__get_pfnblock_flags_mask(9)

💅 __get_pfnblock_flags_mask(9) — like, the Kernel API Manual edition 🎀

okay so bestie, gather round, because we're diving into the Kernel API Manual and honestly? this one's a lil niche but it's giving "I know things" energy and I'm obsessed. no cap, this is the function that goes and fetches you a whole group of flags for one pageblock_nr_pages block of pages. yes, that's the whole personality. ✨

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🌸 NAME 🌸

__get_pfnblock_flags_mask — literally returns the requested group of flags for a pageblock_nr_pages block of pages 🦋

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💖 SYNOPSIS 💖

unsigned long __get_pfnblock_flags_mask (const struct page *page ,
unsigned long pfn , unsigned long mask );

look at her. three args, one unsigned long return, main character energy only. 👑

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✨ ARGUMENTS ✨

• page — the page that lives inside the block of interest 🫶 like, the block you're curious about? she's in it.
• pfn — the target page frame number, aka the specific number you're pointing at ⭐
• mask — the mask of bits that the caller is interested in 💅 only the bits you care about, we love a filter.

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🔥 RETURN 🔥

pageblock_bits flags — that's what you get back, periodt. 🌈

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🧚 SEE ALSO 🧚

Kernel file ./mm/page_alloc.c — and fr fr, the whole friend group:

• get_pfnblock_bit(9)
• get_pfnblock_migratetype(9)
• __set_pfnblock_flags_mask(9)
• set_pfnblock_bit(9)
• clear_pfnblock_bit(9)
• set_pageblock_migratetype(9)
• __move_freepages_block_isolate(9)
• __putback_isolated_page(9)
• __free_pages(9)
• free_pages(9)
• alloc_pages_exact(9)
• alloc_pages_exact_nid(9)
• free_pages_exact(9)
• nr_free_zone_pages(9)
• nr_free_buffer_pages(9)
• find_next_best_node(9)
• free_reserved_pages(9)
• setup_per_zone_wmarks(9)
• __free_contig_range(9)
• alloc_contig_frozen_range(9)
• alloc_contig_range(9)
• alloc_contig_frozen_pages(9)
• alloc_contig_pages(9)
• free_contig_frozen_range(9)
• free_contig_range(9)
• alloc_pages_nolock(9)

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ngl bestie, the whole squad is in ./mm and they're all worth a lil read. iykyk 💀

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and that's the page!! sourced straight from ./mm, dated October 2026, and it's the Kernel API Manual through and through. mwah 💋 go get those pageblock flags, queen 🎀💜