gen_pool_dma_zalloc_algo(9)

✨ gen_pool_dma_zalloc_algo(9) ✨

okay so bestie, welcome to the Kernel API Manual 💅 this one's a kernel function, and it's lowkey the moment you need memory that's zeroed AND set up for DMA AND allocated with your own algorithm. it's giving very specific, very powerful ✨

---

🌸 SYNOPSIS 🌸

void * gen_pool_dma_zalloc_algo (struct gen_pool *pool , size_t size ,
dma_addr_t *dma , genpool_algo_t algo , void *data );

---

🎀 ARGUMENTS 🎀

• pool — the pool you're allocating from 🫶
• size — how many bytes you wanna pull out of the pool, fr fr
• dma — your DMA-view physical address return value 💖 use NULL if you don't need it, no pressure
• algo — the algorithm, passed in from the caller ✨
• data — the data, passed straight to the algorithm 🦋

---

💜 DESCRIPTION 💜

so basically: it allocates the number of zeroed bytes you asked for, from the pool you specified, using the pool allocation function you handed it. iconic behavior honestly 👑

⚠️ heads up bestie — this can not be used in an NMI handler on architectures without an NMI-safe cmpxchg implementation. like, that's a hard no, no cap 💀

---

🔥 RETURN 🔥

it gives you back the virtual address of that zeroed memory you just got 🎀 — or NULL if it failed 😭

---

🌈 SEE ALSO 🌈

kernel file ./lib/genalloc.c, plus the whole squad:

gen_pool_create(9), gen_pool_add_owner(9), gen_pool_virt_to_phys(9), gen_pool_destroy(9), gen_pool_alloc_algo_owner(9), gen_pool_dma_alloc(9), gen_pool_dma_alloc_algo(9), gen_pool_dma_alloc_align(9), gen_pool_dma_zalloc(9), gen_pool_dma_zalloc_align(9), gen_pool_free_owner(9), gen_pool_for_each_chunk(9), gen_pool_has_addr(9), gen_pool_avail(9), gen_pool_size(9), gen_pool_set_algo(9), gen_pool_first_fit(9), gen_pool_first_fit_align(9), gen_pool_fixed_alloc(9), gen_pool_first_fit_order_align(9), gen_pool_best_fit(9), gen_pool_get(9), devm_gen_pool_create(9), of_gen_pool_get(9)

---

and that's the whole page bestie, go forth and allocate responsibly 🧚💖

💌 cute little sign-off: this one lives in ./lib, dated October 2026, and it's gen_pool_dma_zalloc_algo(9) — stan 💅