Unverified Commit 9c528b5f authored by Jesse Taube's avatar Jesse Taube Committed by Palmer Dabbelt
Browse files

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: 55e0bf49 ("RISC-V: Probe misaligned access speed in parallel")
Signed-off-by: default avatarJesse Taube <jesse@rivosinc.com>
Reviewed-by: default avatarEvan 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: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 8d20a739

arch/riscv/kernel/unaligned_access_speed.c

+1 −0
Original line number Diff line number Diff line
@@ -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");