qemu/memory.c:206:  pointless copies of large structs ?

[qemu/memory.c:206]: (performance) Function parameter 'a' should be passed by reference.
[qemu/memory.c:207]: (performance) Function parameter 'b' should be passed by reference.

Source code is

static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
                                          MemoryRegionIoeventfd b)