linux-kernel - [PATCH] cpqarray: simplify bitops usages

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Date:	Sat, 14 Mar 2015 10:12:54 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Akinobu Mita <akinobu.mita@...il.com>,
	Don Brace <don.brace@...s.com>, iss_storagedev@...com
Subject: [PATCH] cpqarray: simplify bitops usages

Remove unnecessary adjustment for bit number and address of bitmask.
This change just simplifies the code a bit.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: Don Brace <don.brace@...s.com>
Cc: iss_storagedev@...com
---
 drivers/block/cpqarray.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index 2b94403..34dde22 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -422,8 +422,8 @@ static int cpqarray_register_ctlr(int i, struct pci_dev *pdev)
 	hba[i]->cmd_pool = pci_alloc_consistent(
 		hba[i]->pci_dev, NR_CMDS * sizeof(cmdlist_t),
 		&(hba[i]->cmd_pool_dhandle));
-	hba[i]->cmd_pool_bits = kcalloc(
-		DIV_ROUND_UP(NR_CMDS, BITS_PER_LONG), sizeof(unsigned long),
+	hba[i]->cmd_pool_bits = kcalloc(BITS_TO_LONGS(NR_CMDS),
+		sizeof(unsigned long),
 		GFP_KERNEL);
 
 	if (!hba[i]->cmd_pool_bits || !hba[i]->cmd_pool)
@@ -1373,7 +1373,7 @@ static cmdlist_t * cmd_alloc(ctlr_info_t *h, int get_from_pool)
 			i = find_first_zero_bit(h->cmd_pool_bits, NR_CMDS);
 			if (i == 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;
 		cmd_dhandle = h->cmd_pool_dhandle + i*sizeof(cmdlist_t);
 		h->nr_allocs++;
@@ -1393,7 +1393,7 @@ static void cmd_free(ctlr_info_t *h, cmdlist_t *c, int got_from_pool)
 			c->busaddr);
 	} else {
 		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++;
 	}
 }
-- 
1.9.1

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