[SPARC64]: Add __read_mostly support.

Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 17 insertions, 21 deletions

diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index e5b9c7a27789..441fc2e52ce6 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -45,8 +45,8 @@ extern void calibrate_delay(void);
 /* Please don't make this stuff initdata!!!  --DaveM */
 static unsigned char boot_cpu_id;
 
-cpumask_t cpu_online_map = CPU_MASK_NONE;
-cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
+cpumask_t cpu_online_map = CPU_MASK_NONE __read_mostly;
+cpumask_t phys_cpu_present_map = CPU_MASK_NONE __read_mostly;
 static cpumask_t smp_commenced_mask;
 static cpumask_t cpu_callout_map;
 
@@ -155,7 +155,7 @@ void cpu_panic(void)
         panic("SMP bolixed\n");
 }
 
-static unsigned long current_tick_offset;
+static unsigned long current_tick_offset __read_mostly;
 
 /* This tick register synchronization scheme is taken entirely from
  * the ia64 port, see arch/ia64/kernel/smpboot.c for details and credit.
@@ -1193,8 +1193,8 @@ void smp_send_stop(void)
 {
 }
 
-unsigned long __per_cpu_base;
-unsigned long __per_cpu_shift;
+unsigned long __per_cpu_base __read_mostly;
+unsigned long __per_cpu_shift __read_mostly;
 
 EXPORT_SYMBOL(__per_cpu_base);
 EXPORT_SYMBOL(__per_cpu_shift);
diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c
index b40db389f90b..362b9c26871b 100644
--- a/arch/sparc64/kernel/time.c
+++ b/arch/sparc64/kernel/time.c
@@ -73,7 +73,7 @@ static __initdata struct sparc64_tick_ops dummy_tick_ops = {
         .get_tick       = dummy_get_tick,
 };
 
-struct sparc64_tick_ops *tick_ops = &dummy_tick_ops;
+struct sparc64_tick_ops *tick_ops __read_mostly = &dummy_tick_ops;
 
 #define TICK_PRIV_BIT   (1UL << 63)
 
@@ -195,7 +195,7 @@ static unsigned long tick_add_tick(unsigned long adj, unsigned long offset)
         return new_tick;
 }
 
-static struct sparc64_tick_ops tick_operations = {
+static struct sparc64_tick_ops tick_operations __read_mostly = {
         .init_tick      =       tick_init_tick,
         .get_tick       =       tick_get_tick,
         .get_compare    =       tick_get_compare,
@@ -276,7 +276,7 @@ static unsigned long stick_add_compare(unsigned long adj)
         return new_compare;
 }
 
-static struct sparc64_tick_ops stick_operations = {
+static struct sparc64_tick_ops stick_operations __read_mostly = {
         .init_tick      =       stick_init_tick,
         .get_tick       =       stick_get_tick,
         .get_compare    =       stick_get_compare,
@@ -422,7 +422,7 @@ static unsigned long hbtick_add_compare(unsigned long adj)
         return val;
 }
 
-static struct sparc64_tick_ops hbtick_operations = {
+static struct sparc64_tick_ops hbtick_operations __read_mostly = {
         .init_tick      =       hbtick_init_tick,
         .get_tick       =       hbtick_get_tick,
         .get_compare    =       hbtick_get_compare,
@@ -437,10 +437,9 @@ static struct sparc64_tick_ops hbtick_operations = {
  * NOTE: On SUN5 systems the ticker interrupt comes in using 2
  *       interrupts, one at level14 and one with softint bit 0.
  */
-unsigned long timer_tick_offset;
-unsigned long timer_tick_compare;
+unsigned long timer_tick_offset __read_mostly;
 
-static unsigned long timer_ticks_per_nsec_quotient;
+static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
 
 #define TICK_SIZE (tick_nsec / 1000)
 
@@ -464,7 +463,7 @@ static inline void timer_check_rtc(void)
 
 static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)
 {
-        unsigned long ticks, pstate;
+        unsigned long ticks, compare, pstate;
 
         write_seqlock(&xtime_lock);
 
@@ -483,14 +482,14 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)
                                      : "=r" (pstate)
                                      : "i" (PSTATE_IE));
 
-                timer_tick_compare = tick_ops->add_compare(timer_tick_offset);
+                compare = tick_ops->add_compare(timer_tick_offset);
                 ticks = tick_ops->get_tick();
 
                 /* Restore PSTATE_IE. */
                 __asm__ __volatile__("wrpr      %0, 0x0, %%pstate"
                                      : /* no outputs */
                                      : "r" (pstate));
-        } while (time_after_eq(ticks, timer_tick_compare));
+        } while (time_after_eq(ticks, compare));
 
         timer_check_rtc();
 
@@ -506,11 +505,6 @@ void timer_tick_interrupt(struct pt_regs *regs)
 
         do_timer(regs);
 
-        /*
-         * Only keep timer_tick_offset uptodate, but don't set TICK_CMPR.
-         */
-        timer_tick_compare = tick_ops->get_compare() + timer_tick_offset;
-
         timer_check_rtc();
 
         write_sequnlock(&xtime_lock);
diff --git a/arch/sparc64/kernel/vmlinux.lds.S b/arch/sparc64/kernel/vmlinux.lds.S
index 382fd6798bb9..950423da8a6a 100644
--- a/arch/sparc64/kernel/vmlinux.lds.S
+++ b/arch/sparc64/kernel/vmlinux.lds.S
@@ -32,6 +32,8 @@ SECTIONS
   .data1   : { *(.data1) }
   . = ALIGN(64);
   .data.cacheline_aligned : { *(.data.cacheline_aligned) }
+  . = ALIGN(64);
+  .data.read_mostly : { *(.data.read_mostly) }
   _edata  =  .;
   PROVIDE (edata = .);
   .fixup   : { *(.fixup) }
diff --git a/include/linux/cache.h b/include/linux/cache.h
index 2b66a36d85f0..f6b5a46c5f82 100644
--- a/include/linux/cache.h
+++ b/include/linux/cache.h
@@ -13,7 +13,7 @@
 #define SMP_CACHE_BYTES L1_CACHE_BYTES
 #endif
 
-#ifdef CONFIG_X86
+#if defined(CONFIG_X86) || defined(CONFIG_SPARC64)
 #define __read_mostly __attribute__((__section__(".data.read_mostly")))
 #else
 #define __read_mostly