zfsonlinux/zfs — pull request #2975 by dweeezil (2014-12-18 16:20:58+00:00)
Title: Linux 3.12 compat: split shrinker has s_shrink

The split count/scan shrinker callbacks introduced in 3.12 broke the
test for HAVE_SHRINK, effectively disabling the per-superblock shrinkers.

This patch re-enables the per-superblock shrinkers when the split shrinker
callbacks have been detected.