This patch fixes ineffiecency in copying user data in some code pieces
when 4GB split is ON:
filemap.c tries to call __copy_XXX_user while in atomic, but 4GB split
code always fails copying when in atomic. So this optimization for
normal kernels doesn't work with 4GB split, moreover, makes lot's of 
unnessaccary locks/checks.

Signed-Off-By: Kirill Korotaev <dev@sw.ru>

Kirill

P.S. These 4GB split patches are against modified 2.6.8.1 kernel, but 
should be appliable to last Fedora kernels