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tracing fix for v6.19:

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- 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.
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Merge tag 'trace-v6.19-4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull tracing fixes from Steven Rostedt:

 - 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.

* tag 'trace-v6.19-4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  MAINTAINERS: Add tracepoint-update.c to TRACING section
  tracing: Fix unused tracepoints when module uses only exported ones
This commit is contained in:
Linus Torvalds 2025-12-10 16:38:50 +09:00
commit 2f7041e59b
2 changed files with 4 additions and 0 deletions
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1
MAINTAINERS
View file

@ -26455,6 +26455,7 @@ 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)

3
scripts/tracepoint-update.c
View file

@ -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;
}