iosys_map_is_null(9)

✨ NAME ✨

okay so bestie, meet iosys_map_is_null(9) from the Kernel API Manual 💅 — this icon literally tests for a iosys mapping to be NULL. That's the whole assignment. No cap. 🎀

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🦋 SYNOPSIS 🦋

bool iosys_map_is_null (const struct iosys_map *map );

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🌸 ARGUMENTS 🌸

• map — The iosys_map structure. Yep, that's the struct getting the vibe check, bestie. ✨

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💖 DESCRIPTION 💖

Depending on the state of struct iosys_map.is_iomem, this tests if the mapping is NULL.

So yeah: it peeks at struct iosys_map.is_iomem and, depending on that state, checks whether the mapping is NULL. Simple, iconic, to the point. 💁‍♀️

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🫶 RETURN 🫶

True if the mapping is NULL, or false otherwise.

That's it. That's the tea. 🍓

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🌈 SEE ALSO 🌈

• 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_set(9)
• iosys_map_clear(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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mwah 💋 — this cute little page comes from ./include/linux, dated October 2026, and yes bestie, it's still iosys_map_is_null(9). bye and slay 🫶👑