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RISC-V: Scalar unaligned access emulated on hotplug CPUs

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commit 9c528b5f79 upstream.

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: 55e0bf49a0 ("RISC-V: Probe misaligned access speed in parallel")
Signed-off-by: Jesse Taube <jesse@rivosinc.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
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 <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jesse Taube
2024-10-17 12:00:19 -07:00
committed by Greg Kroah-Hartman
parent 3017be7b84
commit 2bb3830152
1 changed files with 1 additions and 0 deletions
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arch/riscv/kernel/unaligned_access_speed.c
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@@ -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");