK2Q== X-Google-Smtp-Source: AGHT+IHQ12IlCfmMAydiKBsHPD9Q4iJr8SeYEXmAn4PmVdl5+Rxkjar+IUCHmSelDg/tdXKzfnSMs19tRFdbpfxM X-Received: from wmdd3.prod.google.com ([2002:a05:600c:a203:b0:45c:b62f:ca0d]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6000:18a9:b0:411:3c14:3aa1 with SMTP id ffacd0b85a97d-42567139debmr2038918f8f.3.1759498754083; Fri, 03 Oct 2025 06:39:14 -0700 (PDT) Date: Fri, 3 Oct 2025 14:38:15 +0100 In-Reply-To: <20251003133825.2068970-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251003133825.2068970-1-vdonnefort@google.com> X-Mailer: git-send-email 2.51.0.618.g983fd99d29-goog Message-ID: <20251003133825.2068970-19-vdonnefort@google.com> Subject: [PATCH v7 18/28] tracing: Check for undefined symbols in simple_ring_buffer From: Vincent Donnefort To: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org, Vincent Donnefort Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The simple_ring_buffer implementation must remain simple enough to be used by the pKVM hypervisor. Prevent the object build if unresolved symbols are found. Signed-off-by: Vincent Donnefort diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile index 53534447e70b..38523ea2e19b 100644 --- a/kernel/trace/Makefile +++ b/kernel/trace/Makefile @@ -114,4 +114,20 @@ obj-$(CONFIG_TRACE_REMOTE) +=3D trace_remote.o obj-$(CONFIG_SIMPLE_RING_BUFFER) +=3D simple_ring_buffer.o obj-$(CONFIG_TRACE_REMOTE_TEST) +=3D remote_test.o =20 +# +# simple_ring_buffer is used by the pKVM hypervisor which does not have ac= cess +# to all kernel symbols. Fail the build if forbidden symbols are found. +# +UNDEFINED_ALLOWLIST :=3D memset alt_cb_patch_nops __x86 __ubsan __asan __k= asan __gcov __aeabi_unwind +UNDEFINED_ALLOWLIST +=3D __stack_chk_fail stackleak_track_stack __ref_stac= k __sanitizer +UNDEFINED_ALLOWLIST :=3D $(addprefix -e , $(UNDEFINED_ALLOWLIST)) + +quiet_cmd_check_undefined =3D NM $< + cmd_check_undefined =3D test -z "`$(NM) -u $< | grep -v $(UNDEFINED_= ALLOWLIST)`" + +$(obj)/%.o.checked: $(obj)/%.o FORCE + $(call if_changed,check_undefined) + +always-$(CONFIG_SIMPLE_RING_BUFFER) +=3D simple_ring_buffer.o.checked + libftrace-y :=3D ftrace.o --=20 2.51.0.618.g983fd99d29-goog