The MM trees aren't here any more.

See git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm for the MM
git trees.

See https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches
for the raw quilt patches.

See https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/pc/devel-series
for the controlling quilt series file.