syslog/channel: move syslog channel map into rodata

add SYSLOG_REGISTER to support disable syslog channel register

Signed-off-by: chao an <anchao@lixiang.com>

Author: anchao

arch/arm/Kconfig

@@ -1374,6 +1374,7 @@ config DEBUG_SECUREFAULT
 config ARM_SEMIHOSTING_SYSLOG
 	bool "Semihosting SYSLOG support"
 	select ARCH_SYSLOG
+	select SYSLOG_REGISTER
 	---help---
 		Enable hooks to support semihosting syslog output.
 

drivers/syslog/Kconfig

@@ -196,6 +196,7 @@ if !ARCH_SYSLOG
 config SYSLOG_CHAR
 	bool "Log to a character device"
 	default n
+	select SYSLOG_REGISTER
 	---help---
 		Enable the generic character device for the SYSLOG. The full path to the
 		SYSLOG device is provided by SYSLOG_DEVPATH. A valid character device (or
@@ -231,6 +232,7 @@ config SYSLOG_CONSOLE
 	bool "Log to /dev/console"
 	default !ARCH_LOWPUTC && !SYSLOG_CHAR && !RAMLOG_SYSLOG && !SYSLOG_RPMSG && !SYSLOG_RTT
 	depends on DEV_CONSOLE
+	select SYSLOG_REGISTER
 	---help---
 		Use the system console as a SYSLOG output device.
 
@@ -291,6 +293,7 @@ config SYSLOG_RPMSG_SERVER_CHARDEV
 menuconfig SYSLOG_FILE
 	bool "Syslog file output"
 	default n
+	select SYSLOG_REGISTER
 	---help---
 		Build in support to use a file to collect SYSLOG output.  File SYSLOG
 		channels differ from other SYSLOG channels in that they cannot be
@@ -375,4 +378,9 @@ config SYSLOG_IOCTL
 		commands are SYSLOGIOC_SETFILTER/SYSLOGIOC_GETCHANNELS, which can be
 		used to set the enable status of different channels
 
+config SYSLOG_REGISTER
+	bool "Register syslog channel support"
+	---help---
+		This option will support register the syslog channel dynamically.
+
 endmenu # System logging

drivers/syslog/syslog.h

@@ -47,7 +47,11 @@ extern "C"
  * g_default_channel.
  */
 
-EXTERN FAR syslog_channel_t *g_syslog_channel[CONFIG_SYSLOG_MAX_CHANNELS];
+EXTERN FAR syslog_channel_t *
+#ifndef CONFIG_SYSLOG_REGISTER
+const
+#endif
+g_syslog_channel[CONFIG_SYSLOG_MAX_CHANNELS];
 
 /****************************************************************************
  * Public Function Prototypes

drivers/syslog/syslog_channel.c

@@ -191,8 +191,11 @@ static syslog_channel_t g_default_channel =
 
 /* This is the current syslog channel in use */
 
-FAR syslog_channel_t
-*g_syslog_channel[CONFIG_SYSLOG_MAX_CHANNELS] =
+FAR syslog_channel_t *
+#ifndef CONFIG_SYSLOG_REGISTER
+const
+#endif
+g_syslog_channel[CONFIG_SYSLOG_MAX_CHANNELS] =
 {
 #if defined(CONFIG_SYSLOG_DEFAULT)
   &g_default_channel,
@@ -272,6 +275,7 @@ static ssize_t syslog_default_write(FAR syslog_channel_t *channel,
  *
  ****************************************************************************/
 
+#ifdef CONFIG_SYSLOG_REGISTER
 int syslog_channel_register(FAR syslog_channel_t *channel)
 {
 #if (CONFIG_SYSLOG_MAX_CHANNELS != 1)
@@ -369,3 +373,4 @@ int syslog_channel_unregister(FAR syslog_channel_t *channel)
 
   return -EINVAL;
 }
+#endif