linux-kernel - [PATCH 6/6] staging: comedi: Using macro DIV_ROUND

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Date:   Tue, 21 Feb 2017 23:58:26 +0530
From:   simran singhal <singhalsimran0@...il.com>
To:     abbotti@....co.uk
Cc:     hsweeten@...ionengravers.com, gregkh@...uxfoundation.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com
Subject: [PATCH 6/6] staging: comedi: Using macro DIV_ROUND_UP

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@...il.com>
---
 drivers/staging/comedi/drivers/addi_apci_3xxx.c | 2 +-
 drivers/staging/comedi/drivers/cb_pcidas64.c    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/comedi/drivers/addi_apci_3xxx.c b/drivers/staging/comedi/drivers/addi_apci_3xxx.c
index b6af3eb..82c2211 100644
--- a/drivers/staging/comedi/drivers/addi_apci_3xxx.c
+++ b/drivers/staging/comedi/drivers/addi_apci_3xxx.c
@@ -502,7 +502,7 @@ static int apci3xxx_ai_ns_to_timer(struct comedi_device *dev,
 			timer = *ns / base;
 			break;
 		case CMDF_ROUND_UP:
-			timer = (*ns + base - 1) / base;
+			timer = DIV_ROUND_UP(*ns, base);
 			break;
 		}
 
diff --git a/drivers/staging/comedi/drivers/cb_pcidas64.c b/drivers/staging/comedi/drivers/cb_pcidas64.c
index efbf277..3b98193 100644
--- a/drivers/staging/comedi/drivers/cb_pcidas64.c
+++ b/drivers/staging/comedi/drivers/cb_pcidas64.c
@@ -2007,7 +2007,7 @@ static unsigned int get_divisor(unsigned int ns, unsigned int flags)
 
 	switch (flags & CMDF_ROUND_MASK) {
 	case CMDF_ROUND_UP:
-		divisor = (ns + TIMER_BASE - 1) / TIMER_BASE;
+		divisor = DIV_ROUND_UP(ns, TIMER_BASE);
 		break;
 	case CMDF_ROUND_DOWN:
 		divisor = ns / TIMER_BASE;
-- 
2.7.4