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scsi: ncr5380: Improve hostdata struct member alignment and cache-ability 

Re-order struct members so that hot data lies at the beginning of the
struct and cold data at the end. Improve the comments while we're here.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain 2016-10-10 00:46:53 -04:00 committed by Martin K. Petersen
parent 4822827a69
commit 25894d1f98
1 changed files with 20 additions and 20 deletions
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40
drivers/scsi/NCR5380.h
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@ -219,27 +219,27 @@
#define FLAG_TOSHIBA_DELAY 128 /* Allow for borken CD-ROMs */
struct NCR5380_hostdata {
NCR5380_implementation_fields; /* implementation specific */
struct Scsi_Host *host; /* Host backpointer */
unsigned char id_mask, id_higher_mask; /* 1 << id, all bits greater */
unsigned char busy[8]; /* index = target, bit = lun */
int dma_len; /* requested length of DMA */
unsigned char last_message; /* last message OUT */
struct scsi_cmnd *connected; /* currently connected cmnd */
struct scsi_cmnd *selecting; /* cmnd to be connected */
struct list_head unissued; /* waiting to be issued */
struct list_head autosense; /* priority issue queue */
struct list_head disconnected; /* waiting for reconnect */
spinlock_t lock; /* protects this struct */
int flags;
struct scsi_eh_save ses;
struct scsi_cmnd *sensing;
NCR5380_implementation_fields; /* Board-specific data */
unsigned long poll_loops; /* Register polling limit */
spinlock_t lock; /* Protects this struct */
struct scsi_cmnd *connected; /* Currently connected cmnd */
struct list_head disconnected; /* Waiting for reconnect */
struct Scsi_Host *host; /* SCSI host backpointer */
struct workqueue_struct *work_q; /* SCSI host work queue */
struct work_struct main_task; /* Work item for main loop */
int flags; /* Board-specific quirks */
int dma_len; /* Requested length of DMA */
int read_overruns; /* Transfer size reduction for DMA erratum */
struct list_head unissued; /* Waiting to be issued */
struct scsi_cmnd *selecting; /* Cmnd to be connected */
struct list_head autosense; /* Priority cmnd queue */
struct scsi_cmnd *sensing; /* Cmnd needing autosense */
struct scsi_eh_save ses; /* Cmnd state saved for EH */
unsigned char busy[8]; /* Index = target, bit = lun */
unsigned char id_mask; /* 1 << Host ID */
unsigned char id_higher_mask; /* All bits above id_mask */
unsigned char last_message; /* Last Message Out */
char info[256];
int read_overruns; /* number of bytes to cut from a
* transfer to handle chip overruns */
struct work_struct main_task;
struct workqueue_struct *work_q;
unsigned long poll_loops; /* register polling limit */
};
#ifdef __KERNEL__