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include/cgroup: separate {get,put}_cgroup_ns no-op case 

When CONFIG_CGROUPS is not selected, {get,put}_cgroup_ns become no-ops
and therefore it is not necessary to compile in the code for changing
the reference count.

When CONFIG_CGROUP is selected, there is no valid case where
either of {get,put}_cgroup_ns() will be called with a NULL argument.

Signed-off-by: Joel Savitz <jsavitz@redhat.com>
Link: https://lore.kernel.org/20250508184930.183040-3-jsavitz@redhat.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
pull/1250/head
Joel Savitz 2025-05-08 14:49:30 -04:00 committed by Christian Brauner
parent 5caa2d89b7
commit 79fb8d8d93
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1 changed files with 14 additions and 12 deletions
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26
include/linux/cgroup.h
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@ -785,6 +785,17 @@ struct cgroup_namespace *copy_cgroup_ns(unsigned long flags,
int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen, int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
struct cgroup_namespace *ns); struct cgroup_namespace *ns);
static inline void get_cgroup_ns(struct cgroup_namespace *ns)
{
refcount_inc(&ns->ns.count);
}
static inline void put_cgroup_ns(struct cgroup_namespace *ns)
{
if (refcount_dec_and_test(&ns->ns.count))
free_cgroup_ns(ns);
}
#else /* !CONFIG_CGROUPS */ #else /* !CONFIG_CGROUPS */
static inline void free_cgroup_ns(struct cgroup_namespace *ns) { } static inline void free_cgroup_ns(struct cgroup_namespace *ns) { }
@ -795,20 +806,11 @@ copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,
return old_ns; return old_ns;
} }
static inline void get_cgroup_ns(struct cgroup_namespace *ns) { }
static inline void put_cgroup_ns(struct cgroup_namespace *ns) { }
#endif /* !CONFIG_CGROUPS */ #endif /* !CONFIG_CGROUPS */
static inline void get_cgroup_ns(struct cgroup_namespace *ns)
{
if (ns)
refcount_inc(&ns->ns.count);
}
static inline void put_cgroup_ns(struct cgroup_namespace *ns)
{
if (ns && refcount_dec_and_test(&ns->ns.count))
free_cgroup_ns(ns);
}
#ifdef CONFIG_CGROUPS #ifdef CONFIG_CGROUPS
void cgroup_enter_frozen(void); void cgroup_enter_frozen(void);