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[v10,2/6] RISC-V: Scalar unaligned access emulated on hotplug CPUs

Message ID 20241017-jesse_unaligned_vector-v10-2-5b33500160f8@rivosinc.com (mailing list archive)
State New
Headers show
Series RISC-V: Detect and report speed of unaligned vector accesses | expand

Commit Message

Charlie Jenkins Oct. 17, 2024, 7 p.m. UTC 
From: Jesse Taube <jesse@rivosinc.com>

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
---
 arch/riscv/kernel/unaligned_access_speed.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/riscv/kernel/unaligned_access_speed.c b/arch/riscv/kernel/unaligned_access_speed.c
index 160628a2116d..f3508cc54f91 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");