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scsi: flip the default on use_clustering

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Most SCSI drivers want to enable "clustering", that is merging of
segments so that they might span more than a single page.  Remove the
ENABLE_CLUSTERING define, and require drivers to explicitly set
DISABLE_CLUSTERING to disable this feature.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig
2018-12-13 16:17:02 +01:00
committed by Martin K. Petersen
parent 4dd4130a72
commit 2a3d4eb8e2
82 changed files with 4 additions and 110 deletions
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8
drivers/scsi/advansys.c
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@@ -10808,14 +10808,6 @@ static struct scsi_host_template advansys_template = {
* for non-ISA adapters.
*/
.unchecked_isa_dma = true,
/*
* All adapters controlled by this driver are capable of large
* scatter-gather lists. According to the mid-level SCSI documentation
* this obviates any performance gain provided by setting
* 'use_clustering'. But empirically while CPU utilization is increased
* by enabling clustering, I/O throughput increases as well.
*/
.use_clustering = ENABLE_CLUSTERING,
};
static int advansys_wide_init_chip(struct Scsi_Host *shost)