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block: fix a build error

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The code is only for blkcg not for all cgroups

Fixes: d4478e92d6 ("block/loop: make loop cgroup aware")
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Shaohua Li 2017-09-26 11:02:12 -07:00 committed by Jens Axboe
parent 9979d545c9
commit 0b508bc926
3 changed files with 6 additions and 6 deletions
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2
drivers/block/loop.c
View File

@ -1692,7 +1692,7 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
}
/* always use the first bio's css */
#ifdef CONFIG_CGROUPS
#ifdef CONFIG_BLK_CGROUP
if (cmd->use_aio && cmd->rq->bio && cmd->rq->bio->bi_css) {
cmd->css = cmd->rq->bio->bi_css;
css_get(cmd->css);

2
include/linux/kthread.h
View File

@ -199,7 +199,7 @@ bool kthread_cancel_delayed_work_sync(struct kthread_delayed_work *work);
void kthread_destroy_worker(struct kthread_worker *worker);
#ifdef CONFIG_CGROUPS
#ifdef CONFIG_BLK_CGROUP
void kthread_associate_blkcg(struct cgroup_subsys_state *css);
struct cgroup_subsys_state *kthread_blkcg(void);
#else

8
kernel/kthread.c
View File

@ -46,7 +46,7 @@ struct kthread {
void *data;
struct completion parked;
struct completion exited;
#ifdef CONFIG_CGROUPS
#ifdef CONFIG_BLK_CGROUP
struct cgroup_subsys_state *blkcg_css;
#endif
};
@ -83,7 +83,7 @@ void free_kthread_struct(struct task_struct *k)
* or if kmalloc() in kthread() failed.
*/
kthread = to_kthread(k);
#ifdef CONFIG_CGROUPS
#ifdef CONFIG_BLK_CGROUP
WARN_ON_ONCE(kthread && kthread->blkcg_css);
#endif
kfree(kthread);
@ -224,7 +224,7 @@ static int kthread(void *_create)
self->data = data;
init_completion(&self->exited);
init_completion(&self->parked);
#ifdef CONFIG_CGROUPS
#ifdef CONFIG_BLK_CGROUP
self->blkcg_css = NULL;
#endif
current->vfork_done = &self->exited;
@ -1166,7 +1166,7 @@ void kthread_destroy_worker(struct kthread_worker *worker)
}
EXPORT_SYMBOL(kthread_destroy_worker);
#ifdef CONFIG_CGROUPS
#ifdef CONFIG_BLK_CGROUP
/**
* kthread_associate_blkcg - associate blkcg to current kthread
* @css: the cgroup info