scsi: remove gfp_flags member in scsi_host_cmd_pool

When using the slab allocator we already decide at cache creation time if
an allocation comes from a GFP_DMA pool using the SLAB_CACHE_DMA flag,
and there is no point passing the kmalloc-family only GFP_DMA flag to
kmem_cache_alloc.  Drop all the infrastructure for doing so.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

drivers/scsi/scsi.c

@@ -105,7 +105,6 @@ struct scsi_host_cmd_pool {
 	char			*cmd_name;
 	char			*sense_name;
 	unsigned int		slab_flags;
-	gfp_t			gfp_mask;
 };
 
 static struct scsi_host_cmd_pool scsi_cmd_pool = {
@@ -118,7 +117,6 @@ static struct scsi_host_cmd_pool scsi_cmd_dma_pool = {
 	.cmd_name	= "scsi_cmd_cache(DMA)",
 	.sense_name	= "scsi_sense_cache(DMA)",
 	.slab_flags	= SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA,
-	.gfp_mask	= __GFP_DMA,
 };
 
 static DEFINE_MUTEX(host_cmd_pool_mutex);
@@ -156,12 +154,11 @@ scsi_host_alloc_command(struct Scsi_Host *shost, gfp_t gfp_mask)
 	struct scsi_host_cmd_pool *pool = shost->cmd_pool;
 	struct scsi_cmnd *cmd;
 
-	cmd = kmem_cache_zalloc(pool->cmd_slab, gfp_mask | pool->gfp_mask);
+	cmd = kmem_cache_zalloc(pool->cmd_slab, gfp_mask);
 	if (!cmd)
 		goto fail;
 
-	cmd->sense_buffer = kmem_cache_alloc(pool->sense_slab,
+	cmd->sense_buffer = kmem_cache_alloc(pool->sense_slab, gfp_mask);
-					     gfp_mask | pool->gfp_mask);
 	if (!cmd->sense_buffer)
 		goto fail_free_cmd;
 
@@ -327,10 +324,8 @@ scsi_alloc_host_cmd_pool(struct Scsi_Host *shost)
 	}
 
 	pool->slab_flags = SLAB_HWCACHE_ALIGN;
-	if (shost->unchecked_isa_dma) {
+	if (shost->unchecked_isa_dma)
 		pool->slab_flags |= SLAB_CACHE_DMA;
-		pool->gfp_mask = __GFP_DMA;
-	}
 
 	if (hostt->cmd_size)
 		hostt->cmd_pool = pool;
@@ -424,7 +419,6 @@ static void scsi_put_host_cmd_pool(struct Scsi_Host *shost)
  */
 int scsi_setup_command_freelist(struct Scsi_Host *shost)
 {
-	const gfp_t gfp_mask = shost->unchecked_isa_dma ? GFP_DMA : GFP_KERNEL;
 	struct scsi_cmnd *cmd;
 
 	spin_lock_init(&shost->free_list_lock);
@@ -437,7 +431,7 @@ int scsi_setup_command_freelist(struct Scsi_Host *shost)
 	/*
 	 * Get one backup command for this host.
 	 */
-	cmd = scsi_host_alloc_command(shost, gfp_mask);
+	cmd = scsi_host_alloc_command(shost, GFP_KERNEL);
 	if (!cmd) {
 		scsi_put_host_cmd_pool(shost);
 		shost->cmd_pool = NULL;