[PATCH 1/5] x86/nmi: Drop {reserve,release}_lapic_nmi()

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

With Oprofile support dropped, there are no more users of these.  Drop them.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <jbeulich@suse.com>
CC: Roger Pau Monné <roger@xenproject.org>
CC: Teddy Astie <teddy.astie@vates.tech>
---
 xen/arch/x86/include/asm/apic.h |  2 --
 xen/arch/x86/nmi.c              | 50 ---------------------------------
 2 files changed, 52 deletions(-)

diff --git a/xen/arch/x86/include/asm/apic.h b/xen/arch/x86/include/asm/apic.h
index 918f1cee3567..f30d57ad22c5 100644
--- a/xen/arch/x86/include/asm/apic.h
+++ b/xen/arch/x86/include/asm/apic.h
@@ -174,8 +174,6 @@ extern void setup_boot_APIC_clock (void);
 extern void setup_secondary_APIC_clock (void);
 extern void setup_apic_nmi_watchdog (void);
 extern void disable_lapic_nmi_watchdog(void);
-extern int reserve_lapic_nmi(void);
-extern void release_lapic_nmi(void);
 extern void self_nmi(void);
 extern void disable_timer_nmi_watchdog(void);
 extern void enable_timer_nmi_watchdog(void);
diff --git a/xen/arch/x86/nmi.c b/xen/arch/x86/nmi.c
index 91f95fe6d080..616bfdbc9029 100644
--- a/xen/arch/x86/nmi.c
+++ b/xen/arch/x86/nmi.c
@@ -89,20 +89,6 @@ static int __init cf_check parse_watchdog_timeout(const char *s)
 }
 custom_param("watchdog_timeout", parse_watchdog_timeout);
 
-/*
- * lapic_nmi_owner tracks the ownership of the lapic NMI hardware:
- * - it may be reserved by some other driver, or not
- * - when not reserved by some other driver, it may be used for
- *   the NMI watchdog, or not
- *
- * This is maintained separately from nmi_active because the NMI
- * watchdog may also be driven from the I/O APIC timer.
- */
-static DEFINE_SPINLOCK(lapic_nmi_owner_lock);
-static unsigned int lapic_nmi_owner;
-#define LAPIC_NMI_WATCHDOG	(1<<0)
-#define LAPIC_NMI_RESERVED	(1<<1)
-
 /* nmi_active:
  * +1: the lapic NMI watchdog is active, but can be disabled
  *  0: the lapic NMI watchdog has not been set up, and cannot
@@ -239,41 +225,6 @@ void disable_lapic_nmi_watchdog(void)
     nmi_watchdog = NMI_NONE;
 }
 
-static void enable_lapic_nmi_watchdog(void)
-{
-    if (nmi_active < 0) {
-        nmi_watchdog = NMI_LOCAL_APIC;
-        setup_apic_nmi_watchdog();
-    }
-}
-
-int reserve_lapic_nmi(void)
-{
-    unsigned int old_owner;
-
-    spin_lock(&lapic_nmi_owner_lock);
-    old_owner = lapic_nmi_owner;
-    lapic_nmi_owner |= LAPIC_NMI_RESERVED;
-    spin_unlock(&lapic_nmi_owner_lock);
-    if (old_owner & LAPIC_NMI_RESERVED)
-        return -EBUSY;
-    if (old_owner & LAPIC_NMI_WATCHDOG)
-        disable_lapic_nmi_watchdog();
-    return 0;
-}
-
-void release_lapic_nmi(void)
-{
-    unsigned int new_owner;
-
-    spin_lock(&lapic_nmi_owner_lock);
-    new_owner = lapic_nmi_owner & ~LAPIC_NMI_RESERVED;
-    lapic_nmi_owner = new_owner;
-    spin_unlock(&lapic_nmi_owner_lock);
-    if (new_owner & LAPIC_NMI_WATCHDOG)
-        enable_lapic_nmi_watchdog();
-}
-
 /*
  * Activate the NMI watchdog via the local APIC.
  * Original code written by Keith Owens.
@@ -417,7 +368,6 @@ void setup_apic_nmi_watchdog(void)
         return;
     }
 
-    lapic_nmi_owner = LAPIC_NMI_WATCHDOG;
     nmi_active = 1;
 }
 
-- 
2.34.1