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

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Date:   Fri, 10 Nov 2023 15:07:19 +0100
From:   Alexandre Ghiti <alexghiti@...osinc.com>
To:     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
Cc:     Alexandre Ghiti <alexghiti@...osinc.com>
Subject: [PATCH 0/2] riscv: Enable percpu page first chunk allocator

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