From f697cb00afa90b68748f246540270b5865c801ba Mon Sep 17 00:00:00 2001
From: Juergen Gross <jgross@suse.com>
Date: Fri, 25 Nov 2022 07:32:48 +0100
Subject: [PATCH] x86/xen: mark xen_pv_play_dead() as __noreturn
Mark xen_pv_play_dead() and related to that xen_cpu_bringup_again()
as "__noreturn".
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221125063248.30256-3-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
---
arch/x86/xen/smp.h | 2 +-
arch/x86/xen/smp_pv.c | 4 ++--
tools/objtool/check.c | 1 +
3 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/x86/xen/smp.h b/arch/x86/xen/smp.h
index 6e90a312067b5..22fb982ff9713 100644
--- a/arch/x86/xen/smp.h
+++ b/arch/x86/xen/smp.h
@@ -21,7 +21,7 @@ void xen_smp_send_reschedule(int cpu);
void xen_smp_send_call_function_ipi(const struct cpumask *mask);
void xen_smp_send_call_function_single_ipi(int cpu);
-void xen_cpu_bringup_again(unsigned long stack);
+void __noreturn xen_cpu_bringup_again(unsigned long stack);
struct xen_common_irq {
int irq;
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
index a97b0505a4834..a9cf8c8fa074c 100644
--- a/arch/x86/xen/smp_pv.c
+++ b/arch/x86/xen/smp_pv.c
@@ -381,7 +381,7 @@ static void xen_pv_cpu_die(unsigned int cpu)
}
}
-static void xen_pv_play_dead(void) /* used only with HOTPLUG_CPU */
+static void __noreturn xen_pv_play_dead(void) /* used only with HOTPLUG_CPU */
{
play_dead_common();
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(smp_processor_id()), NULL);
@@ -400,7 +400,7 @@ static void xen_pv_cpu_die(unsigned int cpu)
BUG();
}
-static void xen_pv_play_dead(void)
+static void __noreturn xen_pv_play_dead(void)
{
BUG();
}
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 4b7c8b33069e5..68e87b45caefc 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -186,6 +186,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"snp_abort",
"stop_this_cpu",
"usercopy_abort",
+ "xen_cpu_bringup_again",
"xen_start_kernel",
};