ppc440spe_ad...xor_zero_sum(9)

📦 version 7.3.1, in nixpkgs unstable

💅 NAME 💅

ppc440spe_adma_prep_dma_xor_zero_sum — bestie, this one prepares a CDB group for an XOR ZERO_SUM operation. That's it, that's the whole vibe ✨

This page lives in the Kernel API Manual, and the function it's hyping up is ppc440spe_ad...xor_zero_sum(9) 🎀

🌸 SYNOPSIS 🌸

struct dma_async_tx_descriptor * ppc440spe_adma_prep_dma_xor_zero_sum
(struct dma_chan *chan , dma_addr_t *src , unsigned int src_cnt , size_t
len , enum sum_check_flags *result , unsigned long flags );

Yes she's a whole struct dma_async_tx_descriptor * return type and yes she takes six arguments, we love a main character with a big signature 👑

🦋 ARGUMENTS 🦋

Okay so not me having to tell you this, but the source literally just says -- undescribed -- for every single one. Like, the docs really said "you'll figure it out" 😭 So here's the realness, no cap, no invented lore:

  • chan — struct dma_chan *. The manual gives us zero description. -- undescribed --. Bestie the docs simply did not show up 💀
  • src — dma_addr_t *. Again: -- undescribed --. She's a mystery, iykyk 🙈
  • src_cnt — unsigned int. Also -- undescribed --. The silence is loud fr fr
  • len — size_t. -- undescribed --. A whole size and no explanation, iconic behaviour honestly
  • result — enum sum_check_flags *. -- undescribed --. The lore is missing 🫶
  • flags — unsigned long. -- undescribed --. Last one and yeah, still nothing
Lowkey important: I'm not gonna sit here and make up what these do, because the original has no descriptions for them. That's not me gatekeeping, that's just the manpage being a little empty on purpose. No invented facts on this account 🫡

🧚 SEE ALSO 🧚

The kernel file this whole thing comes from is ./drivers/dma/ppc4xx/adma.c — go read it, she ate 💅

And now the full friend group, every single one, no cuts, no skips, no "etc." (you know I don't do that):

Like, that's the whole squad and they're all tagged (9), we stan a consistent section number 🫶

Alright bestie, that's the page 🌈 This little love letter to XOR ZERO_SUM ships from ./drivers/dma/ppc4xx and is dated October 2026, and the girl herself is ppc440spe_ad...xor_zero_sum(9) — go prep that CDB group, you're gonna slay 💖🎀

📦 where this page comes from