Hello, On Tue, Dec 12, 2023 at 10:34:55PM +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. > Note that most architectures do not include asm-generic/cacheflush.h so to > avoid build failures, this patch implements the new function on each of > those architectures. For all architectures except riscv, this new function > is implemented as a no-op to keep the existing behaviour but it likely > needs another implementation. > > patch 2 simply enables the page percpu first chunk allocator in riscv. > > Changes in v2: > - Rebase on top of 6.7 > - Define flush_cache_vmap_early() for all architectures that do > not include <asm-generic/cacheflush.h> to avoid build failures > > Alexandre Ghiti (2): > mm: Introduce flush_cache_vmap_early() > riscv: Enable pcpu page first chunk allocator > > arch/arc/include/asm/cacheflush.h | 1 + > arch/arm/include/asm/cacheflush.h | 2 ++ > arch/csky/abiv1/inc/abi/cacheflush.h | 1 + > arch/csky/abiv2/inc/abi/cacheflush.h | 1 + > arch/m68k/include/asm/cacheflush_mm.h | 1 + > arch/mips/include/asm/cacheflush.h | 2 ++ > arch/nios2/include/asm/cacheflush.h | 1 + > arch/parisc/include/asm/cacheflush.h | 1 + > arch/riscv/Kconfig | 2 ++ > arch/riscv/include/asm/cacheflush.h | 3 ++- > arch/riscv/include/asm/tlbflush.h | 1 + > arch/riscv/mm/kasan_init.c | 8 ++++++++ > arch/riscv/mm/tlbflush.c | 5 +++++ > arch/sh/include/asm/cacheflush.h | 1 + > arch/sparc/include/asm/cacheflush_32.h | 1 + > arch/sparc/include/asm/cacheflush_64.h | 1 + > arch/xtensa/include/asm/cacheflush.h | 6 ++++-- > include/asm-generic/cacheflush.h | 6 ++++++ > mm/percpu.c | 8 +------- > 19 files changed, 42 insertions(+), 10 deletions(-) > > -- > 2.39.2 > Thanks for the quick v2. Applied to percpu#for-6.8. Thanks, Dennis
