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: Daniel Wagner <daniel.wagner@bmw-carit.de> Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com> Acked-by: Neil 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
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@ -49,16 +49,10 @@ extern const struct file_operations proc_cgroup_operations;
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#define IS_SUBSYS_ENABLED(option) IS_ENABLED(option)
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enum cgroup_subsys_id {
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#include <linux/cgroup_subsys.h>
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__CGROUP_TEMPORARY_PLACEHOLDER
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CGROUP_SUBSYS_COUNT,
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};
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#undef IS_SUBSYS_ENABLED
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#undef SUBSYS
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/*
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* This define indicates the maximum number of subsystems that can be loaded
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* at once. We limit to this many since cgroupfs_root has subsys_bits to keep
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* track of all of them.
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*/
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#define CGROUP_SUBSYS_COUNT (BITS_PER_BYTE*sizeof(unsigned long))
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/* Per-subsystem/per-cgroup state maintained by the system. */
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struct cgroup_subsys_state {
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