binding a key to a function with an argument

[John Withers]

Folks,

I am trying to change C-x C-s save-buffer to save-some-buffers with the
non-nil argument so that it will save all without questions. 

I have no problem with the bind of the save-some-buffers:

(global-set-key (kbd "C-x C-s") 'save--some-buffers)

but I can't figure out how to pass the non-nil argument. I have tried a
few different ways and they all throw errors.

Any help would be appreciated.

-john