[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>
diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index 4a59404..0e727e6 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -78,7 +78,7 @@
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 @@
}
/* 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 @@
* 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 @@
#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 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 6dbb29f..d973a8b 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 6711ce3..244d8ec 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 @@
* 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 @@
* 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 9edfc05..2ebaf75 100644
--- a/arch/i386/mm/init.c
+++ b/arch/i386/mm/init.c
@@ -393,7 +393,7 @@
}
static int disable_nx __initdata = 0;
-u64 __supported_pte_mask = ~_PAGE_NX;
+u64 __supported_pte_mask __read_mostly = ~_PAGE_NX;
/*
* noexec = on|off