Are we talking about the datapath or userspace? The datapath would
use the Linux kernel roundup(), from linux/kernel.h. Userspace would
use ROUND_UP(), from lib/util.h.
On Fri, Jun 07, 2013 at 08:28:20PM +0000, Rajahalme, Jarno (NSN - FI/Espoo)
wrote:
> It is in lib/util.h:
>
> lib/util.h:#define DIV_ROUND_UP(X, Y) (((X) + ((Y) - 1)) / (Y))
> lib/util.h:#define ROUND_UP(X, Y) (DIV_ROUND_UP(X, Y) * (Y))
>
> Jarno
>
> On Jun 7, 2013, at 17:39 , ext Andy Zhou wrote:
>
> Thanks for the suggestion.
>
> The kernel source I am looking at: 3.9.0-rc8, does not a accessible
> definition of ROUND_UP, but roundup(x,y) is, and fits the bill. I am
> thinking of using it instead, unless it breaks on some older kernel version
> that we care about.
>
> From kernel.h:
>
> /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
> #define roundup(x, y) ( \
> { \
> const typeof(y) __y = y; \
> (((x) + (__y - 1)) / __y) * __y; \
> }
>
>
> On Fri, Jun 7, 2013 at 7:19 AM, Rajahalme, Jarno (NSN - FI/Espoo)
> <jarno.rajaha...@nsn.com<mailto:jarno.rajaha...@nsn.com>> wrote:
>
> On Jun 7, 2013, at 13:35 , ext Andy Zhou wrote:
>
> Is this the same as DIV_ROUND_UP?
> I did not use it because DIV_ROUND_UP gives the roundup of u32, I needed the
> roundup in bytes. However, I could rewrite this function using DIV_ROUND_UP.
>
> There is ROUND_UP doing that already.
>
>
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