drm_fb_helper_deferred_io(9)

📦 version 7.3.1, in nixpkgs unstable

💅 drm_fb_helper_deferred_io(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for drm_fb_helper_deferred_io, and honestly? it's a little icon, a little workhorse, and you're gonna get it in like two minutes, i promise 🫶

🌸 NAME 🌸

drm_fb_helper_deferred_io — the fbdev deferred_io callback function, aka the lil function that shows up when the kernel's like "hey, someone wrote to the mmap'd framebuffer, deal with it" 💖

✨ SYNOPSIS ✨

void drm_fb_helper_deferred_io (struct fb_info *info , struct list_head
*pagereflist );

like, it returns void (no takebacks, no receipts 💅) and it takes two things. that's it. that's the whole vibe.

🎀 ARGUMENTS 🎀

  • info — the fb_info struct pointer. yep. the fb_info. the main character of fbdev structs 👑
  • pagereflist — a list of the mmap framebuffer pages that have to be flushed. it's literally a to-do list of pages that need to get written out, and this function is the one running the errands 🦋

💖 DESCRIPTION 💖

so here's the tea ☕ — this function is used as the fb_deferred_io.deferred_io callback function, and its whole job is flushing the fbdev mmap writes. that's it. that's the assignment. deferred, then flushed. no cap 🔥

🌈 SEE ALSO 🌈

the kernel file lives at ./drivers/gpu/drm/drm_fb_helper.c, and here's the whole friend group — the fbdev helpers(9) and every sibling function you could ever want:

ok that's the whole page, go forth and flush responsibly bestie 😭💜

and that's a wrap, babes 🎀 this came out of ./drivers/gpu/drm, dated October 2026 — slay, iconic, periodt 💅✨

📦 where this page comes from