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Commit f4f4be2b authored by Tejun Heo's avatar Tejun Heo
Browse files

cgroup: use kzalloc() instead of kmalloc() 



There's no point in using kmalloc() instead of the clearing variant
for trivial stuff.  We can live dangerously elsewhere.  Use kzalloc()
instead and drop 0 inits.

While at it, do trivial code reorganization in cgroup_file_open().

This patch doesn't introduce any functional changes.

v2: I was caught in the very distant past where list_del() didn't
    poison and the initial version converted list_del()s to
    list_del_init()s too.  Li and Kent took me out of the stasis
    chamber.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: Kent Overstreet <koverstreet@google.com>
Acked-by: default avatarLi Zefan <lizefan@huawei.com>
parent 69d0206c

kernel/cgroup.c

+7 −7
Original line number Diff line number Diff line
@@ -597,7 +597,7 @@ static int allocate_cgrp_cset_links(int count, struct list_head *tmp_links) 
	INIT_LIST_HEAD(tmp_links);



	for (i = 0; i < count; i++) {

		link = kmalloc(sizeof(*link), GFP_KERNEL);

		link = kzalloc(sizeof(*link), GFP_KERNEL);

		if (!link) {

			free_cgrp_cset_links(tmp_links);

			return -ENOMEM;
@@ -658,7 +658,7 @@ static struct css_set *find_css_set(struct css_set *old_cset, 
	if (cset)

		return cset;



	cset = kmalloc(sizeof(*cset), GFP_KERNEL);

	cset = kzalloc(sizeof(*cset), GFP_KERNEL);

	if (!cset)

		return NULL;
@@ -2475,10 +2475,12 @@ static int cgroup_file_open(struct inode *inode, struct file *file) 
	cft = __d_cft(file->f_dentry);



	if (cft->read_map || cft->read_seq_string) {

		struct cgroup_seqfile_state *state =

			kzalloc(sizeof(*state), GFP_USER);

		struct cgroup_seqfile_state *state;



		state = kzalloc(sizeof(*state), GFP_USER);

		if (!state)

			return -ENOMEM;



		state->cft = cft;

		state->cgroup = __d_cgrp(file->f_dentry->d_parent);

		file->f_op = &cgroup_seqfile_operations;
@@ -3511,7 +3513,7 @@ static struct cgroup_pidlist *cgroup_pidlist_find(struct cgroup *cgrp, 
		}

	}

	/* entry not found; create a new one */

	l = kmalloc(sizeof(struct cgroup_pidlist), GFP_KERNEL);

	l = kzalloc(sizeof(struct cgroup_pidlist), GFP_KERNEL);

	if (!l) {

		mutex_unlock(&cgrp->pidlist_mutex);

		return l;
@@ -3520,8 +3522,6 @@ static struct cgroup_pidlist *cgroup_pidlist_find(struct cgroup *cgrp, 
	down_write(&l->mutex);

	l->key.type = type;

	l->key.ns = get_pid_ns(ns);

	l->use_count = 0; /* don't increment here */

	l->list = NULL;

	l->owner = cgrp;

	list_add(&l->links, &cgrp->pidlists);

	mutex_unlock(&cgrp->pidlist_mutex);