From: Jesse Taube Date: Thu, 17 Oct 2024 19:00:19 +0000 (-0700) Subject: RISC-V: Scalar unaligned access emulated on hotplug CPUs X-Git-Tag: v6.13-rc1~56^2~5^2~4 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9c528b5f7927b857b40f3c46afbc869827af3c94;p=thirdparty%2Flinux.git RISC-V: Scalar unaligned access emulated on hotplug CPUs The check_unaligned_access_emulated() function should have been called during CPU hotplug to ensure that if all CPUs had emulated unaligned accesses, the new CPU also does. This patch adds the call to check_unaligned_access_emulated() in the hotplug path. Fixes: 55e0bf49a0d0 ("RISC-V: Probe misaligned access speed in parallel") Signed-off-by: Jesse Taube Reviewed-by: Evan Green Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20241017-jesse_unaligned_vector-v10-2-5b33500160f8@rivosinc.com Signed-off-by: Palmer Dabbelt --- diff --git a/arch/riscv/kernel/unaligned_access_speed.c b/arch/riscv/kernel/unaligned_access_speed.c index 160628a2116de..f3508cc54f91a 100644 --- a/arch/riscv/kernel/unaligned_access_speed.c +++ b/arch/riscv/kernel/unaligned_access_speed.c @@ -191,6 +191,7 @@ static int riscv_online_cpu(unsigned int cpu) if (per_cpu(misaligned_access_speed, cpu) != RISCV_HWPROBE_MISALIGNED_SCALAR_UNKNOWN) goto exit; + check_unaligned_access_emulated(NULL); buf = alloc_pages(GFP_KERNEL, MISALIGNED_BUFFER_ORDER); if (!buf) { pr_warn("Allocation failure, not measuring misaligned performance\n");