bug.h: introduce WARN_ONCE
Add WARN_ONCE definition to allow single time notification
of warnings to the user.
Taken from Linux kernel (4.17) with slight changes
(Removed __section(.data.once))
Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
[trini: Drop the musb and dwc3 compat versions]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/usb/dwc3/linux-compat.h b/drivers/usb/dwc3/linux-compat.h
index 35850f9..8279376 100644
--- a/drivers/usb/dwc3/linux-compat.h
+++ b/drivers/usb/dwc3/linux-compat.h
@@ -11,7 +11,6 @@
#ifndef __DWC3_LINUX_COMPAT__
#define __DWC3_LINUX_COMPAT__
-#define WARN(val, format, arg...) debug(format, ##arg)
#define dev_WARN(dev, format, arg...) debug(format, ##arg)
static inline size_t strlcat(char *dest, const char *src, size_t n)
diff --git a/drivers/usb/musb-new/linux-compat.h b/drivers/usb/musb-new/linux-compat.h
index 7bb53d2..f366ae5 100644
--- a/drivers/usb/musb-new/linux-compat.h
+++ b/drivers/usb/musb-new/linux-compat.h
@@ -5,12 +5,6 @@
#include <linux/list.h>
#include <linux/compat.h>
-#define WARN(condition, fmt, args...) ({ \
- int ret_warn = !!condition; \
- if (ret_warn) \
- printf(fmt, ##args); \
- ret_warn; })
-
#define device_init_wakeup(dev, a) do {} while (0)
#define platform_data device_data
diff --git a/include/linux/bug.h b/include/linux/bug.h
index f07bb71..29f8416 100644
--- a/include/linux/bug.h
+++ b/include/linux/bug.h
@@ -20,6 +20,13 @@
unlikely(__ret_warn_on); \
})
+#define WARN(condition, format...) ({ \
+ int __ret_warn_on = !!(condition); \
+ if (unlikely(__ret_warn_on)) \
+ printf(format); \
+ unlikely(__ret_warn_on); \
+})
+
#define WARN_ON_ONCE(condition) ({ \
static bool __warned; \
int __ret_warn_once = !!(condition); \
@@ -31,4 +38,15 @@
unlikely(__ret_warn_once); \
})
+#define WARN_ONCE(condition, format...) ({ \
+ static bool __warned; \
+ int __ret_warn_once = !!(condition); \
+ \
+ if (unlikely(__ret_warn_once && !__warned)) { \
+ __warned = true; \
+ WARN(1, format); \
+ } \
+ unlikely(__ret_warn_once); \
+})
+
#endif /* _LINUX_BUG_H */