On Wed, Dec 06, 2023 at 11:08:20AM +0100, Alexandre Ghiti wrote: > 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? On cursory look, it looked fine to me but Dennis is maintaining the percpu tree now. Dennis? Thanks. -- tejun
