bpf: arena: use kmalloc_nolock() in place of kvcalloc()

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To make arena_alloc_pages() safe to be called from any context, replace
kvcalloc() with kmalloc_nolock() so as it doesn't sleep or take any
locks. kmalloc_nolock() returns NULL for allocations larger than
KMALLOC_MAX_CACHE_SIZE, which is (PAGE_SIZE * 2) = 8KB on systems with
4KB pages. So, round down the allocation done by kmalloc_nolock to 1024
* 8 and reuse the array in a loop.

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20251222195022.431211-3-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Puranjay Mohan 2025-12-22 11:50:17 -08:00 • committed by Alexei Starovoitov

parent c336b0b327

commit 360c35f8ff

1 changed files with 55 additions and 29 deletions

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kernel/bpf/arena.c

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