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Message-ID: <Pine.LNX.4.64.0808021712240.20095@ask.diku.dk>
Date: Sat, 2 Aug 2008 17:12:46 +0200 (CEST)
From: Julia Lawall <julia@...u.dk>
To: axboe@...nel.dk, linux-kernel@...r.kernel.org,
kernel-janitors@...r.kernel.org
Subject: [PATCH 2/10] drivers/block: Use DIV_ROUND_UP
From: Julia Lawall <julia@...u.dk>
The kernel.h macro DIV_ROUND_UP performs the computation (((n) + (d) - 1) /
(d)) but is perhaps more readable.
An extract of the semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)
// <smpl>
@haskernel@
@@
#include <linux/kernel.h>
@depends on haskernel@
expression n,d;
@@
(
- (n + d - 1) / d
+ DIV_ROUND_UP(n,d)
|
- (n + (d - 1)) / d
+ DIV_ROUND_UP(n,d)
)
@depends on haskernel@
expression n,d;
@@
- DIV_ROUND_UP((n),d)
+ DIV_ROUND_UP(n,d)
@depends on haskernel@
expression n,d;
@@
- DIV_ROUND_UP(n,(d))
+ DIV_ROUND_UP(n,d)
// </smpl>
Signed-off-by: Julia Lawall <julia@...u.dk>
---
drivers/block/cciss.c | 8 ++++----
drivers/block/cpqarray.c | 2 +-
drivers/block/floppy.c | 8 ++++----
3 files changed, 9 insertions(+), 9 deletions(-)
diff -u -p a/drivers/block/cciss.c b/drivers/block/cciss.c
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3438,8 +3438,8 @@ static int __devinit cciss_init_one(stru
hba[i]->intr[SIMPLE_MODE_INT], dac ? "" : " not");
hba[i]->cmd_pool_bits =
- kmalloc(((hba[i]->nr_cmds + BITS_PER_LONG -
- 1) / BITS_PER_LONG) * sizeof(unsigned long), GFP_KERNEL);
+ kmalloc(DIV_ROUND_UP(hba[i]->nr_cmds, BITS_PER_LONG)
+ * sizeof(unsigned long), GFP_KERNEL);
hba[i]->cmd_pool = (CommandList_struct *)
pci_alloc_consistent(hba[i]->pdev,
hba[i]->nr_cmds * sizeof(CommandList_struct),
@@ -3471,8 +3471,8 @@ static int __devinit cciss_init_one(stru
/* command and error info recs zeroed out before
they are used */
memset(hba[i]->cmd_pool_bits, 0,
- ((hba[i]->nr_cmds + BITS_PER_LONG -
- 1) / BITS_PER_LONG) * sizeof(unsigned long));
+ DIV_ROUND_UP(hba[i]->nr_cmds, BITS_PER_LONG)
+ * sizeof(unsigned long));
#ifdef CCISS_DEBUG
printk(KERN_DEBUG "Scanning for drives on controller cciss%d\n", i);
diff -u -p a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -424,7 +424,7 @@ static int __init cpqarray_register_ctlr
hba[i]->pci_dev, NR_CMDS * sizeof(cmdlist_t),
&(hba[i]->cmd_pool_dhandle));
hba[i]->cmd_pool_bits = kcalloc(
- (NR_CMDS+BITS_PER_LONG-1)/BITS_PER_LONG, sizeof(unsigned long),
+ DIV_ROUND_UP(NR_CMDS, BITS_PER_LONG), sizeof(unsigned long),
GFP_KERNEL);
if (!hba[i]->cmd_pool_bits || !hba[i]->cmd_pool)
diff -u -p a/drivers/block/floppy.c b/drivers/block/floppy.c
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -1355,20 +1355,20 @@ static void fdc_specify(void)
}
/* Convert step rate from microseconds to milliseconds and 4 bits */
- srt = 16 - (DP->srt * scale_dtr / 1000 + NOMINAL_DTR - 1) / NOMINAL_DTR;
+ srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
if (slow_floppy) {
srt = srt / 4;
}
SUPBOUND(srt, 0xf);
INFBOUND(srt, 0);
- hlt = (DP->hlt * scale_dtr / 2 + NOMINAL_DTR - 1) / NOMINAL_DTR;
+ hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
if (hlt < 0x01)
hlt = 0x01;
else if (hlt > 0x7f)
hlt = hlt_max_code;
- hut = (DP->hut * scale_dtr / 16 + NOMINAL_DTR - 1) / NOMINAL_DTR;
+ hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
if (hut < 0x1)
hut = 0x1;
else if (hut > 0xf)
@@ -2385,7 +2385,7 @@ static void rw_interrupt(void)
#ifdef FLOPPY_SANITY_CHECK
if (nr_sectors / ssize >
- (in_sector_offset + current_count_sectors + ssize - 1) / ssize) {
+ DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
DPRINT("long rw: %x instead of %lx\n",
nr_sectors, current_count_sectors);
printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
--
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