[PATCH 08/12] Arm/GIC: add noreturn in a few more places

[Jan Beulich <jbeulich@suse.com>]

LPI related functions having just BUG() in them are disliked by Misra /
Eclair, as long as they don't also have a noreturn attribute.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
From its description "Unreachability caused by calls to the following
functions or macros is deliberate and there is no risk of code being
unexpectedly left out." I would have expected the respective entry in
deviations.ecl to cover all of these cases, but clearly that isn't the
case.

Of course having noreturn on functions returning non-void is somewhat odd.

--- a/xen/arch/arm/gic-v2.c
+++ b/xen/arch/arm/gic-v2.c
@@ -1315,7 +1315,7 @@ static int __init gicv2_init(void)
     return 0;
 }
 
-static void gicv2_do_LPI(unsigned int lpi)
+static void noreturn gicv2_do_LPI(unsigned int lpi)
 {
     /* No LPIs in a GICv2 */
     BUG();
--- a/xen/arch/arm/include/asm/gic_v3_its.h
+++ b/xen/arch/arm/include/asm/gic_v3_its.h
@@ -229,7 +229,7 @@ static inline unsigned int vgic_v3_its_c
     return 0;
 }
 
-static inline void gicv3_do_LPI(unsigned int lpi)
+static inline void noreturn gicv3_do_LPI(unsigned int lpi)
 {
     /* We don't enable LPIs without an ITS. */
     BUG();
--- a/xen/arch/arm/vgic-v2.c
+++ b/xen/arch/arm/vgic-v2.c
@@ -718,14 +718,15 @@ static void vgic_v2_domain_free(struct d
     /* Nothing to be cleanup for this driver */
 }
 
-static struct pending_irq *vgic_v2_lpi_to_pending(struct domain *d,
-                                                  unsigned int vlpi)
+static struct pending_irq *noreturn vgic_v2_lpi_to_pending(struct domain *d,
+                                                           unsigned int vlpi)
 {
     /* Dummy function, no LPIs on a VGICv2. */
     BUG();
 }
 
-static int vgic_v2_lpi_get_priority(struct domain *d, unsigned int vlpi)
+static int noreturn vgic_v2_lpi_get_priority(struct domain *d,
+                                             unsigned int vlpi)
 {
     /* Dummy function, no LPIs on a VGICv2. */
     BUG();