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rbtree, perf: Use new rbtree helpers

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Reduce rbtree boiler plate by using the new helpers.

One noteworthy change is unification of the various (partial) compare
functions. We construct a subtree match by forcing the sub-order to
always match, see __group_cmp().

Due to 'const' we had to touch cgroup_id().

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Davidlohr Bueso <dbueso@suse.de>
This commit is contained in:
Peter Zijlstra 2020-04-29 17:05:15 +02:00 • committed by Ingo Molnar
parent 8ecca39483
commit a3b8986455
2 changed files with 92 additions and 107 deletions
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4
include/linux/cgroup.h
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@ -307,7 +307,7 @@ void css_task_iter_end(struct css_task_iter *it);
* Inline functions.
*/
static inline u64 cgroup_id(struct cgroup *cgrp)
static inline u64 cgroup_id(const struct cgroup *cgrp)
{
return cgrp->kn->id;
}
@ -701,7 +701,7 @@ void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen);
struct cgroup_subsys_state;
struct cgroup;
static inline u64 cgroup_id(struct cgroup *cgrp) { return 1; }
static inline u64 cgroup_id(const struct cgroup *cgrp) { return 1; }
static inline void css_get(struct cgroup_subsys_state *css) {}
static inline void css_put(struct cgroup_subsys_state *css) {}
static inline int cgroup_attach_task_all(struct task_struct *from,