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bug.h: introduce WARN_ONCE

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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>
This commit is contained in:
Ramon Fried 2018-06-06 00:38:59 +03:00 • committed by Tom Rini
parent 46960ad6d0
commit 948f32c856
3 changed files with 18 additions and 7 deletions
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1
drivers/usb/dwc3/linux-compat.h
View file

@ -11,7 +11,6 @@
#ifndef __DWC3_LINUX_COMPAT__ #ifndef __DWC3_LINUX_COMPAT__
#define __DWC3_LINUX_COMPAT__ #define __DWC3_LINUX_COMPAT__
#define WARN(val, format, arg...) debug(format, ##arg)
#define dev_WARN(dev, 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) static inline size_t strlcat(char *dest, const char *src, size_t n)

6
drivers/usb/musb-new/linux-compat.h
View file

@ -5,12 +5,6 @@
#include <linux/list.h> #include <linux/list.h>
#include <linux/compat.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 device_init_wakeup(dev, a) do {} while (0)
#define platform_data device_data #define platform_data device_data

18
include/linux/bug.h
View file

@ -20,6 +20,13 @@
unlikely(__ret_warn_on); \ 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) ({ \ #define WARN_ON_ONCE(condition) ({ \
static bool __warned; \ static bool __warned; \
int __ret_warn_once = !!(condition); \ int __ret_warn_once = !!(condition); \
@ -31,4 +38,15 @@
unlikely(__ret_warn_once); \ 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 */ #endif /* _LINUX_BUG_H */