Commit a6f00298 authored by Daniel Wagner's avatar Daniel Wagner Committed by Tejun Heo

cgroup: Define CGROUP_SUBSYS_COUNT according the configuration

Since we know exactly how many subsystems exists at compile time we are
able to define CGROUP_SUBSYS_COUNT correctly. CGROUP_SUBSYS_COUNT will
be at max 12 (all controllers enabled). Depending on the architecture
we safe either 32 - 12 pointers (80 bytes) or 64 - 12 pointers (416
bytes) per cgroup.

With this change we can also remove the temporary placeholder to avoid
compilation errors.
Signed-off-by: default avatarDaniel Wagner <daniel.wagner@bmw-carit.de>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarLi Zefan <lizefan@huawei.com>
Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
Cc: Gao feng <gaofeng@cn.fujitsu.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: John Fastabend <john.r.fastabend@intel.com>
Cc: netdev@vger.kernel.org
Cc: cgroups@vger.kernel.org
parent 8a8e04df
...@@ -49,16 +49,10 @@ extern const struct file_operations proc_cgroup_operations; ...@@ -49,16 +49,10 @@ extern const struct file_operations proc_cgroup_operations;
#define IS_SUBSYS_ENABLED(option) IS_ENABLED(option) #define IS_SUBSYS_ENABLED(option) IS_ENABLED(option)
enum cgroup_subsys_id { enum cgroup_subsys_id {
#include <linux/cgroup_subsys.h> #include <linux/cgroup_subsys.h>
__CGROUP_TEMPORARY_PLACEHOLDER CGROUP_SUBSYS_COUNT,
}; };
#undef IS_SUBSYS_ENABLED #undef IS_SUBSYS_ENABLED
#undef SUBSYS #undef SUBSYS
/*
* This define indicates the maximum number of subsystems that can be loaded
* at once. We limit to this many since cgroupfs_root has subsys_bits to keep
* track of all of them.
*/
#define CGROUP_SUBSYS_COUNT (BITS_PER_BYTE*sizeof(unsigned long))
/* Per-subsystem/per-cgroup state maintained by the system. */ /* Per-subsystem/per-cgroup state maintained by the system. */
struct cgroup_subsys_state { struct cgroup_subsys_state {
......
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