linux-kernel - [PATCH 1/5] s390/ipl: Mark store_status as _

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Message-ID: <20251110132803.1520-1-thorsten.blum@linux.dev>
Date: Mon, 10 Nov 2025 14:27:51 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] s390/ipl: Mark store_status as __noreturn

store_status() performs a tail call (BR_EX) to the function passed as
the first parameter and does not return. Annotate the declaration with
the __noreturn attribute to improve compiler optimizations.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 arch/s390/include/asm/ipl.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h
index b0d00032479d..637b29bf8a6d 100644
--- a/arch/s390/include/asm/ipl.h
+++ b/arch/s390/include/asm/ipl.h
@@ -164,7 +164,7 @@ enum diag308_rc {
 };
 
 extern int diag308(unsigned long subcode, void *addr);
-extern void store_status(void (*fn)(void *), void *data);
+extern void __noreturn store_status(void (*fn)(void *), void *data);
 extern void lgr_info_log(void);
 
 #endif /* _ASM_S390_IPL_H */
-- 
2.51.1