6.11-stable review patch. If anyone has any objections, please let me know.
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From: Jesse Taube jesse@rivosinc.com
commit 9c528b5f7927b857b40f3c46afbc869827af3c94 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: 55e0bf49a0d0 ("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... Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/riscv/kernel/unaligned_access_speed.c | 1 + 1 file changed, 1 insertion(+)
--- 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 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");