check_field_for_var_ref(9)

💖 NAME 💖

okay so bestie, this is check_field_for_var_ref(9) from the Kernel API Manual — iconic behavior already. The name is literally the plot: check_field_for_var_ref — check if a VAR_REF field references a variable. no cap. 💅

---

🌸 SYNOPSIS 🌸

       struct hist_field * check_field_for_var_ref (struct hist_field
       *hist_field , struct hist_trigger_data *var_data , unsigned int var_idx
       );

---

💅 ARGUMENTS 💅

• hist_field — the VAR_REF field you're checking, bestie. that's the main character here.
• var_data — the hist trigger that owns the variable. like, who's in charge of this variable? this one. 👑
• var_idx — the trigger variable identifier. the little name tag for the variable. 🎀

---

🦋 DESCRIPTION 🦋

okay so this function checks the given VAR_REF field to see whether or not it references the given variable associated with the given trigger. that's it, that's the vibe check. lowkey simple, highkey useful. ✨

---

🎀 RETURN 🎀

it gives you back the VAR_REF field if it does reference the variable, and NULL if not. no extra drama, just facts. 🫶

---

👑 SEE ALSO 👑

the related kernel lore lives in the kernel file ./kernel/trace/trace_events_hist.c, and the whole squad is: find_var_ref(9), find_any_var_ref(9), check_var_refs(9), create_var_ref(9), create_field_var_hist(9), create_target_field_var(9). go read those next, iykyk. 📚💖

---

that's the whole page, bestie — check_field_for_var_ref(9) comes from the Kernel API Manual, source ./kernel/trace, dated October 2026. byeee 🫶✨