Re: [B.A.T.M.A.N.] [PATCH] batman-adv: Fixing wrap-around bug in vis

On Fri, Mar 12, 2010 at 01:09:31AM +0100, Linus L??ssing wrote:

Sorry still does not seem to work :). Despite testing it on a setup in batman itself I also tested it with a small c program (which does not work as expected either):

---

#include <stdio.h> #include <stdint.h>

#define seq_before(x,y) ((x - y) > 1 << 7 + 8 * (sizeof(x) - 1)) #define seq_after(x,y) ((y - x) >= 1 << 7 + 8 * (sizeof(x) - 1))

int main() { uint8_t old = 0; uint8_t new = 1; if (!seq_after(new,old)) printf("foobar\n");

    return 0;

}

It is worth taking a look at include/linux/jiffies.h. The macros time_after(), time_after_eq() etc.

Andrew