[PATCH] hpsa: cleanup bitops usage

[PATCH] hpsa: cleanup bitops usage

[Akinobu Mita]

- Remove unnecessary correction of bit and address
- Use BITS_TO_LONGS macro to calculate bitmap size

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Cc: iss_storagedev@hp.com
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: linux-scsi@vger.kernel.org
---
 drivers/scsi/hpsa.c |   10 +++-------
 1 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 500e20d..ddbf5fe 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -2351,9 +2351,7 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h)
 		i = find_first_zero_bit(h->cmd_pool_bits, h->nr_cmds);
 		if (i == h->nr_cmds)
 			return NULL;
-	} while (test_and_set_bit
-		 (i & (BITS_PER_LONG - 1),
-		  h->cmd_pool_bits + (i / BITS_PER_LONG)) != 0);
+	} while (test_and_set_bit(i, h->cmd_pool_bits) != 0);
 	c = h->cmd_pool + i;
 	memset(c, 0, sizeof(*c));
 	cmd_dma_handle = h->cmd_pool_dhandle
@@ -2420,8 +2418,7 @@ static void cmd_free(struct ctlr_info *h, struct CommandList *c)
 	int i;
 
 	i = c - h->cmd_pool;
-	clear_bit(i & (BITS_PER_LONG - 1),
-		  h->cmd_pool_bits + (i / BITS_PER_LONG));
+	clear_bit(i, h->cmd_pool_bits);
 	h->nr_frees++;
 }
 
@@ -4045,8 +4042,7 @@ static __devinit int hpsa_init_reset_devices(struct pci_dev *pdev)
 
 static __devinit int hpsa_allocate_cmd_pool(struct ctlr_info *h)
 {
-	h->cmd_pool_bits = kzalloc(
-		DIV_ROUND_UP(h->nr_cmds, BITS_PER_LONG) *
+	h->cmd_pool_bits = kzalloc(BITS_TO_LONGS(h->nr_cmds) *
 		sizeof(unsigned long), GFP_KERNEL);
 	h->cmd_pool = pci_alloc_consistent(h->pdev,
 		    h->nr_cmds * sizeof(*h->cmd_pool),
-- 
1.7.4.4

[PATCH] hpsa: cleanup bitops usage

[Akinobu Mita]

Remove unnecessary adjustment for bit number and address of bitmask,
and use BITS_TO_LONGS macro to calculate bitmap size.  This change
just simplifies the code a bit.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Don Brace <don.brace@pmcs.com>
Cc: iss_storagedev@hp.com
Cc: storagedev@pmcs.com
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: linux-scsi@vger.kernel.org
---
 drivers/scsi/hpsa.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index a1cfbd3..73a282b 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -4697,8 +4697,7 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h)
 			offset = (i + 1) % h->nr_cmds;
 			continue;
 		}
-		set_bit(i & (BITS_PER_LONG - 1),
-			h->cmd_pool_bits + (i / BITS_PER_LONG));
+		set_bit(i, h->cmd_pool_bits);
 		break; /* it's ours now. */
 	}
 	h->last_allocation = i; /* benignly racy */
@@ -4729,8 +4728,7 @@ static void cmd_free(struct ctlr_info *h, struct CommandList *c)
 		int i;
 
 		i = c - h->cmd_pool;
-		clear_bit(i & (BITS_PER_LONG - 1),
-			  h->cmd_pool_bits + (i / BITS_PER_LONG));
+		clear_bit(i, h->cmd_pool_bits);
 	}
 }
 
@@ -6410,8 +6408,7 @@ out_disable:
 
 static int hpsa_allocate_cmd_pool(struct ctlr_info *h)
 {
-	h->cmd_pool_bits = kzalloc(
-		DIV_ROUND_UP(h->nr_cmds, BITS_PER_LONG) *
+	h->cmd_pool_bits = kcalloc(BITS_TO_LONGS(h->nr_cmds),
 		sizeof(unsigned long), GFP_KERNEL);
 	h->cmd_pool = pci_alloc_consistent(h->pdev,
 		    h->nr_cmds * sizeof(*h->cmd_pool),
-- 
1.9.1