[TEST] packet: change call of synchronize_net to call_rcu

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <net/ethernet.h>
#include <errno.h>
#include <time.h>

#define SOCK_LIMIT1 5000
#define SOCK_LIMIT2 10000
/* Total number of sockets is (SOCK_LIMIT1 * SOCK_LIMIT2) */

int main (int argc, char **argv)
{
    int i, j, sd;
    double secs = 0.0;

    for(i = 0; i < SOCK_LIMIT1; ++i)
        for(j = 0; j < SOCK_LIMIT2; ++j) {
            /* Submit request for a raw socket descriptor */
            if ((sd = socket (PF_PACKET, SOCK_RAW, htons (ETH_P_ALL))) < 0) {
                perror ("socket() failed ");
                exit (EXIT_FAILURE);
            }

            clock_t start = clock();
            /* Close socket descriptor */
            close (sd);
            secs += (double)(clock() - start) / (double) CLOCKS_PER_SEC;
        }

    printf("Sock closing time (secs): %.2f\n", secs);
    return (EXIT_SUCCESS);
}