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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697/** * css_get - obtain a reference on the specified css * @css: target css * * The caller must already have a reference. */CGROUP_REF_FN_ATTRSvoid css_get(struct cgroup_subsys_state *css){ if (!(css->flags & CSS_NO_REF)) percpu_ref_get(&css->refcnt);}CGROUP_REF_EXPORT(css_get)
/** * css_get_many - obtain references on the specified css * @css: target css * @n: number of references to get * * The caller must already have a reference. */CGROUP_REF_FN_ATTRSvoid css_get_many(struct cgroup_subsys_state *css, unsigned int n){ if (!(css->flags & CSS_NO_REF)) percpu_ref_get_many(&css->refcnt, n);}CGROUP_REF_EXPORT(css_get_many)
/** * css_tryget - try to obtain a reference on the specified css * @css: target css * * Obtain a reference on @css unless it already has reached zero and is * being released. This function doesn't care whether @css is on or * offline. The caller naturally needs to ensure that @css is accessible * but doesn't have to be holding a reference on it - IOW, RCU protected * access is good enough for this function. Returns %true if a reference * count was successfully obtained; %false otherwise. */CGROUP_REF_FN_ATTRSbool css_tryget(struct cgroup_subsys_state *css){ if (!(css->flags & CSS_NO_REF)) return percpu_ref_tryget(&css->refcnt); return true;}CGROUP_REF_EXPORT(css_tryget)
/** * css_tryget_online - try to obtain a reference on the specified css if online * @css: target css * * Obtain a reference on @css if it's online. The caller naturally needs * to ensure that @css is accessible but doesn't have to be holding a * reference on it - IOW, RCU protected access is good enough for this * function. Returns %true if a reference count was successfully obtained; * %false otherwise. */CGROUP_REF_FN_ATTRSbool css_tryget_online(struct cgroup_subsys_state *css){ if (!(css->flags & CSS_NO_REF)) return percpu_ref_tryget_live(&css->refcnt); return true;}CGROUP_REF_EXPORT(css_tryget_online)
/** * css_put - put a css reference * @css: target css * * Put a reference obtained via css_get() and css_tryget_online(). */CGROUP_REF_FN_ATTRSvoid css_put(struct cgroup_subsys_state *css){ if (!(css->flags & CSS_NO_REF)) percpu_ref_put(&css->refcnt);}CGROUP_REF_EXPORT(css_put)
/** * css_put_many - put css references * @css: target css * @n: number of references to put * * Put references obtained via css_get() and css_tryget_online(). */CGROUP_REF_FN_ATTRSvoid css_put_many(struct cgroup_subsys_state *css, unsigned int n){ if (!(css->flags & CSS_NO_REF)) percpu_ref_put_many(&css->refcnt, n);}CGROUP_REF_EXPORT(css_put_many)