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authorMandeep Singh Baines <msb@chromium.org>2012-01-04 06:18:30 +0100
committerTejun Heo <tj@kernel.org>2012-01-21 00:58:13 +0100
commitb78949ebfb563c29808a9d0a772e3adb5561bc80 (patch)
treed5b473db418a7480d314ffe36d428290d3603bfc /Kconfig
parentcgroup: move struct cgroup_pidlist out from the header file (diff)
downloadlinux-b78949ebfb563c29808a9d0a772e3adb5561bc80.tar.xz
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cgroup: simplify double-check locking in cgroup_attach_proc
To keep the complexity of the double-check locking in one place, move the thread_group_leader check up into attach_task_by_pid(). This allows us to use a goto instead of returning -EAGAIN. While at it, convert a couple of returns to gotos and use rcu for the !pid case also in order to simplify the logic. Changes in V2: * https://lkml.org/lkml/2011/12/22/86 (Tejun Heo) * Use a goto instead of returning -EAGAIN Signed-off-by: Mandeep Singh Baines <msb@chromium.org> Acked-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: containers@lists.linux-foundation.org Cc: cgroups@vger.kernel.org Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Paul Menage <paul@paulmenage.org>
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