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Commit 6c231b7b authored by Ravikiran G Thirumalai's avatar Ravikiran G Thirumalai Committed by Linus Torvalds
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[PATCH] Additions to .data.read_mostly section 



Mark variables which are usually accessed for reads with __readmostly.

Signed-off-by: default avatarAlok N Kataria <alokk@calsoftinc.com>
Signed-off-by: default avatarShai Fultheim <shai@scalex86.org>
Signed-off-by: default avatarRavikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 39ed3fde

arch/i386/kernel/io_apic.c

+5 −5
Original line number Diff line number Diff line
@@ -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 */

arch/i386/kernel/timers/timer_hpet.c

+1 −1
Original line number Diff line number Diff line
@@ -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 */

arch/i386/mm/discontig.c

+4 −4
Original line number Diff line number Diff line
@@ -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)

arch/i386/mm/init.c

+1 −1
Original line number Diff line number Diff line
@@ -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

arch/x86_64/kernel/genapic.c

+1 −1
Original line number Diff line number Diff line
@@ -25,7 +25,7 @@ 
#endif



/* which logical CPU number maps to which CPU (physical APIC ID) */

u8 x86_cpu_to_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };

u8 x86_cpu_to_apicid[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = BAD_APICID };

EXPORT_SYMBOL(x86_cpu_to_apicid);

u8 x86_cpu_to_log_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };