iosys_map_clear(9)

✨ iosys_map_clear(9) — the Kernel API Manual moment 💅

okay so this is a page from the Kernel API Manual (iosys_map_clear(9)), and honestly? It's a little reset button and I'm obsessed. Let's get into it 🫶

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🌸 NAME 🌸

iosys_map_clear — clears a iosys_map mapping structure. that's it. that's the whole gig. and she eats every time ✨

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🎀 SYNOPSIS 🎀

void iosys_map_clear (struct iosys_map *map );

literally just hand her a pointer and she handles the rest, no cap 💖

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🦋 ARGUMENTS 🦋

• map — the iosys_map structure. bestie, this is the one you're wiping clean 🌸

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👑 DESCRIPTION 👑

okay so here's the vibe: iosys_map_clear clears all fields to zero, and yes that includes struct iosys_map.is_iomem 👀 so any mapping structure that was set to point to I/O memory gets reset back for system memory. the pointers? cleared to NULL. gone. dusted. iconic 💀✨

and lowkey the important part — this is the default. so if you weren't sure what state a fresh-ish map should be in, it's this one. zeroes across the board, no iomem flag, pointers null. periodt 🔥

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🌈 SEE ALSO 🌈

the whole friend group, fr fr:

• kernel file ./include/linux/iosys-map.h overview(9)
• struct iosys_map(9)
• IOSYS_MAP_INIT_VADDR(9)
• IOSYS_MAP_INIT_VADDR_IOMEM(9)
• IOSYS_MAP_INIT_OFFSET(9)
• iosys_map_set_vaddr(9)
• iosys_map_set_vaddr_iomem(9)
• iosys_map_is_equal(9)
• iosys_map_is_null(9)
• iosys_map_is_set(9)
• iosys_map_memcpy_to(9)
• iosys_map_memcpy_from(9)
• iosys_map_incr(9)
• iosys_map_memset(9)
• iosys_map_rd(9)
• iosys_map_wr(9)
• iosys_map_rd_field(9)
• iosys_map_wr_field(9)

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ngl if you're touching I/O memory mappings, read is_iomem twice. she flips back to system memory the moment you clear her 💅

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and that's the whole page, bestie 🧚💜 this one's living in ./include/linux, stamped October 2026 — go clear some maps, iykyk ⭐🍓