STRUCT GCOV_FN_INFO(9)

👑 struct gcov_fn_info(9) — Kernel API Manual 💅

okay bestie, welcome to the Kernel API Manual page for struct gcov_fn_info(9) — this is the profiling meta data per function situation, and it's lowkey iconic. 🫶

✨ NAME ✨

struct gcov_fn_info — profiling meta data per function. periodt. 💖

🦋 SYNOPSIS 🦋

       struct gcov_fn_info {
           const struct gcov_info *key;
           unsigned int ident;
           unsigned int lineno_checksum;
           unsigned int cfg_checksum;
           struct gcov_ctr_info ctrs[];
        };

💖 Members 💖

• key — comdat key. it's the vibe check for comdat selection.
• ident — unique ident of function. main character ID, fr fr. 👑
• lineno_checksum — function lineo_checksum. yes, lineo_checksum — that's what the page says, bestie; keep it cute and keep it exact. 🎀
• cfg_checksum — function cfg checksum.
• ctrs — instrumented counters. the trailing-array era has entered the chat. ✨

🌸 DESCRIPTION 🌸

okay so this data is generated by gcc during compilation and doesn't change at run-time. no cap — compile-time only, bestie. 😌

This is information about a single function. It uses the trailing array idiom — yes, the ctrs[] situation at the end. The number of counters is determined from the merge pointer array in gcov_info. 💅

The key is used to detect which of a set of comdat functions was selected — it points to the gcov_info object of the object file containing the selected comdat function. iykyk. 🔥

👑 SEE ALSO 👑

• Kernel file ./kernel/gcov/gcc_4_7.c
• struct gcov_ctr_info(9)
• struct gcov_info(9)
• gcov_info_filename(9)
• gcov_info_version(9)
• gcov_info_next(9)
• gcov_info_link(9)
• gcov_info_unlink(9)
• gcov_info_within_module(9)
• gcov_info_reset(9)
• gcov_info_is_compatible(9)
• gcov_info_add(9)
• gcov_info_dup(9)
• gcov_info_free(9)
• convert_to_gcda(9)

mwah 💋 — this gem came from source/version ./kernel/gcov, date October 2026, and the whole thing is giving kernel-doc royalty. 👑