Description of problem:
In this particular case users of ppc64 are unable to set things like memlock
higher than 4G

Version-Release number of selected component (if applicable):
2.6.9

How reproducible:
Everytime

Steps to Reproduce:
Set memlock higher than 4G in /etc/security/limits.conf

This simple application shows its effect :
#include <sys/resource.h>
#include <stdio.h>
#include <stdlib.h>

int main ()
{
  struct rlimit rlim;
  
  rlim.rlim_max = 5961560;
  rlim.rlim_cur = rlim.rlim_max;

  if ( setrlimit(8, &rlim) < 0) {
    fprintf(stderr,"Failed to set memlock max\n");
    exit(1);
  }
  fprintf(stderr,"rlim_cur: %ld\n",rlim.rlim_cur);
  return 1;
}
  
Actual results:
Fails to set memlock higher than 4G.

Expected results:
Allow for higher threshold

Additional info: