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cgroup/cpuset: Miscellaneous code cleanup

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Use more descriptive variable names for update_prstate(), remove
unnecessary code and fix some typos. There is no functional change.

Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Waiman Long 2021-07-20 10:18:26 -04:00 committed by Tejun Heo
parent 1f8c543f14
commit 0f3adb8a1e
1 changed files with 19 additions and 21 deletions
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40
kernel/cgroup/cpuset.c
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@ -1114,7 +1114,7 @@ enum subparts_cmd {
* cpus_allowed can be granted or an error code will be returned.
*
* For partcmd_disable, the cpuset is being transofrmed from a partition
* root back to a non-partition root. any CPUs in cpus_allowed that are in
* root back to a non-partition root. Any CPUs in cpus_allowed that are in
* parent's subparts_cpus will be taken away from that cpumask and put back
* into parent's effective_cpus. 0 should always be returned.
*
@ -1225,7 +1225,7 @@ static int update_parent_subparts_cpumask(struct cpuset *cpuset, int cmd,
/*
* partcmd_update w/o newmask:
*
* addmask = cpus_allowed & parent->effectiveb_cpus
* addmask = cpus_allowed & parent->effective_cpus
*
* Note that parent's subparts_cpus may have been
* pre-shrunk in case there is a change in the cpu list.
@ -1365,12 +1365,12 @@ static void update_cpumasks_hier(struct cpuset *cs, struct tmpmasks *tmp)
case PRS_DISABLED:
/*
* If parent is not a partition root or an
* invalid partition root, clear the state
* state and the CS_CPU_EXCLUSIVE flag.
* invalid partition root, clear its state
* and its CS_CPU_EXCLUSIVE flag.
*/
WARN_ON_ONCE(cp->partition_root_state
!= PRS_ERROR);
cp->partition_root_state = 0;
cp->partition_root_state = PRS_DISABLED;
/*
* clear_bit() is an atomic operation and
@ -1937,30 +1937,28 @@ out:
/*
* update_prstate - update partititon_root_state
* cs: the cpuset to update
* val: 0 - disabled, 1 - enabled
* cs: the cpuset to update
* new_prs: new partition root state
*
* Call with cpuset_mutex held.
*/
static int update_prstate(struct cpuset *cs, int val)
static int update_prstate(struct cpuset *cs, int new_prs)
{
int err;
struct cpuset *parent = parent_cs(cs);
struct tmpmasks tmp;
struct tmpmasks tmpmask;
if ((val != 0) && (val != 1))
return -EINVAL;
if (val == cs->partition_root_state)
if (new_prs == cs->partition_root_state)
return 0;
/*
* Cannot force a partial or invalid partition root to a full
* partition root.
*/
if (val && cs->partition_root_state)
if (new_prs && (cs->partition_root_state < 0))
return -EINVAL;
if (alloc_cpumasks(NULL, &tmp))
if (alloc_cpumasks(NULL, &tmpmask))
return -ENOMEM;
err = -EINVAL;
@ -1978,7 +1976,7 @@ static int update_prstate(struct cpuset *cs, int val)
goto out;
err = update_parent_subparts_cpumask(cs, partcmd_enable,
NULL, &tmp);
NULL, &tmpmask);
if (err) {
update_flag(CS_CPU_EXCLUSIVE, cs, 0);
goto out;
@ -1990,18 +1988,18 @@ static int update_prstate(struct cpuset *cs, int val)
* CS_CPU_EXCLUSIVE bit.
*/
if (cs->partition_root_state == PRS_ERROR) {
cs->partition_root_state = 0;
cs->partition_root_state = PRS_DISABLED;
update_flag(CS_CPU_EXCLUSIVE, cs, 0);
err = 0;
goto out;
}
err = update_parent_subparts_cpumask(cs, partcmd_disable,
NULL, &tmp);
NULL, &tmpmask);
if (err)
goto out;
cs->partition_root_state = 0;
cs->partition_root_state = PRS_DISABLED;
/* Turning off CS_CPU_EXCLUSIVE will not return error */
update_flag(CS_CPU_EXCLUSIVE, cs, 0);
@ -2015,11 +2013,11 @@ static int update_prstate(struct cpuset *cs, int val)
update_tasks_cpumask(parent);
if (parent->child_ecpus_count)
update_sibling_cpumasks(parent, cs, &tmp);
update_sibling_cpumasks(parent, cs, &tmpmask);
rebuild_sched_domains_locked();
out:
free_cpumasks(NULL, &tmp);
free_cpumasks(NULL, &tmpmask);
return err;
}
@ -3060,7 +3058,7 @@ retry:
goto retry;
}
parent = parent_cs(cs);
parent = parent_cs(cs);
compute_effective_cpumask(&new_cpus, cs, parent);
nodes_and(new_mems, cs->mems_allowed, parent->effective_mems);