}
if ((pgt_buf_end + num) > pgt_buf_top || !can_use_brk_pgt) {
- unsigned long ret;
- if (min_pfn_mapped >= max_pfn_mapped)
- panic("alloc_low_pages: ran out of memory");
- ret = memblock_find_in_range(min_pfn_mapped << PAGE_SHIFT,
+ unsigned long ret = 0;
+
+ if (min_pfn_mapped < max_pfn_mapped) {
+ ret = memblock_find_in_range(
+ min_pfn_mapped << PAGE_SHIFT,
max_pfn_mapped << PAGE_SHIFT,
PAGE_SIZE * num , PAGE_SIZE);
+ }
+ if (ret)
+ memblock_reserve(ret, PAGE_SIZE * num);
+ else if (can_use_brk_pgt)
+ ret = __pa(extend_brk(PAGE_SIZE * num, PAGE_SIZE));
+
if (!ret)
panic("alloc_low_pages: can not alloc memory");
- memblock_reserve(ret, PAGE_SIZE * num);
+
pfn = ret >> PAGE_SHIFT;
} else {
pfn = pgt_buf_end;