linux-kernel - [RFC PATCH v3 10/18] dyndbg: avoid calling dyndbg_emit

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Date:   Mon, 15 Mar 2021 23:07:53 -0600
From:   Jim Cromie <jim.cromie@...il.com>
To:     jbaron@...mai.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org
Cc:     Jim Cromie <jim.cromie@...il.com>
Subject: [RFC PATCH v3 10/18] dyndbg: avoid calling dyndbg_emit_prefix when it has no work

Wrap function in a static-inline one, which checks flags to avoid
calling the function unnecessarily.

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 lib/dynamic_debug.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index af9cf97f869b..2d011ac3308d 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -615,7 +615,7 @@ static int remaining(int wrote)
 	return 0;
 }
 
-static char *dynamic_emit_prefix(const struct _ddebug *dp, char *buf)
+static char *__dynamic_emit_prefix(const struct _ddebug *dp, char *buf)
 {
 	int pos_after_tid;
 	int pos = 0;
@@ -655,6 +655,13 @@ static char *dynamic_emit_prefix(const struct _ddebug *dp, char *buf)
 	return buf;
 }
 
+static inline char *dynamic_emit_prefix(struct _ddebug *dp, char *buf)
+{
+	if (unlikely(dp->flags & _DPRINTK_FLAGS_INCL_ANY))
+		return __dynamic_emit_prefix(dp, buf);
+	return buf;
+}
+
 void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
 {
 	va_list args;
-- 
2.29.2