[PATCH v2 07/14] log: Avoid including function names by default

[Simon Glass]

Unless function names are requested, the logging system should not
compile these into the code. Adjust the macros to handle this.

This means that turning on function names at runtime won't work unless
CONFIG_LOGF_FUNC is enabled. We could perhaps split this into a
separate option if that is a problem.

Enable CONFIG_LOGF_FUNC logging for sandbox since the tests expect the
function names to be included. Fix up the pinmux test which checks a
logging statement.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v2:
- Update commit message to mention the runtime impact
- Leave assert() alone since it is only compiled in with LOG_DEBUG

 common/log_console.c      |  4 ++--
 configs/sandbox_defconfig |  1 +
 include/log.h             | 16 +++++++++++-----
 test/cmd/pinmux.c         |  8 +++++++-
 test/log/log_test.c       |  4 ++--
 5 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/common/log_console.c b/common/log_console.c
index c27101b8fe2..9376baad664 100644
--- a/common/log_console.c
+++ b/common/log_console.c
@@ -38,10 +38,10 @@ static int log_console_emit(struct log_device *ldev, struct log_rec *rec)
 			printf("%d-", rec->line);
 		if (fmt & BIT(LOGF_FUNC)) {
 			if (CONFIG_IS_ENABLED(USE_TINY_PRINTF)) {
-				printf("%s()", rec->func);
+				printf("%s()", rec->func ?: "?");
 			} else {
 				printf("%*s()", CONFIG_LOGF_FUNC_PAD,
-				       rec->func);
+				       rec->func ?: "?");
 			}
 		}
 	}
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index dc5fcdbd1c9..a1a9e174de8 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -39,6 +39,7 @@ CONFIG_PRE_CONSOLE_BUFFER=y
 CONFIG_LOG=y
 CONFIG_LOG_MAX_LEVEL=9
 CONFIG_LOG_DEFAULT_LEVEL=6
+CONFIG_LOGF_FUNC=y
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_STACKPROTECTOR=y
 CONFIG_CMD_CPU=y
diff --git a/include/log.h b/include/log.h
index fc0d5984472..69dcb339543 100644
--- a/include/log.h
+++ b/include/log.h
@@ -125,7 +125,7 @@ static inline int log_uc_cat(enum uclass_id id)
  * @level: Level of log record (indicating its severity)
  * @file: File name of file where log record was generated
  * @line: Line number in file where log record was generated
- * @func: Function where log record was generated
+ * @func: Function where log record was generated, NULL if not known
  * @fmt: printf() format string for log record
  * @...: Optional parameters, according to the format string @fmt
  * Return: 0 if log record was emitted, -ve on error
@@ -141,7 +141,7 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
  * @level: Level of log record (indicating its severity)
  * @file: File name of file where log record was generated
  * @line: Line number in file where log record was generated
- * @func: Function where log record was generated
+ * @func: Function where log record was generated, NULL if not known
  * @addr:	Starting address to display at start of line
  * @data:	pointer to data buffer
  * @width:	data value width.  May be 1, 2, or 4.
@@ -193,6 +193,12 @@ int _log_buffer(enum log_category_t cat, enum log_level_t level,
 #define _LOG_DEBUG	0
 #endif
 
+#ifdef CONFIG_LOGF_FUNC
+#define _log_func	__func__
+#else
+#define _log_func	NULL
+#endif
+
 #if CONFIG_IS_ENABLED(LOG)
 
 /* Emit a log record if the level is less that the maximum */
@@ -201,7 +207,7 @@ int _log_buffer(enum log_category_t cat, enum log_level_t level,
 	if (_LOG_DEBUG != 0 || _l <= _LOG_MAX_LEVEL) \
 		_log((enum log_category_t)(_cat), \
 		     (enum log_level_t)(_l | _LOG_DEBUG), __FILE__, \
-		     __LINE__, __func__, \
+		     __LINE__, _log_func, \
 		      pr_fmt(_fmt), ##_args); \
 	})
 
@@ -211,7 +217,7 @@ int _log_buffer(enum log_category_t cat, enum log_level_t level,
 	if (_LOG_DEBUG != 0 || _l <= _LOG_MAX_LEVEL) \
 		_log_buffer((enum log_category_t)(_cat), \
 			    (enum log_level_t)(_l | _LOG_DEBUG), __FILE__, \
-			    __LINE__, __func__, _addr, _data, \
+			    __LINE__, _log_func, _addr, _data, \
 			    _width, _count, _linelen); \
 	})
 #else
@@ -314,7 +320,7 @@ void __assert_fail(const char *assertion, const char *file, unsigned int line,
 #define assert_noisy(x) \
 	({ bool _val = (x); \
 	if (!_val) \
-		__assert_fail(#x, "?", __LINE__, __func__); \
+		__assert_fail(#x, "?", __LINE__, _log_func); \
 	_val; \
 	})
 
diff --git a/test/cmd/pinmux.c b/test/cmd/pinmux.c
index 4253baa5646..7ab7004b684 100644
--- a/test/cmd/pinmux.c
+++ b/test/cmd/pinmux.c
@@ -30,7 +30,13 @@ static int dm_test_cmd_pinmux_status_pinname(struct unit_test_state *uts)
 
 	console_record_reset();
 	run_command("pinmux status P9", 0);
-	ut_assert_nextlinen("single-pinctrl pinctrl-single-no-width: missing register width");
+	if (IS_ENABLED(CONFIG_LOGF_FUNC)) {
+		ut_assert_nextlinen(
+			"   single_of_to_plat() single-pinctrl pinctrl-single-no-width: missing register width");
+	} else {
+		ut_assert_nextlinen(
+			"single-pinctrl pinctrl-single-no-width: missing register width");
+	}
 	ut_assert_nextlinen("P9 not found");
 	ut_assert_console_end();
 
diff --git a/test/log/log_test.c b/test/log/log_test.c
index 855353a9c40..d756b96dbac 100644
--- a/test/log/log_test.c
+++ b/test/log/log_test.c
@@ -452,8 +452,8 @@ int log_test_buffer(struct unit_test_state *uts)
 	/* This one should product no output due to the debug level */
 	log_buffer(LOGC_BOOT, LOGL_DEBUG, 0, buf, 1, 0x12, 0);
 
-	ut_assert_nextline("00000000: 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff  ..\"3DUfw........");
-	ut_assert_nextline("00000010: 10 00                                            ..");
+	ut_assert_nextline("     log_test_buffer() 00000000: 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff  ..\"3DUfw........");
+	ut_assert_nextline("     log_test_buffer() 00000010: 10 00                                            ..");
 	ut_assert_console_end();
 	free(buf);
 
-- 
2.34.1