rvt_dereg_mr(9)

💅 rvt_dereg_mr — the "okay bye bestie" of memory regions 🌸

So this is a page from the Kernel API Manual (section 9, kernel-api manual, obvs) and it's all about unregistering and freeing a memory region. Lowkey iconic cleanup energy ✨

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✨ NAME ✨

rvt_dereg_mr — unregister and free a memory region 🎀

Like, you're done with this MR, so you free it. That's the whole vibe. Periodt.

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✨ SYNOPSIS ✨

int rvt_dereg_mr (struct ib_mr *ibmr , struct ib_udata *udata );

It takes two things and gives you back an int. Cute, simple, no cap 💜

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🫶 ARGUMENTS 🫶

• ibmr — the memory region that's getting freed. This is the main character of the whole operation 💅
• udata — literally unused by the driver. It's just… there. Present. Supporting cast energy 🙈

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🌸 DESCRIPTION 🌸

Quick lil heads-up bestie: this is the function that gets called to free up MRs that were created by rvt_get_dma_mr or rvt_reg_user_mr. So if one of those two made it, this is who cleans it up 🧹✨

And the best part? It returns 0 on success. That's it. Zero. The good zero. 🎀

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🦋 SEE ALSO 🦋

Kernel file ./drivers/infiniband/sw/rdmavt/mr.c — plus the whole friend group, go say hi:

• rvt_driver_mr_init(9)
• rvt_mr_exit(9)
• rvt_alloc_lkey(9)
• rvt_free_lkey(9)
• rvt_get_dma_mr(9)
• rvt_reg_user_mr(9)
• rvt_dereg_clean_qp_cb(9)
• rvt_dereg_clean_qps(9)
• rvt_check_refs(9)
• rvt_mr_has_lkey(9)
• rvt_ss_has_lkey(9)
• rvt_alloc_mr(9)
• rvt_set_page(9)
• rvt_map_mr_sg(9)
• rvt_fast_reg_mr(9)
• rvt_invalidate_rkey(9)
• rvt_sge_adjacent(9)
• rvt_lkey_ok(9)
• rvt_rkey_ok(9)

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ngl the whole crew is listed, so if you're lost in the MR sauce, just start clicking through these 🕵️‍♀️

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💖 the cute sign-off 💖

Source & version: ./drivers/infiniband/sw/rdmavt — dated October 2026 🗓️✨ and it's all filed under rvt_dereg_mr(9), mwah 💋 go free those memory regions responsibly bestie 🍓🌈