New demand page function

["User &" <breno_silva@beta.bandnet.com.br>]

Hi , i done one function for demand page.
This do almost the same thing of the others functions , the diffence is in 
when do the page allocations.
This still need some tests , but i´d like to know your opinions.

struct page *f_a_page(unsigned int gfp_mask,zone_t *zone,pte_t pte)
{
 struct page *page;
 struct page *new;
 char *kaddr;
 int i,j;
 
 /* Teste if there are many pages to alloc and try to alloc just one page*/

reload: if((zone->free_pages >= zone->pages_min)) {
 	page = alloc_page(gfp_mask,0);
 		if(!page)
 			return NOPAGE_OOM;
 /*Map alloced page*/
	
	kaddr = (char *)kmap(page);
		if(!kaddr)
			return;

	return page;
	}
 /*If there aren´t no much pages , try to free some pages*/

     else {
	i = 0;
        do {
        	i++;
	 	j = 2*2*i;
		}while((j > zone->pages_min));
 
		new = pte_page(pte);
		if(new) {
			if(new->count !=0)
				spin_lock(&zone->lock);
				 __free_pages(new,i);
				spin_unlock(&zone->lock);
				goto reload;
			}
}
	   
thanks
Breno
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