log: allow for message continuation

Some drivers use macro pr_cont() for continuing a message sent via printk.
Hence if we want to convert printk messaging to using the logging system,
we must support continuation of log messages too.

As pr_cont() does not provide a message level we need a means of
remembering the last log level.

With the patch a pseudo log level LOGL_CONT as well as a pseudo log
category LOGC_CONT are introduced. Using these results in the application
of the same log level and category as in the previous log message.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

include/asm-generic/global_data.h

@@ -371,6 +371,18 @@ struct global_data {
 	 * while another message is being processed.
 	 */
 	bool processing_msg;
+	/**
+	 * @logc_prev: logging category of previous message
+	 *
+	 * This value is used as logging category for continuation messages.
+	 */
+	int logc_prev;
+	/**
+	 * @logl_pref: logging level of the previous message
+	 *
+	 * This value is used as logging level for continuation messages.
+	 */
+	int logl_prev;
 #endif
 #if CONFIG_IS_ENABLED(BLOBLIST)
 	/**