4 files changed, 53 insertions, 53 deletions

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 6dde0497efc7..3b413065c613 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -51,6 +51,7 @@
 #include <asm/mce.h>
 #include <asm/msr.h>
 #include <asm/reboot.h>
+#include <asm/set_memory.h>
 
 #include "mce-internal.h"
 
@@ -1051,6 +1052,48 @@ static int do_memory_failure(struct mce *m)
 	return ret;
 }
 
+#if defined(arch_unmap_kpfn) && defined(CONFIG_MEMORY_FAILURE)
+
+void arch_unmap_kpfn(unsigned long pfn)
+{
+	unsigned long decoy_addr;
+
+	/*
+	 * Unmap this page from the kernel 1:1 mappings to make sure
+	 * we don't log more errors because of speculative access to
+	 * the page.
+	 * We would like to just call:
+	 *	set_memory_np((unsigned long)pfn_to_kaddr(pfn), 1);
+	 * but doing that would radically increase the odds of a
+	 * speculative access to the posion page because we'd have
+	 * the virtual address of the kernel 1:1 mapping sitting
+	 * around in registers.
+	 * Instead we get tricky.  We create a non-canonical address
+	 * that looks just like the one we want, but has bit 63 flipped.
+	 * This relies on set_memory_np() not checking whether we passed
+	 * a legal address.
+	 */
+
+/*
+ * Build time check to see if we have a spare virtual bit. Don't want
+ * to leave this until run time because most developers don't have a
+ * system that can exercise this code path. This will only become a
+ * problem if/when we move beyond 5-level page tables.
+ *
+ * Hard code "9" here because cpp doesn't grok ilog2(PTRS_PER_PGD)
+ */
+#if PGDIR_SHIFT + 9 < 63
+	decoy_addr = (pfn << PAGE_SHIFT) + (PAGE_OFFSET ^ BIT(63));
+#else
+#error "no unused virtual bit available"
+#endif
+
+	if (set_memory_np(decoy_addr, 1))
+		pr_warn("Could not invalidate pfn=0x%lx from 1:1 map\n", pfn);
+
+}
+#endif
+
 /*
  * The actual machine check handler. This only handles real
  * exceptions when something got corrupted coming in through int 18.
diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index 9e314bcf67cc..40e28ed77fbf 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -201,8 +201,8 @@ static void smca_configure(unsigned int bank, unsigned int cpu)
 		wrmsr(smca_config, low, high);
 	}
 
-	/* Collect bank_info using CPU 0 for now. */
-	if (cpu)
+	/* Return early if this bank was already initialized. */
+	if (smca_banks[bank].hwid)
 		return;
 
 	if (rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) {
@@ -216,11 +216,6 @@ static void smca_configure(unsigned int bank, unsigned int cpu)
 	for (i = 0; i < ARRAY_SIZE(smca_hwid_mcatypes); i++) {
 		s_hwid = &smca_hwid_mcatypes[i];
 		if (hwid_mcatype == s_hwid->hwid_mcatype) {
-
-			WARN(smca_banks[bank].hwid,
-			     "Bank %s already initialized!\n",
-			     smca_get_name(s_hwid->bank_type));
-
 			smca_banks[bank].hwid = s_hwid;
 			smca_banks[bank].id = low;
 			smca_banks[bank].sysfs_id = s_hwid->count++;
@@ -776,24 +771,12 @@ static void __log_error(unsigned int bank, u64 status, u64 addr, u64 misc)
 	mce_log(&m);
 }
 
-static inline void __smp_deferred_error_interrupt(void)
-{
-	inc_irq_stat(irq_deferred_error_count);
-	deferred_error_int_vector();
-}
-
 asmlinkage __visible void __irq_entry smp_deferred_error_interrupt(void)
 {
 	entering_irq();
-	__smp_deferred_error_interrupt();
-	exiting_ack_irq();
-}
-
-asmlinkage __visible void __irq_entry smp_trace_deferred_error_interrupt(void)
-{
-	entering_irq();
 	trace_deferred_error_apic_entry(DEFERRED_ERROR_VECTOR);
-	__smp_deferred_error_interrupt();
+	inc_irq_stat(irq_deferred_error_count);
+	deferred_error_int_vector();
 	trace_deferred_error_apic_exit(DEFERRED_ERROR_VECTOR);
 	exiting_ack_irq();
 }
diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c
index d7cc190ae457..2da67b70ba98 100644
--- a/arch/x86/kernel/cpu/mcheck/therm_throt.c
+++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c
@@ -122,7 +122,7 @@ static struct attribute *thermal_throttle_attrs[] = {
 	NULL
 };
 
-static struct attribute_group thermal_attr_group = {
+static const struct attribute_group thermal_attr_group = {
 	.attrs	= thermal_throttle_attrs,
 	.name	= "thermal_throttle"
 };
@@ -390,26 +390,12 @@ static void unexpected_thermal_interrupt(void)
 
 static void (*smp_thermal_vector)(void) = unexpected_thermal_interrupt;
 
-static inline void __smp_thermal_interrupt(void)
-{
-	inc_irq_stat(irq_thermal_count);
-	smp_thermal_vector();
-}
-
-asmlinkage __visible void __irq_entry
-smp_thermal_interrupt(struct pt_regs *regs)
-{
-	entering_irq();
-	__smp_thermal_interrupt();
-	exiting_ack_irq();
-}
-
-asmlinkage __visible void __irq_entry
-smp_trace_thermal_interrupt(struct pt_regs *regs)
+asmlinkage __visible void __irq_entry smp_thermal_interrupt(struct pt_regs *r)
 {
 	entering_irq();
 	trace_thermal_apic_entry(THERMAL_APIC_VECTOR);
-	__smp_thermal_interrupt();
+	inc_irq_stat(irq_thermal_count);
+	smp_thermal_vector();
 	trace_thermal_apic_exit(THERMAL_APIC_VECTOR);
 	exiting_ack_irq();
 }
diff --git a/arch/x86/kernel/cpu/mcheck/threshold.c b/arch/x86/kernel/cpu/mcheck/threshold.c
index bb0e75eed10a..5e7249e42f8f 100644
--- a/arch/x86/kernel/cpu/mcheck/threshold.c
+++ b/arch/x86/kernel/cpu/mcheck/threshold.c
@@ -17,24 +17,12 @@ static void default_threshold_interrupt(void)
 
 void (*mce_threshold_vector)(void) = default_threshold_interrupt;
 
-static inline void __smp_threshold_interrupt(void)
-{
-	inc_irq_stat(irq_threshold_count);
-	mce_threshold_vector();
-}
-
 asmlinkage __visible void __irq_entry smp_threshold_interrupt(void)
 {
 	entering_irq();
-	__smp_threshold_interrupt();
-	exiting_ack_irq();
-}
-
-asmlinkage __visible void __irq_entry smp_trace_threshold_interrupt(void)
-{
-	entering_irq();
 	trace_threshold_apic_entry(THRESHOLD_APIC_VECTOR);
-	__smp_threshold_interrupt();
+	inc_irq_stat(irq_threshold_count);
+	mce_threshold_vector();
 	trace_threshold_apic_exit(THRESHOLD_APIC_VECTOR);
 	exiting_ack_irq();
 }