c
1 void page_cache_ra_order(struct readahead_control *ractl,
2         struct file_ra_state *ra, unsigned int new_order)
3 {
4     // ... existing code ...
5 
6     // Validate ra pointer before use
7     if (!ra) {
8         // Handle the error, e.g., return, set an error code, etc.
9         return;
10     }
11 
12     pgoff_t mark = index + ra->size - ra->async_size;
13     // ... rest of the function ...
