In the 64-bit kernel, the semaphore structure (like the 32-bit kernel)
has waking and count fields swizzled so they line up the same in a
64-bit double word for either endian.  However, the semaphore-helper.h
function waking_non_zero_interruptible still has specialized code for
little-endian manipulation of the fields as though they are swapped.

Patch is attached, and fixes a pipe deadlock I was seeing (both the
reader and writer were down'ing the semaphore).

patch is against 2.5, but should be clean against 2.4 also.

Kip