[PATCH] mark several libata datastructures const

Hi,

the patch below marks several libata (and libata-driver) structures
const so that they end up in the .rodata segment and don't false-share
cachelines with things that get dirtied often.

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index 83467a0..cfbdd3f 100644 (file)
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -243,7 +243,7 @@ static const struct ata_port_operations ahci_ops = {
        .port_stop              = ahci_port_stop,
 };
 
-static struct ata_port_info ahci_port_info[] = {
+static const struct ata_port_info ahci_port_info[] = {
        /* board_ahci */
        {
                .sht            = &ahci_sht,

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 9f27e8d..11ed6fa 100644 (file)
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -605,7 +605,7 @@ void ata_rwcmd_protocol(struct ata_queued_cmd *qc)
        tf->command = ata_rw_cmds[index + lba48 + write];
 }
 
-static const char * xfer_mode_str[] = {
+static const char * const xfer_mode_str[] = {
        "UDMA/16",
        "UDMA/25",
        "UDMA/33",
@@ -2083,7 +2083,7 @@ static void ata_pr_blacklisted(const struct ata_port *ap,
                ap->id, dev->devno);
 }
 
-static const char * ata_dma_blacklist [] = {
+static const char * const ata_dma_blacklist [] = {
        "WDC AC11000H",
        "WDC AC22100H",
        "WDC AC32500H",

diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 3b4ca55..b21b885 100644 (file)
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -418,7 +418,7 @@ void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc,
        int i;
 
        /* Based on the 3ware driver translation table */
-       static unsigned char sense_table[][4] = {
+       static const unsigned char sense_table[][4] = {
                /* BBD|ECC|ID|MAR */
                {0xd1,          ABORTED_COMMAND, 0x00, 0x00},   // Device busy                  Aborted command
                /* BBD|ECC|ID */
@@ -449,7 +449,7 @@ void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc,
                {0x80,          MEDIUM_ERROR, 0x11, 0x04},      // Block marked bad               Medium error, unrecovered read error
                {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
        };
-       static unsigned char stat_table[][4] = {
+       static const unsigned char stat_table[][4] = {
                /* Must be first because BUSY means no other bits valid */
                {0x80,          ABORTED_COMMAND, 0x47, 0x00},   // Busy, fake parity for now
                {0x20,          HARDWARE_ERROR,  0x00, 0x00},   // Device fault
@@ -1532,7 +1532,7 @@ unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
        return 0;
 }
 
-static const char *inq_83_str = "Linux ATA-SCSI simulator";
+static const char * const inq_83_str = "Linux ATA-SCSI simulator";
 
 /**
  *     ata_scsiop_inq_83 - Simulate INQUIRY EVPD page 83, device identity

diff --git a/drivers/scsi/sata_mv.c b/drivers/scsi/sata_mv.c
index ab7432a..c941766 100644 (file)
--- a/drivers/scsi/sata_mv.c
+++ b/drivers/scsi/sata_mv.c
@@ -430,7 +430,7 @@ static const struct ata_port_operations mv6_ops = {
        .host_stop              = mv_host_stop,
 };
 
-static struct ata_port_info mv_port_info[] = {
+static const struct ata_port_info mv_port_info[] = {
        {  /* chip_504x */
                .sht            = &mv_sht,
                .host_flags     = MV_COMMON_FLAGS,

diff --git a/drivers/scsi/sata_promise.c b/drivers/scsi/sata_promise.c
index 25e56fb..0208906 100644 (file)
--- a/drivers/scsi/sata_promise.c
+++ b/drivers/scsi/sata_promise.c
@@ -158,7 +158,7 @@ static const struct ata_port_operations pdc_pata_ops = {
        .host_stop              = ata_pci_host_stop,
 };
 
-static struct ata_port_info pdc_port_info[] = {
+static const struct ata_port_info pdc_port_info[] = {
        /* board_2037x */
        {
                .sht            = &pdc_ata_sht,

diff --git a/drivers/scsi/sata_qstor.c b/drivers/scsi/sata_qstor.c
index a8987f5..6b9c3ae 100644 (file)
--- a/drivers/scsi/sata_qstor.c
+++ b/drivers/scsi/sata_qstor.c
@@ -170,7 +170,7 @@ static const struct ata_port_operations qs_ata_ops = {
        .bmdma_status           = qs_bmdma_status,
 };
 
-static struct ata_port_info qs_port_info[] = {
+static const struct ata_port_info qs_port_info[] = {
        /* board_2068_idx */
        {
                .sht            = &qs_ata_sht,

diff --git a/drivers/scsi/sata_sil.c b/drivers/scsi/sata_sil.c
index 3609186..d205348 100644 (file)
--- a/drivers/scsi/sata_sil.c
+++ b/drivers/scsi/sata_sil.c
@@ -176,7 +176,7 @@ static const struct ata_port_operations sil_ops = {
        .host_stop              = ata_pci_host_stop,
 };
 
-static struct ata_port_info sil_port_info[] = {
+static const struct ata_port_info sil_port_info[] = {
        /* sil_3112 */
        {
                .sht            = &sil_sht,

diff --git a/drivers/scsi/sata_sx4.c b/drivers/scsi/sata_sx4.c
index dcc3ad9..7c4b535 100644 (file)
--- a/drivers/scsi/sata_sx4.c
+++ b/drivers/scsi/sata_sx4.c
@@ -215,7 +215,7 @@ static const struct ata_port_operations pdc_20621_ops = {
        .host_stop              = pdc20621_host_stop,
 };
 
-static struct ata_port_info pdc_port_info[] = {
+static const struct ata_port_info pdc_port_info[] = {
        /* board_20621 */
        {
                .sht            = &pdc_sata_sht,