These are useful as a less verbose alternative to WARN_ONCE, which also
prints a stack trace if possible.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
include/linux/printk.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/include/linux/printk.h b/include/linux/printk.h
index 2fd6551e0ccb..a9d1b05f6f0f 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -94,6 +94,15 @@ static inline int dev_err_probe(struct device *dev, int err, const char *fmt,
(level) <= LOGLEVEL ? pr_print((level), (format), ##args) : 0; \
})
+#define __pr_printk_once(level, format, args...) do { \
+ static bool __print_once; \
+ \
+ if (!__print_once && (level) <= LOGLEVEL) { \
+ __print_once = true; \
+ pr_print((level), (format), ##args); \
+ } \
+} while (0)
+
#ifndef pr_fmt
#define pr_fmt(fmt) fmt
#endif
@@ -110,7 +119,18 @@ static inline int dev_err_probe(struct device *dev, int err, const char *fmt,
#define pr_vdebug(fmt, arg...) __pr_printk(8, pr_fmt(fmt), ##arg)
#define pr_cont(fmt, arg...) __pr_printk(-1, fmt, ##arg)
+#define pr_emerg_once(fmt, arg...) __pr_printk_once(0, pr_fmt(fmt), ##arg)
+#define pr_alert_once(fmt, arg...) __pr_printk_once(1, pr_fmt(fmt), ##arg)
+#define pr_crit_once(fmt, arg...) __pr_printk_once(2, pr_fmt(fmt), ##arg)
+#define pr_err_once(fmt, arg...) __pr_printk_once(3, pr_fmt(fmt), ##arg)
+#define pr_warning_once(fmt, arg...) __pr_printk_once(4, pr_fmt(fmt), ##arg)
+#define pr_notice_once(fmt, arg...) __pr_printk_once(5, pr_fmt(fmt), ##arg)
+#define pr_info_once(fmt, arg...) __pr_printk_once(6, pr_fmt(fmt), ##arg)
+#define pr_debug_once(fmt, arg...) __pr_printk_once(7, pr_fmt(fmt), ##arg)
+#define pr_vdebug_once(fmt, arg...) __pr_printk_once(8, pr_fmt(fmt), ##arg)
+
#define pr_warn pr_warning
+#define pr_warn_once pr_warning_once
int memory_display(const void *addr, loff_t offs, unsigned nbytes, int size,
int swab);
--
2.30.2
