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Commit 6d5b43a6 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

Merge branch 'tip/urgent' of... 

Merge branch 'tip/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/urgent
parents 641d2f63 32464779

kernel/trace/ftrace.c

+54 −59
Original line number Diff line number Diff line
@@ -326,96 +326,89 @@ ftrace_record_ip(unsigned long ip) 


static int

__ftrace_replace_code(struct dyn_ftrace *rec,

		      unsigned char *old, unsigned char *new, int enable)

		      unsigned char *nop, int enable)

{

	unsigned long ip, fl;

	unsigned char *call, *old, *new;



	ip = rec->ip;



	if (ftrace_filtered && enable) {

	/*

		 * If filtering is on:

	 * If this record is not to be traced and

	 * it is not enabled then do nothing.

	 *

		 * If this record is set to be filtered and

		 * is enabled then do nothing.

	 * If this record is not to be traced and

	 * it is enabled then disabled it.

	 *

		 * If this record is set to be filtered and

		 * it is not enabled, enable it.

		 *

		 * If this record is not set to be filtered

		 * and it is not enabled do nothing.

		 *

		 * If this record is set not to trace then

		 * do nothing.

		 *

		 * If this record is set not to trace and

		 * it is enabled then disable it.

		 *

		 * If this record is not set to be filtered and

		 * it is enabled, disable it.

	 */



		fl = rec->flags & (FTRACE_FL_FILTER | FTRACE_FL_NOTRACE |

				   FTRACE_FL_ENABLED);



		if ((fl ==  (FTRACE_FL_FILTER | FTRACE_FL_ENABLED)) ||

		    (fl ==  (FTRACE_FL_FILTER | FTRACE_FL_NOTRACE)) ||

		    !fl || (fl == FTRACE_FL_NOTRACE))

	if (rec->flags & FTRACE_FL_NOTRACE) {

		if (rec->flags & FTRACE_FL_ENABLED)

			rec->flags &= ~FTRACE_FL_ENABLED;

		else

			return 0;



	} else if (ftrace_filtered && enable) {

		/*

		 * If it is enabled disable it,

		 * otherwise enable it!

		 * Filtering is on:

		 */

		if (fl & FTRACE_FL_ENABLED) {

			/* swap new and old */

			new = old;

			old = ftrace_call_replace(ip, FTRACE_ADDR);

			rec->flags &= ~FTRACE_FL_ENABLED;

		} else {

			new = ftrace_call_replace(ip, FTRACE_ADDR);

			rec->flags |= FTRACE_FL_ENABLED;

		}

	} else {



		if (enable) {

			/*

			 * If this record is set not to trace and is

			 * not enabled, do nothing.

			 */

			fl = rec->flags & (FTRACE_FL_NOTRACE | FTRACE_FL_ENABLED);

			if (fl == FTRACE_FL_NOTRACE)

		fl = rec->flags & (FTRACE_FL_FILTER | FTRACE_FL_ENABLED);



		/* Record is filtered and enabled, do nothing */

		if (fl == (FTRACE_FL_FILTER | FTRACE_FL_ENABLED))

			return 0;



			new = ftrace_call_replace(ip, FTRACE_ADDR);

		} else

			old = ftrace_call_replace(ip, FTRACE_ADDR);

		/* Record is not filtered and is not enabled do nothing */

		if (!fl)

			return 0;



		/* Record is not filtered but enabled, disable it */

		if (fl == FTRACE_FL_ENABLED)

			rec->flags &= ~FTRACE_FL_ENABLED;

		else

		/* Otherwise record is filtered but not enabled, enable it */

			rec->flags |= FTRACE_FL_ENABLED;

	} else {

		/* Disable or not filtered */



		if (enable) {

			/* if record is enabled, do nothing */

			if (rec->flags & FTRACE_FL_ENABLED)

				return 0;



			rec->flags |= FTRACE_FL_ENABLED;



		} else {



			/* if record is not enabled do nothing */

			if (!(rec->flags & FTRACE_FL_ENABLED))

				return 0;



			rec->flags &= ~FTRACE_FL_ENABLED;

		}

	}



	call = ftrace_call_replace(ip, FTRACE_ADDR);



	if (rec->flags & FTRACE_FL_ENABLED) {

		old = nop;

		new = call;

	} else {

		old = call;

		new = nop;

	}



	return ftrace_modify_code(ip, old, new);

}



static void ftrace_replace_code(int enable)

{

	int i, failed;

	unsigned char *new = NULL, *old = NULL;

	unsigned char *nop = NULL;

	struct dyn_ftrace *rec;

	struct ftrace_page *pg;



	if (enable)

		old = ftrace_nop_replace();

	else

		new = ftrace_nop_replace();

	nop = ftrace_nop_replace();



	for (pg = ftrace_pages_start; pg; pg = pg->next) {

		for (i = 0; i < pg->index; i++) {
@@ -433,7 +426,7 @@ static void ftrace_replace_code(int enable) 
				unfreeze_record(rec);

			}



			failed = __ftrace_replace_code(rec, old, new, enable);

			failed = __ftrace_replace_code(rec, nop, enable);

			if (failed && (rec->flags & FTRACE_FL_CONVERTED)) {

				rec->flags |= FTRACE_FL_FAILED;

				if ((system_state == SYSTEM_BOOTING) ||
@@ -534,7 +527,6 @@ static void ftrace_startup(void) 


	mutex_lock(&ftrace_start_lock);

	ftrace_start++;

	if (ftrace_start == 1)

	command |= FTRACE_ENABLE_CALLS;



	if (saved_ftrace_func != ftrace_trace_function) {
@@ -734,6 +726,9 @@ t_next(struct seq_file *m, void *v, loff_t *pos) 
		    ((iter->flags & FTRACE_ITER_FAILURES) &&

		     !(rec->flags & FTRACE_FL_FAILED)) ||



		    ((iter->flags & FTRACE_ITER_FILTER) &&

		     !(rec->flags & FTRACE_FL_FILTER)) ||



		    ((iter->flags & FTRACE_ITER_NOTRACE) &&

		     !(rec->flags & FTRACE_FL_NOTRACE))) {

			rec = NULL;
@@ -1186,7 +1181,7 @@ ftrace_regex_release(struct inode *inode, struct file *file, int enable) 


	mutex_lock(&ftrace_sysctl_lock);

	mutex_lock(&ftrace_start_lock);

	if (iter->filtered && ftrace_start && ftrace_enabled)

	if (ftrace_start && ftrace_enabled)

		ftrace_run_update_code(FTRACE_ENABLE_CALLS);

	mutex_unlock(&ftrace_start_lock);

	mutex_unlock(&ftrace_sysctl_lock);