[PATCH 8/8] x86/traps: Convert pv_trap_init() to being an initcall

[Andrew Cooper <andrew.cooper3@citrix.com>]

With most of pv_trap_init() being done at build time, opening of NMI_SOFTIRQ
can be a regular initcall, simplifying trap_init().

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Roger Pau Monné <roger.pau@citrix.com>
---
 xen/arch/x86/include/asm/pv/traps.h | 4 ----
 xen/arch/x86/pv/traps.c             | 5 ++++-
 xen/arch/x86/traps.c                | 2 --
 3 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/xen/arch/x86/include/asm/pv/traps.h b/xen/arch/x86/include/asm/pv/traps.h
index 404f5b169ca8..8c31d5a793c5 100644
--- a/xen/arch/x86/include/asm/pv/traps.h
+++ b/xen/arch/x86/include/asm/pv/traps.h
@@ -14,8 +14,6 @@
 
 #include <public/xen.h>
 
-void pv_trap_init(void);
-
 int pv_raise_nmi(struct vcpu *v);
 
 int pv_emulate_privileged_op(struct cpu_user_regs *regs);
@@ -32,8 +30,6 @@ static inline bool pv_trap_callback_registered(const struct vcpu *v,
 
 #include <xen/errno.h>
 
-static inline void pv_trap_init(void) {}
-
 static inline int pv_raise_nmi(struct vcpu *v) { return -EOPNOTSUPP; }
 
 static inline int pv_emulate_privileged_op(struct cpu_user_regs *regs) { return 0; }
diff --git a/xen/arch/x86/pv/traps.c b/xen/arch/x86/pv/traps.c
index 932800555bca..c3c0976c440f 100644
--- a/xen/arch/x86/pv/traps.c
+++ b/xen/arch/x86/pv/traps.c
@@ -141,10 +141,13 @@ static void cf_check nmi_softirq(void)
     *v_ptr = NULL;
 }
 
-void __init pv_trap_init(void)
+static int __init cf_check pv_trap_init(void)
 {
     open_softirq(NMI_SOFTIRQ, nmi_softirq);
+
+    return 0;
 }
+__initcall(pv_trap_init);
 
 /*
  * Deliver NMI to PV guest. Return 0 on success.
diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index 5f6c9def5afb..454e0d51c596 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -2138,8 +2138,6 @@ void __init trap_init(void)
     /* Replace early pagefault with real pagefault handler. */
     _update_gate_addr_lower(&bsp_idt[X86_EXC_PF], entry_PF);
 
-    pv_trap_init();
-
     init_ler();
 
     /* Cache {,compat_}gdt_l1e now that physically relocation is done. */
-- 
2.39.5