for_each_mem_range(9)

💖 for_each_mem_range(9) 💖

okay so real quick — this is a page from the Kernel API Manual, and honestly? it's a little guy but it does things. stay with me bestie 🫶

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✨ NAME ✨

for_each_mem_range — iterate through memory areas. that's it, that's the whole vibe. it walks you through the memory regions one at a time like a little tour guide 🧚

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🌸 SYNOPSIS 🌸

for_each_mem_range (i , p_start , p_end );

no cap, that's the whole call. short and iconic 💅

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🎀 ARGUMENTS 🎀

• i — a u64 used as the loop variable. yeah. it's the counter, the main character of the loop, the little number that keeps going 🔥
• p_start — a ptr to phys_addr_t for the start address of the range. it can be NULL — like, no pressure, it's flexible 🌸
• p_end — a ptr to phys_addr_t for the end address of the range. also can be NULL. both of them are allowed to ghost you, lowkey 💀

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🦋 SEE ALSO 🦋

so the whole friend group lives in the kernel file ./include/linux/memblock.h, and honestly the squad is deep. here's everyone:

• enum memblock_flags(9)
• struct memblock_region(9)
• struct memblock_type(9)
• struct memblock(9)
• for_each_physmem_range(9)
• __for_each_mem_range(9)
• __for_each_mem_range_rev(9)
• for_each_mem_range_rev(9)
• for_each_reserved_mem_range(9)
• for_each_mem_pfn_range(9)
• for_each_free_mem_range(9)
• for_each_free_mem_range_reverse(9)
• memblock_set_current_limit(9)
• memblock_region_memory_base_pfn(9)
• memblock_region_memory_end_pfn(9)
• memblock_region_reserved_base_pfn(9)
• memblock_region_reserved_end_pfn(9)
• for_each_mem_region(9)
• for_each_reserved_mem_region(9)

the way that list just keeps going 😭 go read them, iykyk ⭐

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that's the whole page bestie, short, sweet, and absolutely serving kernel documentation energy 👑

sign-off szn: this one's sourced from ./include/linux, dated October 2026, and it's the for_each_mem_range(9) page — periodt 💜