ftrace: state that all functions are enabled in set_ftrace_filter (0c75a3ed) · Commits · 戴 / test

kernel/trace/ftrace.c

+23 −0

Original line number	Diff line number	Diff line
		@@ -773,6 +773,7 @@ enum {
		FTRACE_ITER_CONT = (1 << 1),
		FTRACE_ITER_NOTRACE = (1 << 2),
		FTRACE_ITER_FAILURES = (1 << 3),
		FTRACE_ITER_PRINTALL = (1 << 4),
		};

		#define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */
		@@ -794,6 +795,9 @@ t_next(struct seq_file m, void v, loff_t *pos)

		(*pos)++;

		if (iter->flags & FTRACE_ITER_PRINTALL)
		return NULL;

		/* should not be called from interrupt context */
		spin_lock(&ftrace_lock);
		retry:
		@@ -834,6 +838,19 @@ static void t_start(struct seq_file m, loff_t *pos)
		struct ftrace_iterator *iter = m->private;
		void *p = NULL;

		/*
		* For set_ftrace_filter reading, if we have the filter
		* off, we can short cut and just print out that all
		* functions are enabled.
		*/
		if (iter->flags & FTRACE_ITER_FILTER && !ftrace_filtered) {
		if (*pos > 0)
		return NULL;
		iter->flags \|= FTRACE_ITER_PRINTALL;
		(*pos)++;
		return iter;
		}

		if (*pos > 0) {
		if (iter->idx < 0)
		return p;
		@@ -852,9 +869,15 @@ static void t_stop(struct seq_file m, void p)

		static int t_show(struct seq_file m, void v)
		{
		struct ftrace_iterator *iter = m->private;
		struct dyn_ftrace *rec = v;
		char str[KSYM_SYMBOL_LEN];

		if (iter->flags & FTRACE_ITER_PRINTALL) {
		seq_printf(m, "#### all functions enabled ####\n");
		return 0;
		}

		if (!rec)
		return 0;