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[v2,2/8] riscv: Fix riscv_online_cpu_vec

Message ID 20250221145718.115076-12-ajones@ventanamicro.com (mailing list archive)
State New
Headers show
Series riscv: Unaligned access speed probing fixes and skipping | expand

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Commit Message

Andrew Jones Feb. 21, 2025, 2:57 p.m. UTC 
We shouldn't probe when we already know vector is unsupported and
we should probe when we see we don't yet know whether it's supported.
Furthermore, we should ensure we've set the access type to
unsupported when we don't have vector at all.

Fixes: e7c9d66e313b ("RISC-V: Report vector unaligned access speed hwprobe")
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
---
 arch/riscv/kernel/unaligned_access_speed.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/riscv/kernel/unaligned_access_speed.c b/arch/riscv/kernel/unaligned_access_speed.c
index b7a8ff7ba6df..161964cf2abc 100644
--- a/arch/riscv/kernel/unaligned_access_speed.c
+++ b/arch/riscv/kernel/unaligned_access_speed.c
@@ -367,10 +367,12 @@  static void check_vector_unaligned_access(struct work_struct *work __always_unus
 
 static int riscv_online_cpu_vec(unsigned int cpu)
 {
-	if (!has_vector())
+	if (!has_vector()) {
+		per_cpu(vector_misaligned_access, cpu) = RISCV_HWPROBE_MISALIGNED_VECTOR_UNSUPPORTED;
 		return 0;
+	}
 
-	if (per_cpu(vector_misaligned_access, cpu) != RISCV_HWPROBE_MISALIGNED_VECTOR_UNSUPPORTED)
+	if (per_cpu(vector_misaligned_access, cpu) != RISCV_HWPROBE_MISALIGNED_VECTOR_UNKNOWN)
 		return 0;
 
 	check_vector_unaligned_access_emulated(NULL);