image editing - Is it possible to apply Photoshop adjustment layers to multiple raster layers?

I have something like this:

Raster Layer 1
Raster Layer 2
Adjustment Layer
Raster Layer 3
Raster Layer 4

I want to apply the adjustment layer to the raster layers below it, "rasterizing" it basically, so that the pixels in layers 3 & 4 are changed based on the adjustment layer. I don't want to modify the layer stack in any way. That is, no creating or removing layers. Layer 3 and 4 must stay exactly as they are, just the pixels in them should be changed. I don't want to do this one layer at a time, is this possible in Photoshop CS4?