[tip: objtool/core] x86/xen: mark xen_pv_play_dead() as __noreturn

[tip-bot2 for Juergen Gross]

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     1aff0d2658e5a5217d3168e06a90fbb99fa63e80
Gitweb:        https://git.kernel.org/tip/1aff0d2658e5a5217d3168e06a90fbb99fa63e80
Author:        Juergen Gross <jgross@xxxxxxxx>
AuthorDate:    Fri, 25 Nov 2022 07:32:48 +01:00
Committer:     Juergen Gross <jgross@xxxxxxxx>
CommitterDate: Tue, 17 Jan 2023 09:05:32 +01:00

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@xxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221125063248.30256-3-jgross@xxxxxxxx
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 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 6e90a31..22fb982 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 a97b050..a9cf8c8 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 4b7c8b3..68e87b4 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",
 	};