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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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18
include/linux/bug.h
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@ -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 */