[PATCH 2/3] tracing/filters: disallow newline as delimeter

[Li Zefan <lizf@cn.fujitsu.com>]

I guess because user input is often ended with '\n' (like "echo xxx"),
thus '\n' is used as a delimeter besides ' ' ? But we can just strip
tailing spaces.

One of the effects of this patch, is fixing this inconsistency:

 # echo -n 'parent_comm ==' > filter
 bash: echo: write error: Invalid argument

 # echo 'parent_comm ==' > filter
 # cat filter
 parent_comm ==

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
---
 kernel/trace/trace_events_filter.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index a63f965..9ef35c1 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -362,7 +362,9 @@ int filter_parse(char **pbuf, struct filter_pred *pred)
 	char *tok, *val_str = NULL;
 	int tok_n = 0;
 
-	while ((tok = strsep(pbuf, " \n"))) {
+	strstrip(*pbuf);
+
+	while ((tok = strsep(pbuf, " "))) {
 		if (tok_n == 0) {
 			if (!strcmp(tok, "0")) {
 				pred->clear = 1;
-- 
1.5.4.rc3