int i, ret;
unsigned long pages_per_block = PAGES_PER_SECTION * sections_per_block;
- phys_addr = simple_strtoull(buf, NULL, 0);
+ ret = kstrtoull(buf, 0, &phys_addr);
+ if (ret)
+ return ret;
if (phys_addr & ((pages_per_block << PAGE_SHIFT) - 1))
return -EINVAL;