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cgroup: kill cgrp_ss_priv[CGROUP_CANFORK_COUNT] and friends

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Now that nobody use the "priv" arg passed to can_fork/cancel_fork/fork we can
kill CGROUP_CANFORK_COUNT/SUBSYS_TAG/etc and cgrp_ss_priv[] in copy_process().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Oleg Nesterov
2015-12-03 10:24:08 -05:00
committed by Tejun Heo
parent 8075b542cf
commit b53202e630
8 changed files with 23 additions and 71 deletions
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30
kernel/cgroup.c
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@@ -5488,19 +5488,6 @@ static const struct file_operations proc_cgroupstats_operations = {
.release = single_release,
};
static void **subsys_canfork_priv_p(void *ss_priv[CGROUP_CANFORK_COUNT], int i)
{
if (CGROUP_CANFORK_START <= i && i < CGROUP_CANFORK_END)
return &ss_priv[i - CGROUP_CANFORK_START];
return NULL;
}
static void *subsys_canfork_priv(void *ss_priv[CGROUP_CANFORK_COUNT], int i)
{
void **private = subsys_canfork_priv_p(ss_priv, i);
return private ? *private : NULL;
}
/**
* cgroup_fork - initialize cgroup related fields during copy_process()
* @child: pointer to task_struct of forking parent process.
@@ -5523,14 +5510,13 @@ void cgroup_fork(struct task_struct *child)
* returns an error, the fork aborts with that error code. This allows for
* a cgroup subsystem to conditionally allow or deny new forks.
*/
int cgroup_can_fork(struct task_struct *child,
void *ss_priv[CGROUP_CANFORK_COUNT])
int cgroup_can_fork(struct task_struct *child)
{
struct cgroup_subsys *ss;
int i, j, ret;
for_each_subsys_which(ss, i, &have_canfork_callback) {
ret = ss->can_fork(child, subsys_canfork_priv_p(ss_priv, i));
ret = ss->can_fork(child);
if (ret)
goto out_revert;
}
@@ -5542,7 +5528,7 @@ out_revert:
if (j >= i)
break;
if (ss->cancel_fork)
ss->cancel_fork(child, subsys_canfork_priv(ss_priv, j));
ss->cancel_fork(child);
}
return ret;
@@ -5555,15 +5541,14 @@ out_revert:
* This calls the cancel_fork() callbacks if a fork failed *after*
* cgroup_can_fork() succeded.
*/
void cgroup_cancel_fork(struct task_struct *child,
void *ss_priv[CGROUP_CANFORK_COUNT])
void cgroup_cancel_fork(struct task_struct *child)
{
struct cgroup_subsys *ss;
int i;
for_each_subsys(ss, i)
if (ss->cancel_fork)
ss->cancel_fork(child, subsys_canfork_priv(ss_priv, i));
ss->cancel_fork(child);
}
/**
@@ -5576,8 +5561,7 @@ void cgroup_cancel_fork(struct task_struct *child,
* cgroup_task_iter_start() - to guarantee that the new task ends up on its
* list.
*/
void cgroup_post_fork(struct task_struct *child,
void *old_ss_priv[CGROUP_CANFORK_COUNT])
void cgroup_post_fork(struct task_struct *child)
{
struct cgroup_subsys *ss;
int i;
@@ -5621,7 +5605,7 @@ void cgroup_post_fork(struct task_struct *child,
* and addition to css_set.
*/
for_each_subsys_which(ss, i, &have_fork_callback)
ss->fork(child, subsys_canfork_priv(old_ss_priv, i));
ss->fork(child);
}
/**