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Date: Fri, 23 Feb 2024 09:18:49 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Ville Syrjälä <ville.syrjala@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Chuck Lever <chuck.lever@...cle.com>
Subject: [for-next][PATCH 11/13] tracing: Use EVENT_NULL_STR macro instead of open coding "(null)"
From: "Steven Rostedt (Google)" <rostedt@...dmis.org>
The TRACE_EVENT macros has some dependency if a __string() field is NULL,
where it will save "(null)" as the string. This string is also used by
__assign_str(). It's better to create a single macro instead of having
something that will not be caught by the compiler if there is an
unfortunate typo.
Link: https://lore.kernel.org/linux-trace-kernel/20240222211443.106216915@goodmis.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: =?utf-8?b?VmlsbGUgU3lyasOkbMOk?= <ville.syrjala@...ux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
Cc: Chuck Lever <chuck.lever@...cle.com>
Suggested-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
include/linux/trace_events.h | 3 +++
include/trace/events/sunrpc.h | 12 ++++++------
include/trace/stages/stage5_get_offsets.h | 4 ++--
include/trace/stages/stage6_event_callback.h | 8 ++++----
4 files changed, 15 insertions(+), 12 deletions(-)
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index d68ff9b1247f..b9d88aced7e1 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -17,6 +17,9 @@ struct dentry;
struct bpf_prog;
union bpf_attr;
+/* Used for event string fields when they are NULL */
+#define EVENT_NULL_STR "(null)"
+
const char *trace_print_flags_seq(struct trace_seq *p, const char *delim,
unsigned long flags,
const struct trace_print_flags *flag_array);
diff --git a/include/trace/events/sunrpc.h b/include/trace/events/sunrpc.h
index cdd3a45e6003..ce6a85b82afa 100644
--- a/include/trace/events/sunrpc.h
+++ b/include/trace/events/sunrpc.h
@@ -1327,18 +1327,18 @@ TRACE_EVENT(xs_stream_read_data,
__field(ssize_t, err)
__field(size_t, total)
__string(addr, xprt ? xprt->address_strings[RPC_DISPLAY_ADDR] :
- "(null)")
+ EVENT_NULL_STR)
__string(port, xprt ? xprt->address_strings[RPC_DISPLAY_PORT] :
- "(null)")
+ EVENT_NULL_STR)
),
TP_fast_assign(
__entry->err = err;
__entry->total = total;
__assign_str(addr, xprt ?
- xprt->address_strings[RPC_DISPLAY_ADDR] : "(null)");
+ xprt->address_strings[RPC_DISPLAY_ADDR] : EVENT_NULL_STR);
__assign_str(port, xprt ?
- xprt->address_strings[RPC_DISPLAY_PORT] : "(null)");
+ xprt->address_strings[RPC_DISPLAY_PORT] : EVENT_NULL_STR);
),
TP_printk("peer=[%s]:%s err=%zd total=%zu", __get_str(addr),
@@ -1783,7 +1783,7 @@ TRACE_EVENT(svc_process,
__string(service, name)
__string(procedure, svc_proc_name(rqst))
__string(addr, rqst->rq_xprt ?
- rqst->rq_xprt->xpt_remotebuf : "(null)")
+ rqst->rq_xprt->xpt_remotebuf : EVENT_NULL_STR)
),
TP_fast_assign(
@@ -1793,7 +1793,7 @@ TRACE_EVENT(svc_process,
__assign_str(service, name);
__assign_str(procedure, svc_proc_name(rqst));
__assign_str(addr, rqst->rq_xprt ?
- rqst->rq_xprt->xpt_remotebuf : "(null)");
+ rqst->rq_xprt->xpt_remotebuf : EVENT_NULL_STR);
),
TP_printk("addr=%s xid=0x%08x service=%s vers=%u proc=%s",
diff --git a/include/trace/stages/stage5_get_offsets.h b/include/trace/stages/stage5_get_offsets.h
index 20b801ed3fd4..e6b96608f452 100644
--- a/include/trace/stages/stage5_get_offsets.h
+++ b/include/trace/stages/stage5_get_offsets.h
@@ -47,7 +47,7 @@
#undef __string
#define __string(item, src) __dynamic_array(char, item, \
- strlen((const char *)(src) ? : "(null)") + 1) \
+ strlen((const char *)(src) ? : EVENT_NULL_STR) + 1) \
__data_offsets->item##_ptr_ = src;
#undef __string_len
@@ -70,7 +70,7 @@
#undef __rel_string
#define __rel_string(item, src) __rel_dynamic_array(char, item, \
- strlen((const char *)(src) ? : "(null)") + 1) \
+ strlen((const char *)(src) ? : EVENT_NULL_STR) + 1) \
__data_offsets->item##_ptr_ = src;
#undef __rel_string_len
diff --git a/include/trace/stages/stage6_event_callback.h b/include/trace/stages/stage6_event_callback.h
index 38732855eadb..2bfd49713b42 100644
--- a/include/trace/stages/stage6_event_callback.h
+++ b/include/trace/stages/stage6_event_callback.h
@@ -32,14 +32,14 @@
#undef __assign_str
#define __assign_str(dst, src) \
- memcpy(__get_str(dst), __data_offsets.dst##_ptr_ ? : "(null)", \
+ memcpy(__get_str(dst), __data_offsets.dst##_ptr_ ? : EVENT_NULL_STR, \
__get_dynamic_array_len(dst))
#undef __assign_str_len
#define __assign_str_len(dst, src, len) \
do { \
memcpy(__get_str(dst), \
- __data_offsets.dst##_ptr_ ? : "(null)", len); \
+ __data_offsets.dst##_ptr_ ? : EVENT_NULL_STR, len); \
__get_str(dst)[len] = '\0'; \
} while(0)
@@ -94,14 +94,14 @@
#undef __assign_rel_str
#define __assign_rel_str(dst, src) \
- memcpy(__get_rel_str(dst), __data_offsets.dst##_ptr_ ? : "(null)", \
+ memcpy(__get_rel_str(dst), __data_offsets.dst##_ptr_ ? : EVENT_NULL_STR, \
__get_rel_dynamic_array_len(dst))
#undef __assign_rel_str_len
#define __assign_rel_str_len(dst, src, len) \
do { \
memcpy(__get_rel_str(dst), \
- __data_offsets.dst##_ptr_ ? : "(null)", len); \
+ __data_offsets.dst##_ptr_ ? : EVENT_NULL_STR, len); \
__get_rel_str(dst)[len] = '\0'; \
} while (0)
--
2.43.0
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