lkml.org 
[lkml]   [2009]   [Nov]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 2/3] ftrace: Return EINVAL when writing invalid val to set_ftrace_filter
Currently it doesn't warn user on invald value:

# echo nonexist_symbol > set_ftrace_filter
Better make it return failure.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
---
kernel/trace/ftrace.c | 12 +++++++++---
1 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 7cb6f19..e0184b7 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1724,7 +1724,7 @@ ftrace_match_record(struct dyn_ftrace *rec, char *regex, int len, int type)
return ftrace_match(str, regex, len, type);
}

-static void ftrace_match_records(char *buff, int len, int enable)
+static int ftrace_match_records(char *buff, int len, int enable)
{
unsigned int search_len;
struct ftrace_page *pg;
@@ -1733,6 +1733,7 @@ static void ftrace_match_records(char *buff, int len, int enable)
char *search;
int type;
int not;
+ int found = 0;

flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
type = filter_parse_regex(buff, len, &search, &not);
@@ -1750,6 +1751,7 @@ static void ftrace_match_records(char *buff, int len, int enable)
rec->flags &= ~flag;
else
rec->flags |= flag;
+ found = 1;
}
/*
* Only enable filtering if we have a function that
@@ -1759,6 +1761,8 @@ static void ftrace_match_records(char *buff, int len, int enable)
ftrace_filtered = 1;
} while_for_each_ftrace_rec();
mutex_unlock(&ftrace_lock);
+
+ return found;
}

static int
@@ -2151,8 +2155,10 @@ static int ftrace_process_regex(char *buff, int len, int enable)
func = strsep(&next, ":");

if (!next) {
- ftrace_match_records(func, len, enable);
- return 0;
+ if (ftrace_match_records(func, len, enable))
+ return 0;
+ else
+ return ret;
}

/* command found */
--
1.6.3


\
 
 \ /
  Last update: 2009-11-03 01:59    [from the cache]
©2003-2011 Jasper Spaans