@@ -42,6 +42,7 @@
#define STACK_SIZE_PAGE_ORDER __STACK_SIZE_PAGE_ORDER
#define STACK_SIZE __STACK_SIZE
+extern unsigned long nr_free_pages;
void init_mm(void);
unsigned long alloc_pages(int order);
@@ -53,6 +53,8 @@ static unsigned long *alloc_bitmap;
#define allocated_in_map(_pn) \
(alloc_bitmap[(_pn)/PAGES_PER_MAPWORD] & (1UL<<((_pn)&(PAGES_PER_MAPWORD-1))))
+unsigned long nr_free_pages;
+
/*
* Hint regarding bitwise arithmetic in map_{alloc,free}:
* -(1<<n) sets all bits >= n.
@@ -81,6 +83,8 @@ static void map_alloc(unsigned long first_page, unsigned long nr_pages)
while ( ++curr_idx < end_idx ) alloc_bitmap[curr_idx] = ~0UL;
alloc_bitmap[curr_idx] |= (1UL<<end_off)-1;
}
+
+ nr_free_pages -= nr_pages;
}
@@ -93,6 +97,8 @@ static void map_free(unsigned long first_page, unsigned long nr_pages)
end_idx = (first_page + nr_pages) / PAGES_PER_MAPWORD;
end_off = (first_page + nr_pages) & (PAGES_PER_MAPWORD-1);
+ nr_free_pages += nr_pages;
+
if ( curr_idx == end_idx )
{
alloc_bitmap[curr_idx] &= -(1UL<<end_off) | ((1UL<<start_off)-1);