page_ext_iter_begin(9)

💅 page_ext_iter_begin(9) — Kernel API Manual

okay so bestie, this is the page_ext_iter_begin(9) page from the Kernel API Manual, and it's literally here to prep you for iterating through page extensions. slay.

🌸 NAME

page_ext_iter_begin — Prepare for iterating through page extensions.

✨ SYNOPSIS

struct page_ext * page_ext_iter_begin (struct page_ext_iter *iter ,
unsigned long pfn , unsigned long count );

💖 ARGUMENTS

• iter — page extension iterator. the main character of this lil setup, ngl.
• pfn — PFN of the page we're interested in.
• count — maximum number of page extensions to return.

🦋 DESCRIPTION

Heads up, bestie: this one must be called with the RCU read lock taken. not optional, no cap.

🫶 RETURN

NULL if no page_ext exists for this page.

🔥 SEE ALSO

• Kernel file ./include/linux/page_ext.h
• struct page_ext_operations(9)
• page_ext_iter_next(9)
• page_ext_iter_get(9)
• for_each_page_ext(9)

signed off from ./include/linux, dated October 2026, on the page_ext_iter_begin(9) page in the Kernel API Manual — bye bestie, go iterate iconically 🎀✨