linux-kernel - [PATCH 0/2] riscv: Use CONFIG_HAVE_EFFICIENT_UNALIGNED

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Message-Id: <20240131-disable_misaligned_probe_config-v1-0-98d155e9cda8@rivosinc.com>
Date: Wed, 31 Jan 2024 22:40:21 -0800
From: Charlie Jenkins <charlie@...osinc.com>
To: Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Jisheng Zhang <jszhang@...nel.org>, Evan Green <evan@...osinc.com>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Charlie Jenkins <charlie@...osinc.com>
Subject: [PATCH 0/2] riscv: Use CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS to
 set misaligned access speed

If CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS is enabled, no time needs to
be spent in the misaligned access speed probe. Disable the probe in this
case and set respective uses to "fast" misaligned accesses. On riscv,
this config is selected if RISCV_EFFICIENT_UNALIGNED_ACCESS is selected,
which is dependent on NONPORTABLE.

Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
---
Charlie Jenkins (2):
      riscv: lib: Introduce has_fast_misaligned_access function
      riscv: Disable misaligned access probe when CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS

 arch/riscv/include/asm/cpufeature.h  | 13 +++++++++++++
 arch/riscv/kernel/cpufeature.c       |  4 ++++
 arch/riscv/kernel/sys_hwprobe.c      |  4 ++++
 arch/riscv/kernel/traps_misaligned.c |  4 ++++
 arch/riscv/lib/csum.c                |  5 +----
 5 files changed, 26 insertions(+), 4 deletions(-)
---
base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
change-id: 20240131-disable_misaligned_probe_config-043aea375f93
-- 
- Charlie