linux-kernel - [PATCH 7/9] s390/bug: Implement WARN

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Message-ID: <20251209121701.1856271-8-hca@linux.ibm.com>
Date: Tue,  9 Dec 2025 13:16:59 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Alexander Gordeev <agordeev@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>, Arnd Bergmann <arnd@...db.de>,
        Jens Remus <jremus@...ux.ibm.com>,
        Stefan Schulze Frielinghaus <stefansf@...ux.ibm.com>,
        Juergen Christ <jchrist@...ux.ibm.com>
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [PATCH 7/9] s390/bug: Implement WARN_ONCE()

This is the s390 variant of commit 11bb4944f014 ("x86/bug: Implement
WARN_ONCE()").

Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
---
 arch/s390/include/asm/bug.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/s390/include/asm/bug.h b/arch/s390/include/asm/bug.h
index f3aca691bae2..e6e8b492c0e7 100644
--- a/arch/s390/include/asm/bug.h
+++ b/arch/s390/include/asm/bug.h
@@ -104,6 +104,17 @@ 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;							\
+})
+
 #define HAVE_ARCH_BUG
 #define HAVE_ARCH_BUG_FORMAT
 #define HAVE_ARCH_BUG_FORMAT_ARGS
-- 
2.51.0