Messages in this thread | | | From | Charlie Jenkins <> | Subject | [PATCH v5 0/2] riscv: Use Kconfig to set unaligned access speed | Date | Tue, 27 Feb 2024 15:13:12 -0800 |
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If the hardware unaligned access speed is known at compile time, it is possible to avoid running the unaligned access speed probe to speedup boot-time.
Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> --- Changes in v5: - Clarify Kconfig options from Conor's feedback - Use "unaligned" instead of "misaligned" in introduced file/function. This is a bit hard to standardize because the riscv manual says "misaligned" but the existing Linux configs say "unaligned". - Link to v4: https://lore.kernel.org/r/20240216-disable_misaligned_probe_config-v4-0-dc01e581c0ac@rivosinc.com
Changes in v4: - Add additional Kconfig options for the other unaligned access speeds - Link to v3: https://lore.kernel.org/r/20240202-disable_misaligned_probe_config-v3-0-c44f91f03bb6@rivosinc.com
Changes in v3: - Revert change to csum (Eric) - Change ifndefs for ifdefs (Eric) - Change config in Makefile (Elliot/Eric) - Link to v2: https://lore.kernel.org/r/20240201-disable_misaligned_probe_config-v2-0-77c368bed7b2@rivosinc.com
Changes in v2: - Move around definitions to reduce ifdefs (Clément) - Make RISCV_MISALIGNED depend on !HAVE_EFFICIENT_UNALIGNED_ACCESS (Clément) - Link to v1: https://lore.kernel.org/r/20240131-disable_misaligned_probe_config-v1-0-98d155e9cda8@rivosinc.com
--- Charlie Jenkins (2): riscv: lib: Introduce has_fast_unaligned_access function riscv: Set unaligned access speed at compile time
arch/riscv/Kconfig | 47 +++++- arch/riscv/include/asm/cpufeature.h | 43 ++++- arch/riscv/kernel/Makefile | 6 +- arch/riscv/kernel/cpufeature.c | 255 ------------------------------ arch/riscv/kernel/probe_emulated_access.c | 64 ++++++++ arch/riscv/kernel/sys_hwprobe.c | 23 +++ arch/riscv/kernel/traps_misaligned.c | 54 +------ arch/riscv/lib/csum.c | 7 +- 8 files changed, 173 insertions(+), 326 deletions(-) --- base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d change-id: 20240131-disable_misaligned_probe_config-043aea375f93 -- - Charlie
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