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x86/bug: Implement WARN_ONCE() 

Implement WARN_ONCE like WARN using BUGFLAG_ONCE.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251110115758.339309119@infradead.org
This commit is contained in:
Peter Zijlstra 2025-06-02 15:08:30 +02:00
parent 5b472b6e5b
commit 11bb4944f0
2 changed files with 11 additions and 0 deletions
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9
arch/x86/include/asm/bug.h
View File

@ -178,6 +178,15 @@ do { \
#define __WARN_printf(taint, fmt, arg...) \
__WARN_print_arg(BUGFLAG_TAINT(taint), fmt, ## arg)
#define WARN_ONCE(cond, format, arg...) ({ \
int __ret_warn_on = !!(cond); \
if (unlikely(__ret_warn_on)) { \
__WARN_print_arg(BUGFLAG_ONCE|BUGFLAG_TAINT(TAINT_WARN),\
format, ## arg); \
} \
__ret_warn_on; \
})
#endif /* HAVE_ARCH_BUG_FORMAT_ARGS */
#include <asm-generic/bug.h>

2
include/asm-generic/bug.h
View File

@ -180,8 +180,10 @@ extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
DO_ONCE_LITE_IF(condition, WARN_ON, 1)
#endif
#ifndef WARN_ONCE
#define WARN_ONCE(condition, format...) \
DO_ONCE_LITE_IF(condition, WARN, 1, format)
#endif
#define WARN_TAINT_ONCE(condition, taint, format...) \
DO_ONCE_LITE_IF(condition, WARN_TAINT, 1, taint, format)