linux-kernel - [PATCH 5/5] s390/kdump: Mark __do_machine_kdump as _

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Message-ID: <20251110132803.1520-5-thorsten.blum@linux.dev>
Date: Mon, 10 Nov 2025 14:27:55 +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 5/5] s390/kdump: Mark __do_machine_kdump as __noreturn

__do_machine_kdump() ends by calling the non-returning function
disabled_wait() and therefore also never returns. Annotate it with the
__noreturn attribute to improve compiler optimizations.

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

diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
index d78e6e3d962f..ca51168500fe 100644
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -45,7 +45,7 @@ extern const unsigned long long relocate_kernel_len;
  * Reset the system, copy boot CPU registers to absolute zero,
  * and jump to the kdump image
  */
-static void __do_machine_kdump(void *data)
+static void __noreturn __do_machine_kdump(void *data)
 {
 	struct kimage *image = data;
 	purgatory_t purgatory;
-- 
2.51.1