i386: constify wd_ops

.. as they're, with a single exception, never written to.

[ tglx: arch/x86 adaptation ]

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 8 insertions, 6 deletions

diff --git a/arch/x86/kernel/cpu/perfctr-watchdog.c b/arch/x86/kernel/cpu/perfctr-watchdog.c
index 93fecd4b03de..54cdbf1a40f1 100644
--- a/arch/x86/kernel/cpu/perfctr-watchdog.c
+++ b/arch/x86/kernel/cpu/perfctr-watchdog.c
@@ -34,7 +34,7 @@ struct wd_ops {
         u64 checkbit;
 };
 
-static struct wd_ops *wd_ops;
+static const struct wd_ops *wd_ops;
 
 /* this number is calculated from Intel's MSR_P4_CRU_ESCR5 register and it's
  * offset from MSR_P4_BSU_ESCR0.  It will be the max for all platforms (for now)
@@ -317,7 +317,7 @@ static void single_msr_rearm(struct nmi_watchdog_ctlblk *wd, unsigned nmi_hz)
         write_watchdog_counter(wd->perfctr_msr, NULL, nmi_hz);
 }
 
-static struct wd_ops k7_wd_ops = {
+static const struct wd_ops k7_wd_ops = {
         .reserve = single_msr_reserve,
         .unreserve = single_msr_unreserve,
         .setup = setup_k7_watchdog,
@@ -380,7 +380,7 @@ static void p6_rearm(struct nmi_watchdog_ctlblk *wd, unsigned nmi_hz)
         write_watchdog_counter32(wd->perfctr_msr, NULL,nmi_hz);
 }
 
-static struct wd_ops p6_wd_ops = {
+static const struct wd_ops p6_wd_ops = {
         .reserve = single_msr_reserve,
         .unreserve = single_msr_unreserve,
         .setup = setup_p6_watchdog,
@@ -532,7 +532,7 @@ static void p4_rearm(struct nmi_watchdog_ctlblk *wd, unsigned nmi_hz)
         write_watchdog_counter(wd->perfctr_msr, NULL, nmi_hz);
 }
 
-static struct wd_ops p4_wd_ops = {
+static const struct wd_ops p4_wd_ops = {
         .reserve = p4_reserve,
         .unreserve = p4_unreserve,
         .setup = setup_p4_watchdog,
@@ -550,6 +550,8 @@ static struct wd_ops p4_wd_ops = {
 #define ARCH_PERFMON_NMI_EVENT_SEL      ARCH_PERFMON_UNHALTED_CORE_CYCLES_SEL
 #define ARCH_PERFMON_NMI_EVENT_UMASK    ARCH_PERFMON_UNHALTED_CORE_CYCLES_UMASK
 
+static struct wd_ops intel_arch_wd_ops;
+
 static int setup_intel_arch_watchdog(unsigned nmi_hz)
 {
         unsigned int ebx;
@@ -591,11 +593,11 @@ static int setup_intel_arch_watchdog(unsigned nmi_hz)
         wd->perfctr_msr = perfctr_msr;
         wd->evntsel_msr = evntsel_msr;
         wd->cccr_msr = 0;  //unused
-        wd_ops->checkbit = 1ULL << (eax.split.bit_width - 1);
+        intel_arch_wd_ops.checkbit = 1ULL << (eax.split.bit_width - 1);
         return 1;
 }
 
-static struct wd_ops intel_arch_wd_ops = {
+static struct wd_ops intel_arch_wd_ops __read_mostly = {
         .reserve = single_msr_reserve,
         .unreserve = single_msr_unreserve,
         .setup = setup_intel_arch_watchdog,