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Date: Wed, 4 Feb 2009 02:06:26 +0100
From: Frederic Weisbecker <fweisbec@...il.com>
To: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: Steven Rostedt <rostedt@...dmis.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...e.hu>, Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [PATCH tip 1/1] trace: Make the trace_event callbacks return
enum print_line_t
On Tue, Feb 03, 2009 at 10:05:50PM -0200, Arnaldo Carvalho de Melo wrote:
> As they actually all return these enumerators.
>
> Reported-by: Frederic Weisbecker <fweisbec@...il.com>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Thanks.
I'm currently working on the implementation of the subevents, hopefully it will
actually make the things simplier for tracers like blk.
I'm not sure, will see the result and your comments :-)
> diff --git a/block/blktrace.c b/block/blktrace.c
> index 12df276..c7698d1 100644
> --- a/block/blktrace.c
> +++ b/block/blktrace.c
> @@ -1158,7 +1158,8 @@ static struct {
> [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap },
> };
>
> -static int blk_trace_event_print(struct trace_iterator *iter, int flags)
> +static enum print_line_t blk_trace_event_print(struct trace_iterator *iter,
> + int flags)
> {
> struct trace_seq *s = &iter->seq;
> const struct blk_io_trace *t = (struct blk_io_trace *)iter->ent;
> @@ -1196,7 +1197,8 @@ static int blk_trace_synthesize_old_trace(struct trace_iterator *iter)
> sizeof(old) - offset + t->pdu_len);
> }
>
> -static int blk_trace_event_print_binary(struct trace_iterator *iter, int flags)
> +static enum print_line_t
> +blk_trace_event_print_binary(struct trace_iterator *iter, int flags)
> {
> return blk_trace_synthesize_old_trace(iter) ?
> TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 5822ff4..fd51cf0 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -1495,7 +1495,7 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
>
> event = ftrace_find_event(entry->type);
> if (event && event->hex) {
> - int ret = event->hex(iter, 0);
> + enum print_line_t ret = event->hex(iter, 0);
> if (ret != TRACE_TYPE_HANDLED)
> return ret;
> }
> diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
> index f6b35e1..7ac72a4 100644
> --- a/kernel/trace/trace_branch.c
> +++ b/kernel/trace/trace_branch.c
> @@ -160,7 +160,8 @@ trace_print_print(struct trace_seq *s, struct trace_entry *entry, int flags)
> return TRACE_TYPE_PARTIAL_LINE;
> }
>
> -static int trace_branch_print(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_branch_print(struct trace_iterator *iter,
> + int flags)
> {
> struct trace_branch *field;
>
> diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
> index 5b3c914..b7380ee 100644
> --- a/kernel/trace/trace_output.c
> +++ b/kernel/trace/trace_output.c
> @@ -463,13 +463,14 @@ int unregister_ftrace_event(struct trace_event *event)
> * Standard events
> */
>
> -int trace_nop_print(struct trace_iterator *iter, int flags)
> +enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
> {
> return TRACE_TYPE_HANDLED;
> }
>
> /* TRACE_FN */
> -static int trace_fn_latency(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_fn_latency(struct trace_iterator *iter,
> + int flags)
> {
> struct ftrace_entry *field;
> struct trace_seq *s = &iter->seq;
> @@ -491,7 +492,7 @@ static int trace_fn_latency(struct trace_iterator *iter, int flags)
> return TRACE_TYPE_PARTIAL_LINE;
> }
>
> -static int trace_fn_trace(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
> {
> struct ftrace_entry *field;
> struct trace_seq *s = &iter->seq;
> @@ -518,7 +519,7 @@ static int trace_fn_trace(struct trace_iterator *iter, int flags)
> return TRACE_TYPE_PARTIAL_LINE;
> }
>
> -static int trace_fn_raw(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
> {
> struct ftrace_entry *field;
>
> @@ -532,7 +533,7 @@ static int trace_fn_raw(struct trace_iterator *iter, int flags)
> return TRACE_TYPE_HANDLED;
> }
>
> -static int trace_fn_hex(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
> {
> struct ftrace_entry *field;
> struct trace_seq *s = &iter->seq;
> @@ -545,7 +546,7 @@ static int trace_fn_hex(struct trace_iterator *iter, int flags)
> return TRACE_TYPE_HANDLED;
> }
>
> -static int trace_fn_bin(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
> {
> struct ftrace_entry *field;
> struct trace_seq *s = &iter->seq;
> @@ -568,7 +569,8 @@ static struct trace_event trace_fn_event = {
> };
>
> /* TRACE_CTX an TRACE_WAKE */
> -static int trace_ctxwake_print(struct trace_iterator *iter, char *delim)
