[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/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 3b4ca55..b21b885 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -418,7 +418,7 @@
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 @@
{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 @@
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