riscv: Enable pcpu page first chunk allocator

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As explained in commit 6ea529a203 ("percpu: make embedding first chunk
allocator check vmalloc space size"), the embedding first chunk allocator
needs the vmalloc space to be larger than the maximum distance between
units which are grouped into NUMA nodes.

On a very sparse NUMA configurations and a small vmalloc area (for example,
it is 64GB in sv39), the allocation of dynamic percpu data in the vmalloc
area could fail.

So provide the pcpu page allocator as a fallback in case we fall into
such a sparse configuration (which happened in arm64 as shown by
commit 09cea61950 ("arm64: support page mapping percpu first chunk
allocator")).

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>

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This commit is contained in:

Alexandre Ghiti 2023-12-12 22:34:57 +01:00 • committed by Dennis Zhou

parent 7a92fc8b4d

commit 6b9f29b81b

2 changed files with 10 additions and 0 deletions

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2

arch/riscv/Kconfig

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8

arch/riscv/mm/kasan_init.c

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