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Commit c5b44095 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'trace-v5.2-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace 

Pull tracing warning fix from Steven Rostedt:
 "Make the GCC 9 warning for sub struct memset go away.

  GCC 9 now warns about calling memset() on partial structures when it
  goes across multiple fields. This adds a helper for the place in
  tracing that does this type of clearing of a structure"

* tag 'trace-v5.2-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Silence GCC 9 array bounds warning
parents 862f0a32 0c97bf86

kernel/trace/trace.c

+1 −5
Original line number Diff line number Diff line
@@ -8910,12 +8910,8 @@ void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) 


		cnt++;



		/* reset all but tr, trace, and overruns */

		memset(&iter.seq, 0,

		       sizeof(struct trace_iterator) -

		       offsetof(struct trace_iterator, seq));

		trace_iterator_reset(&iter);

		iter.iter_flags |= TRACE_FILE_LAT_FMT;

		iter.pos = -1;



		if (trace_find_next_entry_inc(&iter) != NULL) {

			int ret;

kernel/trace/trace.h

+18 −0
Original line number Diff line number Diff line
@@ -1966,4 +1966,22 @@ static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 


extern struct trace_iterator *tracepoint_print_iter;



/*

 * Reset the state of the trace_iterator so that it can read consumed data.

 * Normally, the trace_iterator is used for reading the data when it is not

 * consumed, and must retain state.

 */

static __always_inline void trace_iterator_reset(struct trace_iterator *iter)

{

	const size_t offset = offsetof(struct trace_iterator, seq);



	/*

	 * Keep gcc from complaining about overwriting more than just one

	 * member in the structure.

	 */

	memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset);



	iter->pos = -1;

}



#endif /* _LINUX_KERNEL_TRACE_H */

kernel/trace/trace_kdb.c

+1 −5
Original line number Diff line number Diff line
@@ -37,12 +37,8 @@ static void ftrace_dump_buf(int skip_entries, long cpu_file) 
	if (skip_entries)

		kdb_printf("(skipping %d entries)\n", skip_entries);



	/* reset all but tr, trace, and overruns */

	memset(&iter.seq, 0,

		   sizeof(struct trace_iterator) -

		   offsetof(struct trace_iterator, seq));

	trace_iterator_reset(&iter);

	iter.iter_flags |= TRACE_FILE_LAT_FMT;

	iter.pos = -1;



	if (cpu_file == RING_BUFFER_ALL_CPUS) {

		for_each_tracing_cpu(cpu) {