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
