Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fix from Ingo Molnar:
 "This fixes the preemption-count imbalance crash reported by Owen
  Kibel"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mce: Fix CMCI preemption bugs

2 files changed, 10 insertions, 12 deletions

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index eeee23ff75ef..68317c80de7f 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -598,7 +598,6 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 {
         struct mce m;
         int i;
-        unsigned long *v;
 
         this_cpu_inc(mce_poll_count);
 
@@ -618,8 +617,7 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
                 if (!(m.status & MCI_STATUS_VAL))
                         continue;
 
-                v = &get_cpu_var(mce_polled_error);
-                set_bit(0, v);
+                this_cpu_write(mce_polled_error, 1);
                 /*
                  * Uncorrected or signalled events are handled by the exception
                  * handler when it is enabled, so don't process those here.
diff --git a/arch/x86/kernel/cpu/mcheck/mce_intel.c b/arch/x86/kernel/cpu/mcheck/mce_intel.c
index 3bdb95ae8c43..9a316b21df8b 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_intel.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_intel.c
@@ -42,7 +42,7 @@ static DEFINE_PER_CPU(mce_banks_t, mce_banks_owned);
  * cmci_discover_lock protects against parallel discovery attempts
  * which could race against each other.
  */
-static DEFINE_RAW_SPINLOCK(cmci_discover_lock);
+static DEFINE_SPINLOCK(cmci_discover_lock);
 
 #define CMCI_THRESHOLD          1
 #define CMCI_POLL_INTERVAL      (30 * HZ)
@@ -144,14 +144,14 @@ static void cmci_storm_disable_banks(void)
         int bank;
         u64 val;
 
-        raw_spin_lock_irqsave(&cmci_discover_lock, flags);
+        spin_lock_irqsave(&cmci_discover_lock, flags);
         owned = __get_cpu_var(mce_banks_owned);
         for_each_set_bit(bank, owned, MAX_NR_BANKS) {
                 rdmsrl(MSR_IA32_MCx_CTL2(bank), val);
                 val &= ~MCI_CTL2_CMCI_EN;
                 wrmsrl(MSR_IA32_MCx_CTL2(bank), val);
         }
-        raw_spin_unlock_irqrestore(&cmci_discover_lock, flags);
+        spin_unlock_irqrestore(&cmci_discover_lock, flags);
 }
 
 static bool cmci_storm_detect(void)
@@ -211,7 +211,7 @@ static void cmci_discover(int banks)
         int i;
         int bios_wrong_thresh = 0;
 
-        raw_spin_lock_irqsave(&cmci_discover_lock, flags);
+        spin_lock_irqsave(&cmci_discover_lock, flags);
         for (i = 0; i < banks; i++) {
                 u64 val;
                 int bios_zero_thresh = 0;
@@ -266,7 +266,7 @@ static void cmci_discover(int banks)
                         WARN_ON(!test_bit(i, __get_cpu_var(mce_poll_banks)));
                 }
         }
-        raw_spin_unlock_irqrestore(&cmci_discover_lock, flags);
+        spin_unlock_irqrestore(&cmci_discover_lock, flags);
         if (mca_cfg.bios_cmci_threshold && bios_wrong_thresh) {
                 pr_info_once(
                         "bios_cmci_threshold: Some banks do not have valid thresholds set\n");
@@ -316,10 +316,10 @@ void cmci_clear(void)
 
         if (!cmci_supported(&banks))
                 return;
-        raw_spin_lock_irqsave(&cmci_discover_lock, flags);
+        spin_lock_irqsave(&cmci_discover_lock, flags);
         for (i = 0; i < banks; i++)
                 __cmci_disable_bank(i);
-        raw_spin_unlock_irqrestore(&cmci_discover_lock, flags);
+        spin_unlock_irqrestore(&cmci_discover_lock, flags);
 }
 
 static void cmci_rediscover_work_func(void *arg)
@@ -360,9 +360,9 @@ void cmci_disable_bank(int bank)
         if (!cmci_supported(&banks))
                 return;
 
-        raw_spin_lock_irqsave(&cmci_discover_lock, flags);
+        spin_lock_irqsave(&cmci_discover_lock, flags);
         __cmci_disable_bank(bank);
-        raw_spin_unlock_irqrestore(&cmci_discover_lock, flags);
+        spin_unlock_irqrestore(&cmci_discover_lock, flags);
 }
 
 static void intel_init_cmci(void)