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| author | Alexandre Ghiti <alexghiti@rivosinc.com> | 2023-12-12 22:34:57 +0100 |
|---|---|---|
| committer | Dennis Zhou <dennis@kernel.org> | 2023-12-14 00:24:06 -0800 |
| commit | 6b9f29b81b155af023da95f560f738f29722b306 (patch) | |
| tree | fa31f30d1576fb32ca2c77d3f818688ea1a317fe /arch/riscv/Kconfig | |
| parent | 7a92fc8b4d20680e4c20289a670d8fca2d1f2c1b (diff) | |
riscv: Enable pcpu page first chunk allocator
As explained in commit 6ea529a2037c ("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 09cea6195073 ("arm64: support page mapping percpu first chunk
allocator")).
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 95a2a06acc6a..80e9b2ac34ab 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -414,7 +414,9 @@ config NUMA depends on SMP && MMU select ARCH_SUPPORTS_NUMA_BALANCING select GENERIC_ARCH_NUMA + select HAVE_SETUP_PER_CPU_AREA select NEED_PER_CPU_EMBED_FIRST_CHUNK + select NEED_PER_CPU_PAGE_FIRST_CHUNK select OF_NUMA select USE_PERCPU_NUMA_NODE_ID help |