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Revert "cgroup: add cgroup_subsys->css_e_css_changed()" 

This reverts commit 56c807ba4e.

cgroup_subsys->css_e_css_changed() was supposed to be used by cgroup
writeback support; however, the change to per-inode cgroup association
made it unnecessary and the callback doesn't have any user.  Remove
it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
This commit is contained in:
Tejun Heo 2016-02-22 22:25:46 -05:00
parent b598dde354
commit 5eb385cc5a
2 changed files with 0 additions and 19 deletions
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1
include/linux/cgroup-defs.h
View File

@ -434,7 +434,6 @@ struct cgroup_subsys {
void (*css_released)(struct cgroup_subsys_state *css); void (*css_released)(struct cgroup_subsys_state *css);
void (*css_free)(struct cgroup_subsys_state *css); void (*css_free)(struct cgroup_subsys_state *css);
void (*css_reset)(struct cgroup_subsys_state *css); void (*css_reset)(struct cgroup_subsys_state *css);
void (*css_e_css_changed)(struct cgroup_subsys_state *css);
int (*can_attach)(struct cgroup_taskset *tset); int (*can_attach)(struct cgroup_taskset *tset);
void (*cancel_attach)(struct cgroup_taskset *tset); void (*cancel_attach)(struct cgroup_taskset *tset);

18
kernel/cgroup.c
View File

@ -3127,24 +3127,6 @@ static ssize_t cgroup_subtree_control_write(struct kernfs_open_file *of,
} }
} }
/*
* The effective csses of all the descendants (excluding @cgrp) may
* have changed. Subsystems can optionally subscribe to this event
* by implementing ->css_e_css_changed() which is invoked if any of
* the effective csses seen from the css's cgroup may have changed.
*/
for_each_subsys(ss, ssid) {
struct cgroup_subsys_state *this_css = cgroup_css(cgrp, ss);
struct cgroup_subsys_state *css;
if (!ss->css_e_css_changed || !this_css)
continue;
css_for_each_descendant_pre(css, this_css)
if (css != this_css)
ss->css_e_css_changed(css);
}
kernfs_activate(cgrp->kn); kernfs_activate(cgrp->kn);
ret = 0; ret = 0;
out_unlock: out_unlock: