Re: [PATCH 0/2] riscv: Enable percpu page first chunk allocator

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Hi Tejun,

On 10/11/2023 15:07, Alexandre Ghiti wrote:
While working with pcpu variables, I noticed that riscv did not support
first chunk allocation in the vmalloc area which may be needed as a fallback
in case of a sparse NUMA configuration.

patch 1 starts by introducing a new function flush_cache_vmap_early() which
is needed since a new vmalloc mapping is established and directly accessed:
on riscv, this would likely fail in case of a reordered access or if the
uarch caches invalid entries in TLB.

patch 2 simply enables the page percpu first chunk allocator in riscv.

Alexandre Ghiti (2):
   mm: Introduce flush_cache_vmap_early() and its riscv implementation
   riscv: Enable pcpu page first chunk allocator

  arch/riscv/Kconfig                  | 2 ++
  arch/riscv/include/asm/cacheflush.h | 3 ++-
  arch/riscv/include/asm/tlbflush.h   | 2 ++
  arch/riscv/mm/kasan_init.c          | 8 ++++++++
  arch/riscv/mm/tlbflush.c            | 5 +++++
  include/asm-generic/cacheflush.h    | 6 ++++++
  mm/percpu.c                         | 8 +-------
  7 files changed, 26 insertions(+), 8 deletions(-)


Any feedback regarding this?

Thanks,

Alex





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