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tracing: Use tracing error_log with trace event filters 

Use tracing_log_err() from the new tracing error_log mechanism to send
filter parse errors to tracing/error_log.

With this change, users will be able to see filter errors by looking
at tracing/error_log.

The same errors will also be available in the filter file, as
expected.

Link: http://lkml.kernel.org/r/1d942c419941539a11d78a6810fc5740a99b2974.1554072478.git.tom.zanussi@linux.intel.com

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi 2019-03-31 18:48:18 -05:00 committed by Steven Rostedt (VMware)
parent d566c5e9d1
commit 34f76afaac
1 changed files with 9 additions and 2 deletions
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11
kernel/trace/trace_events_filter.c
View File

@ -66,7 +66,8 @@ static const char * ops[] = { OPS };
C(INVALID_FILTER, "Meaningless filter expression"), \
C(IP_FIELD_ONLY, "Only 'ip' field is supported for function trace"), \
C(INVALID_VALUE, "Invalid value (did you forget quotes)?"), \
C(NO_FILTER, "No filter found"),
C(ERRNO, "Error"), \
C(NO_FILTER, "No filter found")
#undef C
#define C(a, b) FILT_ERR_##a
@ -76,7 +77,7 @@ enum { ERRORS };
#undef C
#define C(a, b) b
static char *err_text[] = { ERRORS };
static const char *err_text[] = { ERRORS };
/* Called after a '!' character but "!=" and "!~" are not "not"s */
static bool is_not(const char *str)
@ -947,8 +948,14 @@ static void append_filter_err(struct filter_parse_error *pe,
if (pe->lasterr > 0) {
trace_seq_printf(s, "\n%*s", pos, "^");
trace_seq_printf(s, "\nparse_error: %s\n", err_text[pe->lasterr]);
tracing_log_err("event filter parse error",
filter->filter_string, err_text,
pe->lasterr, pe->lasterr_pos);
} else {
trace_seq_printf(s, "\nError: (%d)\n", pe->lasterr);
tracing_log_err("event filter parse error",
filter->filter_string, err_text,
FILT_ERR_ERRNO, 0);
}
trace_seq_putc(s, 0);
buf = kmemdup_nul(s->buffer, s->seq.len, GFP_KERNEL);