6.13-stable review patch. If anyone has any objections, please let me know.
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From: Andrew Jones ajones@ventanamicro.com
[ Upstream commit 5af72a818612332a11171b16f27a62ec0a0f91d7 ]
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 Link: https://lore.kernel.org/r/20250304120014.143628-12-ajones@ventanamicro.com Signed-off-by: Alexandre Ghiti alexghiti@rivosinc.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/riscv/kernel/unaligned_access_speed.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/riscv/kernel/unaligned_access_speed.c b/arch/riscv/kernel/unaligned_access_speed.c index 85c868a8cee63..2e41b42498c76 100644 --- a/arch/riscv/kernel/unaligned_access_speed.c +++ b/arch/riscv/kernel/unaligned_access_speed.c @@ -370,10 +370,12 @@ 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);