linux-kernel - [GIT PULL v2] tracing: Fix for v6.19

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251209214834.0c185482@fedora>
Date: Tue, 9 Dec 2025 21:48:34 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [GIT PULL v2] tracing: Fix for v6.19

Linus,

tracing fix for v6.19:

- Fix unused tracepoint build for modules only using exported tracepoints

  The tracepoint-update.c code that looks for unused tracepoints expects
  if tracepoints are used then it will have tracepoints defined. If
  not, it errors out which fails the build.

  In most cases this the way things work. A tracepoint can't be used if
  it is not defined. There is one exception; If a module only uses
  tracepoints that are defined in other modules or the vmlinux proper,
  where the tracepoints are exported. In this case, the
  tracepoint-update.c code thinks tracepoints are used but not defined
  and errors out, failing the build.

  When tracepoint-update.c detects this case, if it is a module that is
  being processed, exit out normally as it is a legitimate case.

- Add tracepoint-update.c to MAINTAINERS file

  The tracepoint-update.c file is specific to tracing so add it to the
  tracing subsystem in the MAINTAINERS file.

Please pull the latest trace-v6.19-4 tree, which can be found at:

  git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
trace-v6.19-4

Tag SHA1: ee4b6dd23fc915e0745099f0b9d236570858b828
Head SHA1: 2c22361ab628adbca82ab2da6d41b7cfeb14b83c

Steven Rostedt (2):
      tracing: Fix unused tracepoints when module uses only exported ones
      MAINTAINERS: Add tracepoint-update.c to TRACING section

----
 MAINTAINERS                 | 1 +
 scripts/tracepoint-update.c | 3 +++
 2 files changed, 4 insertions(+)
---------------------------
Changes since v1: https://lore.kernel.org/all/20251209202032.4430caac@fedora/

- Fixed typos and grammar in change log of patch

- Added MAINTAINERS patch

diff --git a/MAINTAINERS b/MAINTAINERS
index 27bd8a9cf0ad..44036a5b4e3a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -26298,6 +26298,7 @@ F:	include/trace/
 F:	kernel/trace/
 F:	kernel/tracepoint.c
 F:	scripts/tracing/
+F:	scripts/tracepoint-update.c
 F:	tools/testing/selftests/ftrace/

 TRACING MMIO ACCESSES (MMIOTRACE)
diff --git a/scripts/tracepoint-update.c b/scripts/tracepoint-update.c
index 7f7d90df14ce..90046aedc97b 100644
--- a/scripts/tracepoint-update.c
+++ b/scripts/tracepoint-update.c
@@ -210,6 +210,9 @@ static int process_tracepoints(bool mod, void *addr, const char *fname)
 	}

 	if (!tracepoint_data_sec) {
+		/* A module may reference only exported tracepoints */
+		if (mod)
+			return 0;
 		fprintf(stderr,	"no __tracepoint_strings in file: %s\n", fname);
 		return -1;
 	}