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SubjectRe: [PATCH 6/6] staging: comedi: Using macro DIV_ROUND_UP
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On 21/02/17 18:28, simran singhal wrote:
> 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/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;
>

Thanks. Ideally, this should be split into two patches, one for each
driver module, but I guess we can live with a single patch. (I don't
know about the other 5 patches in this series.)

Reviewed-by: Ian Abbott <abbotti@mev.co.uk>

--
-=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@mev.co.uk> )=-
-=( Web: http://www.mev.co.uk/ )=-

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