Hello,
On Fri, Nov 10, 2023 at 03:07:19PM +0100, 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(-)
>
> --
> 2.39.2
>
I've applied this to percpu#for-6.8.
Thanks,
Dennis