STRUCT MSC_WIN_TO_USER_STRUCT(9)

✨ struct msc_win_to_user_struct — from the Kernel API Manual, bestie ✨

Okay so we're looking at struct msc_win_to_user_struct(9) today and honestly? It's a little guy. A tiny two-field struct that exists for exactly one reason and it's serving main character energy in the copy_to_user() callback department. Let's get into it 💅

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🎀 NAME 🎀

struct msc_win_to_user_struct — literally just the data you need for the copy_to_user() callback. That's it. That's the whole vibe.

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🌸 SYNOPSIS 🌸

struct msc_win_to_user_struct {
    char __user     *buf;
    unsigned long   offset;
 };

Yes bestie, that closing brace is indented exactly like that in the source. Not a typo on my end. We keep it real here. 🫶

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💖 Members 💖

• buf — the userspace buffer where your data is headed. It's a char __user *, so you know it's living over there on the other side of the userspace/kernel boundary. Be respectful to it. 🙈
• offset — a running offset, an unsigned long. It keeps track of where you are as you go. Iconic lowkey bookkeeping behaviour. ✨

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🦋 SEE ALSO 🦋

All the friends in the group chat, no cap:

• Kernel file ./drivers/hwtracing/intel_th/msu.c
• struct msc_window(9)
• struct msc_iter(9)
• struct msc(9)
• struct msu_buffer_entry(9)
• msc_is_last_win(9)
• msc_next_window(9)
• msc_find_window(9)
• msc_oldest_window(9)
• msc_win_oldest_sg(9)
• msc_buffer_iterate(9)
• msc_buffer_clear_hw_header(9)
• msc_configure(9)
• msc_disable(9)
• msc_buffer_contig_alloc(9)
• msc_buffer_contig_free(9)
• msc_buffer_contig_get_page(9)
• msc_buffer_win_alloc(9)
• msc_buffer_win_free(9)
• msc_buffer_relink(9)
• msc_buffer_free(9)
• msc_buffer_alloc(9)
• msc_buffer_unlocked_free_unless_used(9)
• msc_buffer_free_unless_used(9)
• msc_buffer_get_page(9)
• msc_win_to_user(9)
• intel_th_msc_window_unlock(9)

Like, the entire intel_th MSC extended universe is right there. Go read them all, I'll wait 💜

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Okay that's the whole page, bestie — short, sweet, two members and a dream. 🧚

This lil' cutie lives in ./drivers/hwtracing/intel_th and the page is dated October 2026 — so mark your calendar, future girlies. 🌈⭐🍓

Slay, and happy hacking 💖✨