From aa38e9fc3ea804290efd3a39316d7f7e6c945800 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Fri, 7 Aug 2009 10:33:02 +0800 Subject: [PATCH] tracing/filters: Add filter_type to struct ftrace_event_field The type of a field is stored as a string in @type, and here we add @filter_type which is an enum value. This prepares for later patches, so we can specifically assign different @filter_type for the same @type. For example normally a "char *" field is treated as a ptr, but we may want it to be treated as a string when doing filting. Signed-off-by: Li Zefan LKML-Reference: <4A7B925E.9030605@cn.fujitsu.com> Signed-off-by: Steven Rostedt --- kernel/trace/trace.h | 2 ++ kernel/trace/trace_events.c | 2 ++ kernel/trace/trace_events_filter.c | 23 ++++++++++++++--------- 3 files changed, 18 insertions(+), 9 deletions(-) diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 300ef788c976..64dda5709cb9 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -755,6 +755,7 @@ struct ftrace_event_field { struct list_head link; char *name; char *type; + int filter_type; int offset; int size; int is_signed; @@ -800,6 +801,7 @@ extern int apply_subsystem_event_filter(struct event_subsystem *system, char *filter_string); extern void print_subsystem_event_filter(struct event_subsystem *system, struct trace_seq *s); +extern int filter_assign_type(const char *type); static inline int filter_check_discard(struct ftrace_event_call *call, void *rec, diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 79d352027a61..5740e90f4ca1 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -44,9 +44,11 @@ int trace_define_field(struct ftrace_event_call *call, const char *type, if (!field->type) goto err; + field->filter_type = filter_assign_type(type); field->offset = offset; field->size = size; field->is_signed = is_signed; + list_add(&field->link, &call->fields); return 0; diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index 490337abed75..22e6d822bbaa 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -476,11 +476,12 @@ static int filter_add_pred_fn(struct filter_parse_state *ps, } enum { - FILTER_STATIC_STRING = 1, - FILTER_DYN_STRING + FILTER_OTHER = 0, + FILTER_STATIC_STRING, + FILTER_DYN_STRING, }; -static int is_string_field(const char *type) +int filter_assign_type(const char *type) { if (strstr(type, "__data_loc") && strstr(type, "char")) return FILTER_DYN_STRING; @@ -488,12 +489,18 @@ static int is_string_field(const char *type) if (strchr(type, '[') && strstr(type, "char")) return FILTER_STATIC_STRING; - return 0; + return FILTER_OTHER; +} + +static bool is_string_field(struct ftrace_event_field *field) +{ + return field->filter_type == FILTER_DYN_STRING || + field->filter_type == FILTER_STATIC_STRING; } static int is_legal_op(struct ftrace_event_field *field, int op) { - if (is_string_field(field->type) && (op != OP_EQ && op != OP_NE)) + if (is_string_field(field) && (op != OP_EQ && op != OP_NE)) return 0; return 1; @@ -550,7 +557,6 @@ static int filter_add_pred(struct filter_parse_state *ps, struct ftrace_event_field *field; filter_pred_fn_t fn; unsigned long long val; - int string_type; int ret; pred->fn = filter_pred_none; @@ -578,9 +584,8 @@ static int filter_add_pred(struct filter_parse_state *ps, return -EINVAL; } - string_type = is_string_field(field->type); - if (string_type) { - if (string_type == FILTER_STATIC_STRING) + if (is_string_field(field)) { + if (field->filter_type == FILTER_STATIC_STRING) fn = filter_pred_string; else fn = filter_pred_strloc; -- 2.20.1