where is "equalize" kernel patch?

[Jihoon Chung <jhchung@xxxxxxxxxxxxx>]

I found following paragraph in the man page of iproute2.

equalize

    allow packet by packet randomization on multipath routes.
    Without this modifier, the route will be frozen to one selected
    nexthop, so that load splitting will only occur on per-flow base.
    equalize only works if the kernel is patched.                    
                               ^^^^^^^^^^^^^^^^^

Now, where can I find
this patch ?
(I'm using kernel 2.4.21)

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