(gdb) list
1917    void breakpoint(void)
1918    {
1919            atomic_set(&kgdb_setting_breakpoint, 1);
1920            wmb(); /* Sync point before breakpoint */
1921            BREAKPOINT();
1922            wmb(); /* Sync point after breakpoint */
1923            atomic_set(&kgdb_setting_breakpoint, 0);
1924    }
1925    EXPORT_SYMBOL(breakpoint);
1926