sg_dma_unmark_bus_address(9)

💅 sg_dma_unmark_bus_address — a Kernel API Manual moment

okay so bestie, welcome to the Kernel API Manual entry for sg_dma_unmark_bus_address, and honestly? she's a tiny little legend. short page, big "i just cleared a flag" energy. let's get into it ✨

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🌸 NAME 🌸

sg_dma_unmark_bus_address — unmark the scatterlist entry as a bus address 🎀

like, you're undoing the marking. the un-marking. the take-it-back. we love a reversible queen.

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✨ SYNOPSIS ✨

void sg_dma_unmark_bus_address (struct scatterlist *sg );

that's it. that's the whole call. void return, so no "did it work?" drama — she simply does the thing and dips 🦋

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🫶 ARGUMENTS 🫶

• sg — SG entry. that's the scatterlist entry you're operating on, bestie. the one and only thing you hand her 💖

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🔥 DESCRIPTION 🔥

Clears the bus address mark. 💅

that's the whole bit, no cap. no extra steps, no secret second meaning, no hidden side quest — the bus address mark gets cleared, and that's the moment. iconic behaviour honestly. ⭐

lowkey important vibe check: this is the counterpart to marking it in the first place — you're wiping the mark off, not doing anything else. don't go reading extra features into it 🙈

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🌈 SEE ALSO 🌈

Kernel file ./include/linux/scatterlist.h — go say hi, she's the source of truth 👑

the full scatterlist friend group, all present and accounted for, no one left out of the group chat:

sg_next(9), sg_assign_page(9), sg_set_page(9), sg_set_folio(9), sg_set_buf(9), sg_chain(9), sg_mark_end(9), sg_unmark_end(9), sg_dma_is_bus_address(9), sg_dma_mark_bus_address(9), sg_dma_is_swiotlb(9), sg_dma_mark_swiotlb(9), sg_phys(9), sg_virt(9), sg_init_marker(9), sg_alloc_table_from_pages(9), sg_page_iter_page(9), sg_page_iter_dma_address(9), for_each_sg_page(9), for_each_sg_dma_page(9), for_each_sgtable_page(9), for_each_sgtable_dma_page(9)

like, the whole squad. truly a friend group that shows up for each other 🧚💜

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and that's the page!! sign-off time: this little beauty lives at ./include/linux, from October 2026, and she's part of the Kernel API Manual — so if you ever forget what she does, just remember: she clears the bus address mark. that's the whole personality and we're obsessed 🍓👑