css_tryget_online(9)

💅 css_tryget_online(9) — a Kernel API Manual moment

okay so bestie, we're in the Kernel API Manual today and the main character is literally css_tryget_online ✨ like that's the whole vibe, that's the function, no cap.

🌸 NAME

css_tryget_online — try to obtain a reference on the specified css if online 🎀

🦋 SYNOPSIS

CGROUP_REF_FN_ATTRS bool css_tryget_online (struct cgroup_subsys_state
*css );

💜 ARGUMENTS

• css — the target css 👑 (yes that's it, that's the whole argument, she's lowkey simple like that)

🔥 DESCRIPTION

Obtain a reference on css if it's online. periodt.

The caller naturally needs to make sure that css is accessible, but — and this is the slay part — the caller doesn't have to be holding a reference on it already. IOW, RCU protected access is good enough for this function 💅 iykyk.

Returns true if a reference count was successfully obtained; false otherwise. iconic behavior honestly 🫶

ngl, keep that "accessible but not necessarily referenced" distinction in your head, bestie — it's literally the whole point of this one 🌈

⭐ SEE ALSO

Kernel file ./include/linux/cgroup_refcnt.h → css_get(9), css_get_many(9), css_tryget(9), css_put(9), css_put_many(9) 🌸 the whole friend group fr fr

and that's a wrap, bestie 🎀 this page lives in ./include/linux, brought to you by the October 2026 era, and it's called css_tryget_online(9) — go get that reference (if she's online) 💖✨