x86/mce: Cleanup timer mess

Use unsigned long for dealing with jiffies not int. Rename the
callback to something sensible. Use __this_cpu_read/write for
accessing per cpu data.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Borislav Petkov <borislav.petkov@amd.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 16 insertions, 15 deletions

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 5f793e6c854b..98003bfc5556 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1243,15 +1243,15 @@ void mce_log_therm_throt_event(__u64 status)
  * poller finds an MCE, poll 2x faster.  When the poller finds no more
  * errors, poll 2x slower (up to check_interval seconds).
  */
-static int check_interval = 5 * 60; /* 5 minutes */
+static unsigned long check_interval = 5 * 60; /* 5 minutes */
 
-static DEFINE_PER_CPU(int, mce_next_interval); /* in jiffies */
+static DEFINE_PER_CPU(unsigned long, mce_next_interval); /* in jiffies */
 static DEFINE_PER_CPU(struct timer_list, mce_timer);
 
-static void mce_start_timer(unsigned long data)
+static void mce_timer_fn(unsigned long data)
 {
-        struct timer_list *t = &per_cpu(mce_timer, data);
-        int *n;
+        struct timer_list *t = &__get_cpu_var(mce_timer);
+        unsigned long iv;
 
         WARN_ON(smp_processor_id() != data);
 
@@ -1264,13 +1264,14 @@ static void mce_start_timer(unsigned long data)
          * Alert userspace if needed.  If we logged an MCE, reduce the
          * polling interval, otherwise increase the polling interval.
          */
-        n = &__get_cpu_var(mce_next_interval);
+        iv = __this_cpu_read(mce_next_interval);
         if (mce_notify_irq())
-                *n = max(*n/2, HZ/100);
+                iv = max(iv, (unsigned long) HZ/100);
         else
-                *n = min(*n*2, (int)round_jiffies_relative(check_interval*HZ));
+                iv = min(iv * 2, round_jiffies_relative(check_interval * HZ));
+        __this_cpu_write(mce_next_interval, iv);
 
-        t->expires = jiffies + *n;
+        t->expires = jiffies + iv;
         add_timer_on(t, smp_processor_id());
 }
 
@@ -1511,17 +1512,17 @@ static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
 static void __mcheck_cpu_init_timer(void)
 {
         struct timer_list *t = &__get_cpu_var(mce_timer);
-        int *n = &__get_cpu_var(mce_next_interval);
+        unsigned long iv = __this_cpu_read(mce_next_interval);
 
-        setup_timer(t, mce_start_timer, smp_processor_id());
+        setup_timer(t, mce_timer_fn, smp_processor_id());
 
         if (mce_ignore_ce)
                 return;
 
-        *n = check_interval * HZ;
-        if (!*n)
+        __this_cpu_write(mce_next_interval, iv);
+        if (!iv)
                 return;
-        t->expires = round_jiffies(jiffies + *n);
+        t->expires = round_jiffies(jiffies + iv);
         add_timer_on(t, smp_processor_id());
 }
 
@@ -2231,7 +2232,7 @@ mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
         case CPU_DOWN_FAILED_FROZEN:
                 if (!mce_ignore_ce && check_interval) {
                         t->expires = round_jiffies(jiffies +
-                                           __get_cpu_var(mce_next_interval));
+                                        per_cpu(mce_next_interval, cpu));
                         add_timer_on(t, cpu);
                 }
                 smp_call_function_single(cpu, mce_reenable_cpu, &action, 1);