__for_each_mem_range_rev(9)

💅 __for_each_mem_range_rev(9) ✨

okay so bestie, welcome to the Kernel API Manual 🫶 — this one's a macro page, and it's lowkey iconic. buckle up.

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🎀 NAME 🎀

__for_each_mem_range_rev — reverse iterate through memblock areas from type_a and not included in type_b. Or just type_a if type_b is NULL. 🦋

like... it walks backwards through your memblock areas, and it'll filter out whatever's in type_b. and if type_b is NULL? no filtering, we just vibe with type_a alone. periodt.

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✨ SYNOPSIS ✨

__for_each_mem_range_rev (i , type_a , type_b , nid , flags , p_start ,
p_end , p_nid );

eight arguments, no cap. let's get into them 💖

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🌸 ARGUMENTS 🌸

• i — a u64 used as the loop variable. it's the main character of the iteration, honestly 👑
• type_a — ptr to memblock_type to iterate. this is the one we're actually walking through 💫
• type_b — ptr to memblock_type which excludes from the iteration. it's giving "you're not invited to the party" energy 🙈
• nid — node selector, use NUMA_NO_NODE for all nodes. all of them, bestie, we're not picking favorites 🌈
• flags — pick from blocks based on memory attributes. this is your vibe check for which blocks make the cut ✨
• p_start — ptr to phys_addr_t for start address of the range, can be NULL. no pressure if you don't wanna pass it 🫶
• p_end — ptr to phys_addr_t for end address of the range, can be NULL. same deal, optional and valid 😌
• p_nid — ptr to int for nid of the range, can be NULL. three out of three optional pointers, we love a flexible icon 💅

ngl, those last three being nullable is a whole mood — pass them if you want the info, skip them if you don't. the macro does not care. 💀

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🔥 SEE ALSO 🔥

all the sibling macros and structs, fr fr — go read them, they're literally family:

Kernel file ./include/linux/memblock.h 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(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)

that's nineteen references, bestie. nineteen. ate and left no crumbs 🍓

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🧚 sign-off 🧚

this lil masterpiece lives in ./include/linux, dated October 2026, and it's forever known as __for_each_mem_range_rev(9). mwah 💜 go iterate backwards, you've got this 🔥👑