> +static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
> + char *delim)
> {
> struct ctx_switch_entry *field;
> char *comm;
> @@ -593,12 +595,13 @@ static int trace_ctxwake_print(struct trace_iterator *iter, char *delim)
> return TRACE_TYPE_HANDLED;
> }
>
> -static int trace_ctx_print(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
> {
> return trace_ctxwake_print(iter, "==>");
> }
>
> -static int trace_wake_print(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_wake_print(struct trace_iterator *iter,
> + int flags)
> {
> return trace_ctxwake_print(iter, " +");
> }
> @@ -626,12 +629,12 @@ static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
> return TRACE_TYPE_HANDLED;
> }
>
> -static int trace_ctx_raw(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
> {
> return trace_ctxwake_raw(iter, 0);
> }
>
> -static int trace_wake_raw(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
> {
> return trace_ctxwake_raw(iter, '+');
> }
> @@ -660,17 +663,18 @@ static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
> return TRACE_TYPE_HANDLED;
> }
>
> -static int trace_ctx_hex(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
> {
> return trace_ctxwake_hex(iter, 0);
> }
>
> -static int trace_wake_hex(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
> {
> return trace_ctxwake_hex(iter, '+');
> }
>
> -static int trace_ctxwake_bin(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
> + int flags)
> {
> struct ctx_switch_entry *field;
> struct trace_seq *s = &iter->seq;
> @@ -706,7 +710,8 @@ static struct trace_event trace_wake_event = {
> };
>
> /* TRACE_SPECIAL */
> -static int trace_special_print(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_special_print(struct trace_iterator *iter,
> + int flags)
> {
> struct special_entry *field;
>
> @@ -721,7 +726,8 @@ static int trace_special_print(struct trace_iterator *iter, int flags)
> return TRACE_TYPE_HANDLED;
> }
>
> -static int trace_special_hex(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_special_hex(struct trace_iterator *iter,
> + int flags)
> {
> struct special_entry *field;
> struct trace_seq *s = &iter->seq;
> @@ -735,7 +741,8 @@ static int trace_special_hex(struct trace_iterator *iter, int flags)
> return TRACE_TYPE_HANDLED;
> }
>
> -static int trace_special_bin(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_special_bin(struct trace_iterator *iter,
> + int flags)
> {
> struct special_entry *field;
> struct trace_seq *s = &iter->seq;
> @@ -760,7 +767,8 @@ static struct trace_event trace_special_event = {
>
> /* TRACE_STACK */
>
> -static int trace_stack_print(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_stack_print(struct trace_iterator *iter,
> + int flags)
> {
> struct stack_entry *field;
> struct trace_seq *s = &iter->seq;
> @@ -796,7 +804,8 @@ static struct trace_event trace_stack_event = {
> };
>
> /* TRACE_USER_STACK */
> -static int trace_user_stack_print(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
> + int flags)
> {
> struct userstack_entry *field;
> struct trace_seq *s = &iter->seq;
> @@ -825,7 +834,8 @@ static struct trace_event trace_user_stack_event = {
> };
>
> /* TRACE_PRINT */
> -static int trace_print_print(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_print_print(struct trace_iterator *iter,
> + int flags)
> {
> struct print_entry *field;
> struct trace_seq *s = &iter->seq;
> @@ -844,7 +854,7 @@ static int trace_print_print(struct trace_iterator *iter, int flags)
> return TRACE_TYPE_PARTIAL_LINE;
> }
>
> -static int trace_print_raw(struct trace_iterator *iter, int flags)
> +static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
> {
> struct print_entry *field;
>
> diff --git a/kernel/trace/trace_output.h b/kernel/trace/trace_output.h
> index 3aeb31f..551a25a 100644
> --- a/kernel/trace/trace_output.h
> +++ b/kernel/trace/trace_output.h
> @@ -3,7 +3,8 @@
>
> #include "trace.h"
>
> -typedef int (*trace_print_func)(struct trace_iterator *iter, int flags);
> +typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
> + int flags);
>
> struct trace_event {
> struct hlist_node node;
> @@ -39,7 +40,7 @@ struct trace_event *ftrace_find_event(int type);
> int register_ftrace_event(struct trace_event *event);
> int unregister_ftrace_event(struct trace_event *event);
>
> -int trace_nop_print(struct trace_iterator *iter, int flags);
> +enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags);
>
> #define MAX_MEMHEX_BYTES 8
> #define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1)
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