From: simran singhal <singhalsimran0@gmail.com>
To: gregkh@linuxfoundation.org
Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
outreachy-kernel@googlegroups.com
Subject: [PATCH 2/7] staging: most: Using macro DIV_ROUND_UP
Date: Wed, 22 Feb 2017 00:26:15 +0530 [thread overview]
Message-ID: <20170221185615.GA25627@singhal-Inspiron-5558> (raw)
The macro DIV_ROUND_UP performs the computation (((n) + (d) - 1) /(d)).
It clarifies the divisor calculations. This occurence was detected using
the coccinelle script:
@@
expression e1;
expression e2;
@@
(
- ((e1) + e2 - 1) / (e2)
+ DIV_ROUND_UP(e1,e2)
|
- ((e1) + (e2 - 1)) / (e2)
+ DIV_ROUND_UP(e1,e2)
)
Signed-off-by: simran singhal <singhalsimran0@gmail.com>
---
drivers/staging/most/hdm-dim2/dim2_hal.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/most/hdm-dim2/dim2_hal.c b/drivers/staging/most/hdm-dim2/dim2_hal.c
index 0b9816c..6824826 100644
--- a/drivers/staging/most/hdm-dim2/dim2_hal.c
+++ b/drivers/staging/most/hdm-dim2/dim2_hal.c
@@ -49,7 +49,7 @@
#define DBR_SIZE (16 * 1024) /* specified by IP */
#define DBR_BLOCK_SIZE (DBR_SIZE / 32 / DBR_MAP_SIZE)
-#define ROUND_UP_TO(x, d) (((x) + (d) - 1) / (d) * (d))
+#define ROUND_UP_TO(x, d) (DIV_ROUND_UP(x, (d)) * (d))
/* -------------------------------------------------------------------------- */
/* generic helper functions and macros */
@@ -117,7 +117,7 @@ static int alloc_dbr(u16 size)
return DBR_SIZE; /* out of memory */
for (i = 0; i < DBR_MAP_SIZE; i++) {
- u32 const blocks = (size + DBR_BLOCK_SIZE - 1) / DBR_BLOCK_SIZE;
+ u32 const blocks = DIV_ROUND_UP(size, DBR_BLOCK_SIZE);
u32 mask = ~((~(u32)0) << blocks);
do {
@@ -137,7 +137,7 @@ static int alloc_dbr(u16 size)
static void free_dbr(int offs, int size)
{
int block_idx = offs / DBR_BLOCK_SIZE;
- u32 const blocks = (size + DBR_BLOCK_SIZE - 1) / DBR_BLOCK_SIZE;
+ u32 const blocks = DIV_ROUND_UP(size, DBR_BLOCK_SIZE);
u32 mask = ~((~(u32)0) << blocks);
mask <<= block_idx % 32;
--
2.7.4
next reply other threads:[~2017-02-21 18:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-21 18:56 simran singhal [this message]
2017-02-21 19:58 ` [Outreachy kernel] [PATCH 2/7] staging: most: Using macro DIV_ROUND_UP Julia Lawall
[not found] ` <e9a638db-16fe-4e85-a132-c45c39307df1@googlegroups.com>
2017-02-22 7:23 ` Julia Lawall
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