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Commit b9df92d2 authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
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ftrace: Consolidate the function match routines for normal and mods 



The code used for matching functions is almost identical between normal
selecting of functions and using the :mod: feature of set_ftrace_notrace.

Consolidate the two users into one function.

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 491d0dcf

kernel/trace/ftrace.c

+36 −62
Original line number Diff line number Diff line
@@ -1726,34 +1726,52 @@ update_record(struct dyn_ftrace *rec, unsigned long flag, int not) 
}



static int

ftrace_match_record(struct dyn_ftrace *rec, char *regex, int len, int type)

ftrace_match_record(struct dyn_ftrace *rec, char *mod,

		    char *regex, int len, int type)

{

	char str[KSYM_SYMBOL_LEN];

	char *modname;



	kallsyms_lookup(rec->ip, NULL, NULL, &modname, str);



	if (mod) {

		/* module lookup requires matching the module */

		if (!modname || strcmp(modname, mod))

			return 0;



		/* blank search means to match all funcs in the mod */

		if (!len)

			return 1;

	}



	kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);

	return ftrace_match(str, regex, len, type);

}



static int ftrace_match_records(char *buff, int len, int enable)

static int match_records(char *buff, int len, char *mod, int enable, int not)

{

	unsigned int search_len;

	unsigned search_len = 0;

	struct ftrace_page *pg;

	struct dyn_ftrace *rec;

	int type = MATCH_FULL;

	char *search = buff;

	unsigned long flag;

	char *search;

	int type;

	int not;

	int found = 0;



	flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;

	if (len) {

		type = filter_parse_regex(buff, len, &search, &not);



		search_len = strlen(search);

	}



	flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;



	mutex_lock(&ftrace_lock);



	if (unlikely(ftrace_disabled))

		goto out_unlock;



	do_for_each_ftrace_rec(pg, rec) {



		if (ftrace_match_record(rec, search, search_len, type)) {

		if (ftrace_match_record(rec, mod, search, search_len, type)) {

			update_record(rec, flag, not);

			found = 1;

		}
@@ -1763,43 +1781,23 @@ static int ftrace_match_records(char *buff, int len, int enable) 
		 */

		if (enable && (rec->flags & FTRACE_FL_FILTER))

			ftrace_filtered = 1;



	} while_for_each_ftrace_rec();

 out_unlock:

	mutex_unlock(&ftrace_lock);



	return found;

}



static int

ftrace_match_module_record(struct dyn_ftrace *rec, char *mod,

			   char *regex, int len, int type)

ftrace_match_records(char *buff, int len, int enable)

{

	char str[KSYM_SYMBOL_LEN];

	char *modname;



	kallsyms_lookup(rec->ip, NULL, NULL, &modname, str);



	if (!modname || strcmp(modname, mod))

		return 0;



	/* blank search means to match all funcs in the mod */

	if (len)

		return ftrace_match(str, regex, len, type);

	else

		return 1;

	return match_records(buff, len, NULL, enable, 0);

}



static int ftrace_match_module_records(char *buff, char *mod, int enable)

{

	unsigned search_len = 0;

	struct ftrace_page *pg;

	struct dyn_ftrace *rec;

	int type = MATCH_FULL;

	char *search = buff;

	unsigned long flag;

	int not = 0;

	int found = 0;



	flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;



	/* blank or '*' mean the same */

	if (strcmp(buff, "*") == 0)
@@ -1811,31 +1809,7 @@ static int ftrace_match_module_records(char *buff, char *mod, int enable) 
		not = 1;

	}



	if (strlen(buff)) {

		type = filter_parse_regex(buff, strlen(buff), &search, &not);

		search_len = strlen(search);

	}



	mutex_lock(&ftrace_lock);



	if (unlikely(ftrace_disabled))

		goto out_unlock;



	do_for_each_ftrace_rec(pg, rec) {



		if (ftrace_match_module_record(rec, mod,

					       search, search_len, type)) {

			update_record(rec, flag, not);

			found = 1;

		}

		if (enable && (rec->flags & FTRACE_FL_FILTER))

			ftrace_filtered = 1;



	} while_for_each_ftrace_rec();

 out_unlock:

	mutex_unlock(&ftrace_lock);



	return found;

	return match_records(buff, strlen(buff), mod, enable, not);

}



/*
@@ -1993,7 +1967,7 @@ register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, 


	do_for_each_ftrace_rec(pg, rec) {



		if (!ftrace_match_record(rec, search, len, type))

		if (!ftrace_match_record(rec, NULL, search, len, type))

			continue;



		entry = kmalloc(sizeof(*entry), GFP_KERNEL);
@@ -2548,7 +2522,7 @@ ftrace_set_func(unsigned long *array, int *idx, char *buffer) 
		if (rec->flags & FTRACE_FL_FREE)

			continue;



		if (ftrace_match_record(rec, search, search_len, type)) {

		if (ftrace_match_record(rec, NULL, search, search_len, type)) {

			/* if it is in the array */

			exists = false;

			for (i = 0; i < *idx; i++) {