Messages in this thread |  | | From | Yunhui Cui <> | | Subject | [PATCH v4 0/3] riscv: improve percpu helpers and PIO mapping | | Date | Tue, 5 May 2026 14:20:23 +0800 |
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This series makes three small RISC-V cleanups and fixes around percpu access and PIO helper handling.
This work is motivated in part by build reports from lkp and by follow-up review/discussion around the percpu access rework:
https://lore.kernel.org/all/202512202218.FI6bB5kV-lkp@intel.com/ https://lore.kernel.org/all/202512210052.w0bpUAAO-lkp@intel.com/
1. Avoid forming invalid PIO address expressions when I/O port support is not enabled, while keeping the generic pci_iounmap() behavior intact.
2. Introduce arch/riscv/include/asm/percpu.h with RISC-V-specific percpu helpers, including the fix for the 8/16-bit add_return LR/SC fallback.
3. Cache the percpu offset in thread_info so percpu accesses can use it directly across the relevant RISC-V paths.
Yunhui Cui (3): riscv: io: avoid null-pointer arithmetic in PIO helpers riscv: introduce percpu.h into include/asm riscv: store percpu offset into thread_info
arch/riscv/include/asm/asm.h | 6 +- arch/riscv/include/asm/io.h | 26 ++- arch/riscv/include/asm/percpu.h | 284 +++++++++++++++++++++++++++ arch/riscv/include/asm/switch_to.h | 8 + arch/riscv/include/asm/thread_info.h | 3 +- arch/riscv/kernel/asm-offsets.c | 1 + arch/riscv/kernel/smpboot.c | 7 + arch/riscv/net/bpf_jit_comp64.c | 9 +- include/asm-generic/io.h | 4 + 9 files changed, 326 insertions(+), 22 deletions(-) create mode 100644 arch/riscv/include/asm/percpu.h
-- 2.39.5
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