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Message-Id: <20221125190948.2062-2-linux@weissschuh.net>
Date: Fri, 25 Nov 2022 20:09:46 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
linux-pm@...r.kernel.org, Petr Mladek <pmladek@...e.com>,
Sergey Senozhatsky <senozhatsky@...omium.org>,
Andy Whitcroft <apw@...onical.com>,
Joe Perches <joe@...ches.com>
Cc: Thomas Weißschuh <linux@...ssschuh.net>,
linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
Dwaipayan Ray <dwaipayanray1@...il.com>,
Lukas Bulwahn <lukas.bulwahn@...il.com>
Subject: [PATCH v2 1/3] printk: introduce new macros pr_<level>_cont()
These macros emit continuation messages with explicit levels.
In case the continuation is logged separately from the original message
it will retain its level instead of falling back to KERN_DEFAULT.
This remedies the issue that logs filtered by level contain stray
continuation messages without context.
Suggested-by: Petr Mladek <pmladek@...e.com>
Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
include/linux/printk.h | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/include/linux/printk.h b/include/linux/printk.h
index 8c81806c2e99..8f564c38f121 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -537,6 +537,8 @@ struct pi_entry {
* This macro expands to a printk with KERN_CONT loglevel. It should only be
* used when continuing a log message with no newline ('\n') enclosed. Otherwise
* it defaults back to KERN_DEFAULT loglevel.
+ *
+ * Use the dedicated pr_<level>_cont() macros instead.
*/
#define pr_cont(fmt, ...) \
printk(KERN_CONT fmt, ##__VA_ARGS__)
@@ -701,6 +703,27 @@ do { \
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
#endif
+/*
+ * Print a continuation message with level. In case the continuation is split
+ * from the main message it preserves the level.
+ */
+
+#define pr_emerg_cont(fmt, ...) \
+ printk(KERN_EMERG KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_alert_cont(fmt, ...) \
+ printk(KERN_ALERT KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_crit_cont(fmt, ...) \
+ printk(KERN_CRIT KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_err_cont(fmt, ...) \
+ printk(KERN_ERR KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_warn_cont(fmt, ...) \
+ printk(KERN_WARN KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_notice_cont(fmt, ...) \
+ printk(KERN_NOTICE KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_info_cont(fmt, ...) \
+ printk(KERN_INFO KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
+/* no pr_debug_ratelimited, it doesn't make sense with CONFIG_DYNAMIC_DEBUG. */
+
extern const struct file_operations kmsg_fops;
enum {
--
2.38.1
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