From f868089b09b51bd17ee41dedb96f98a1d0952fec Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Thu, 29 May 2014 11:45:57 -0400
Subject: [PATCH] NFS: Fix a potential busy wait in nfs_page_group_lock

We cannot allow nfs_page_group_lock to use TASK_KILLABLE here, since
the loop would cause a busy wait if somebody kills the task.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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