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

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Date:   Wed, 6 Dec 2023 11:08:20 +0100
From:   Alexandre Ghiti <alex@...ti.fr>
To:     Alexandre Ghiti <alexghiti@...osinc.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Arnd Bergmann <arnd@...db.de>, Dennis Zhou <dennis@...nel.org>,
        Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-arch@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 0/2] riscv: Enable percpu page first chunk allocator

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