The patch titled
cgroups: remove rcu_read_lock() in cgroupstats_build()
has been removed from the -mm tree. Its filename was
cgroups-remove-rcu_read_lock-in-cgroupstats_build.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: cgroups: remove rcu_read_lock() in cgroupstats_build()
From: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
cgroup_iter_* do not need rcu_read_lock().
In cgroup_enable_task_cg_lists(), do_each_thread() and while_each_thread()
are protected by RCU, it's OK, for write_lock(&css_set_lock) implies
rcu_read_lock() in non-RT kernel.
If we need explicit rcu_read_lock(), we should add rcu_read_lock() in
cgroup_enable_task_cg_lists(), not cgroup_iter_*.
Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
Acked-by: Paul Menage <menage@xxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/cgroup.c | 2 --
1 file changed, 2 deletions(-)
diff -puN kernel/cgroup.c~cgroups-remove-rcu_read_lock-in-cgroupstats_build kernel/cgroup.c
--- a/kernel/cgroup.c~cgroups-remove-rcu_read_lock-in-cgroupstats_build
+++ a/kernel/cgroup.c
@@ -2055,7 +2055,6 @@ int cgroupstats_build(struct cgroupstats
ret = 0;
cgrp = dentry->d_fsdata;
- rcu_read_lock();
cgroup_iter_start(cgrp, &it);
while ((tsk = cgroup_iter_next(cgrp, &it))) {
@@ -2080,7 +2079,6 @@ int cgroupstats_build(struct cgroupstats
}
cgroup_iter_end(cgrp, &it);
- rcu_read_unlock();
err:
return ret;
}
_
Patches currently in -mm which might be from laijs@xxxxxxxxxxxxxx are
origin.patch
linux-next.patch
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