[Xen-devel] [PATCH 3/4] x86: replace remaining uses of __get_cpu_var()

["Jan Beulich" <JBeulich@xxxxxxxx>]

this_cpu() is shorter, and when there are multiple uses in a function
per_cpu() it's also more efficient.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/acpi/cpuidle_menu.c
+++ b/xen/arch/x86/acpi/cpuidle_menu.c
@@ -146,7 +146,7 @@ static inline int which_bucket(unsigned
 
 static inline s_time_t avg_intr_interval_us(void)
 {
-    struct menu_device *data = &__get_cpu_var(menu_devices);
+    struct menu_device *data = &this_cpu(menu_devices);
     s_time_t    duration, now;
     s_time_t    avg_interval;
     unsigned int irq_sum;
@@ -187,7 +187,7 @@ static unsigned int get_sleep_length_us(
 
 static int menu_select(struct acpi_processor_power *power)
 {
-    struct menu_device *data = &__get_cpu_var(menu_devices);
+    struct menu_device *data = &this_cpu(menu_devices);
     int i;
     s_time_t    io_interval;
 
@@ -239,7 +239,7 @@ static int menu_select(struct acpi_proce
 
 static void menu_reflect(struct acpi_processor_power *power)
 {
-    struct menu_device *data = &__get_cpu_var(menu_devices);
+    struct menu_device *data = &this_cpu(menu_devices);
     u64 new_factor;
 
     data->measured_us = power->last_residency;
@@ -294,7 +294,8 @@ static struct cpuidle_governor menu_gove
 struct cpuidle_governor *cpuidle_current_governor = &menu_governor;
 void menu_get_trace_data(u32 *expected, u32 *pred)
 {
-    struct menu_device *data = &__get_cpu_var(menu_devices);
+    const struct menu_device *data = &this_cpu(menu_devices);
+
     *expected = data->expected_us;
     *pred = data->predicted_us;
 }
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -651,7 +651,7 @@ void irq_move_cleanup_interrupt(struct c
         unsigned int irq;
         unsigned int irr;
         struct irq_desc *desc;
-        irq = __get_cpu_var(vector_irq)[vector];
+        irq = per_cpu(vector_irq, me)[vector];
 
         if ((int)irq < 0)
             continue;
@@ -690,7 +690,7 @@ void irq_move_cleanup_interrupt(struct c
         TRACE_3D(TRC_HW_IRQ_MOVE_CLEANUP,
                  irq, vector, smp_processor_id());
 
-        __get_cpu_var(vector_irq)[vector] = ~irq;
+        per_cpu(vector_irq, me)[vector] = ~irq;
         desc->arch.move_cleanup_count--;
 
         if ( desc->arch.move_cleanup_count == 0 )
@@ -822,7 +822,7 @@ void do_IRQ(struct cpu_user_regs *regs)
     uint32_t          tsc_in;
     struct irq_desc  *desc;
     unsigned int      vector = (u8)regs->entry_vector;
-    int irq = __get_cpu_var(vector_irq[vector]);
+    int               irq = this_cpu(vector_irq)[vector];
     struct cpu_user_regs *old_regs = set_irq_regs(regs);
     
     perfc_incr(irqs);
--- a/xen/include/asm-x86/irq.h
+++ b/xen/include/asm-x86/irq.h
@@ -68,12 +68,12 @@ DECLARE_PER_CPU(struct cpu_user_regs *,
 
 static inline struct cpu_user_regs *get_irq_regs(void)
 {
-       return __get_cpu_var(__irq_regs);
+       return this_cpu(__irq_regs);
 }
 
 static inline struct cpu_user_regs *set_irq_regs(struct cpu_user_regs 
*new_regs)
 {
-       struct cpu_user_regs *old_regs, **pp_regs = &__get_cpu_var(__irq_regs);
+       struct cpu_user_regs *old_regs, **pp_regs = &this_cpu(__irq_regs);
 
        old_regs = *pp_regs;
        *pp_regs = new_regs;





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