Messages in this thread Patch in this message | | | Date | Tue, 03 Nov 2009 08:56:28 +0800 | From | Li Zefan <> | Subject | [PATCH 2/3] ftrace: Return EINVAL when writing invalid val to set_ftrace_filter |
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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, ¬); @@ -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
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