From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH] include: <asm-generic/bug.h>: implement WARN_ON_ONCE
Date: Mon, 31 Jan 2022 08:53:50 +0100 [thread overview]
Message-ID: <20220131075350.1869535-1-a.fatoum@pengutronix.de> (raw)
We have WARN_ON and WARN_ONCE. Add WARN_ON_ONCE as well to accommodate
Linux driver code using it.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
include/asm-generic/bug.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index f20e1b4d65ac..5d0a458eae74 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -50,4 +50,16 @@
} \
unlikely(__ret_warn_once); \
})
+
+#define WARN_ON_ONCE(condition) ({ \
+ static int __warned; \
+ int __ret_warn_once = !!(condition); \
+ \
+ if (unlikely(__ret_warn_once && !__warned)) { \
+ __warned = 1; \
+ __WARN(); \
+ } \
+ unlikely(__ret_warn_once); \
+})
+
#endif
--
2.30.2
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next reply other threads:[~2022-01-31 7:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-31 7:53 Ahmad Fatoum [this message]
2022-01-31 9:43 ` Sascha Hauer
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