list_for_each_entry_safe_reverse

list_for_each_entry_safe_reverse is a macro in the Linux kernel that is used to iterate over a doubly linked list in reverse order, while safely removing or modifying the entries in the list.

The macro takes four arguments:

1. pointer to the current entry in the list
2. pointer to the temporary variable used to store the next entry
3. pointer to the head of the list
4. name of the member in the struct that represents the list

Here is the syntax for the macro:

list_for_each_entry_safe_reverse(pos, n, head, member) {
    // do something with pos
}

The macro works by iterating over the list in reverse order, starting from the last entry and moving towards the head of the list. It uses a temporary variable (n) to store the next entry before modifying or removing the current entry (pos). This ensures that the list remains intact while the iteration is in progress.

Overall, list_for_each_entry_safe_reverse is a useful macro for safely iterating over and modifying doubly linked lists in the Linux kernel.