[PATCH] Additions to .data.read_mostly section

Mark variables which are usually accessed for reads with __readmostly.

Signed-off-by: Alok N Kataria <alokk@calsoftinc.com>
Signed-off-by: Shai Fultheim <shai@scalex86.org>
Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 11 insertions, 11 deletions

diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index 4a5940431579..0e727e6da5c9 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -78,7 +78,7 @@ static struct irq_pin_list {
         int apic, pin, next;
 } irq_2_pin[PIN_MAP_SIZE];
 
-int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1};
+int vector_irq[NR_VECTORS] __read_mostly = { [0 ... NR_VECTORS - 1] = -1};
 #ifdef CONFIG_PCI_MSI
 #define vector_to_irq(vector)   \
         (platform_legacy_irq(vector) ? vector : vector_irq[vector])
@@ -1119,7 +1119,7 @@ static inline int IO_APIC_irq_trigger(int irq)
 }
 
 /* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */
-u8 irq_vector[NR_IRQ_VECTORS] = { FIRST_DEVICE_VECTOR , 0 };
+u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 };
 
 int assign_irq_vector(int irq)
 {
@@ -1990,7 +1990,7 @@ static void set_ioapic_affinity_vector (unsigned int vector,
  * edge-triggered handler, without risking IRQ storms and other ugly
  * races.
  */
-static struct hw_interrupt_type ioapic_edge_type = {
+static struct hw_interrupt_type ioapic_edge_type __read_mostly = {
         .typename       = "IO-APIC-edge",
         .startup        = startup_edge_ioapic,
         .shutdown       = shutdown_edge_ioapic,
@@ -2003,7 +2003,7 @@ static struct hw_interrupt_type ioapic_edge_type = {
 #endif
 };
 
-static struct hw_interrupt_type ioapic_level_type = {
+static struct hw_interrupt_type ioapic_level_type __read_mostly = {
         .typename       = "IO-APIC-level",
         .startup        = startup_level_ioapic,
         .shutdown       = shutdown_level_ioapic,
@@ -2076,7 +2076,7 @@ static void ack_lapic_irq (unsigned int irq)
 
 static void end_lapic_irq (unsigned int i) { /* nothing */ }
 
-static struct hw_interrupt_type lapic_irq_type = {
+static struct hw_interrupt_type lapic_irq_type __read_mostly = {
         .typename       = "local-APIC-edge",
         .startup        = NULL, /* startup_irq() not used for IRQ0 */
         .shutdown       = NULL, /* shutdown_irq() not used for IRQ0 */
diff --git a/arch/i386/kernel/timers/timer_hpet.c b/arch/i386/kernel/timers/timer_hpet.c
index 6dbb29f834e8..d973a8b681fd 100644
--- a/arch/i386/kernel/timers/timer_hpet.c
+++ b/arch/i386/kernel/timers/timer_hpet.c
@@ -19,7 +19,7 @@
 #include <asm/hpet.h>
 
 static unsigned long hpet_usec_quotient __read_mostly;  /* convert hpet clks to usec */
-static unsigned long tsc_hpet_quotient;         /* convert tsc to hpet clks */
+static unsigned long tsc_hpet_quotient __read_mostly;   /* convert tsc to hpet clks */
 static unsigned long hpet_last;         /* hpet counter value at last tick*/
 static unsigned long last_tsc_low;      /* lsb 32 bits of Time Stamp Counter */
 static unsigned long last_tsc_high;     /* msb 32 bits of Time Stamp Counter */
diff --git a/arch/i386/mm/discontig.c b/arch/i386/mm/discontig.c
index 6711ce3f6916..244d8ec66be2 100644
--- a/arch/i386/mm/discontig.c
+++ b/arch/i386/mm/discontig.c
@@ -37,7 +37,7 @@
 #include <asm/mmzone.h>
 #include <bios_ebda.h>
 
-struct pglist_data *node_data[MAX_NUMNODES];
+struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
 EXPORT_SYMBOL(node_data);
 bootmem_data_t node0_bdata;
 
@@ -49,8 +49,8 @@ bootmem_data_t node0_bdata;
  * 2) node_start_pfn   - the starting page frame number for a node
  * 3) node_end_pfn     - the ending page fram number for a node
  */
-unsigned long node_start_pfn[MAX_NUMNODES];
-unsigned long node_end_pfn[MAX_NUMNODES];
+unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly;
+unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly;
 
 
 #ifdef CONFIG_DISCONTIGMEM
@@ -66,7 +66,7 @@ unsigned long node_end_pfn[MAX_NUMNODES];
  *     physnode_map[4-7] = 1;
  *     physnode_map[8- ] = -1;
  */
-s8 physnode_map[MAX_ELEMENTS] = { [0 ... (MAX_ELEMENTS - 1)] = -1};
+s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1};
 EXPORT_SYMBOL(physnode_map);
 
 void memory_present(int nid, unsigned long start, unsigned long end)
diff --git a/arch/i386/mm/init.c b/arch/i386/mm/init.c
index 9edfc058b894..2ebaf75f732e 100644
--- a/arch/i386/mm/init.c
+++ b/arch/i386/mm/init.c
@@ -393,7 +393,7 @@ void zap_low_mappings (void)
 }
 
 static int disable_nx __initdata = 0;
-u64 __supported_pte_mask = ~_PAGE_NX;
+u64 __supported_pte_mask __read_mostly = ~_PAGE_NX;
 
 /*
  * noexec = on|off