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 e6d0adf2eb5bb3244cb21a7a15899aa058bd384f ]
check_vector_unaligned_access_emulated_all_cpus(), like its name suggests, will return true when all cpus emulate unaligned vector accesses. If the function returned false it may have been because vector isn't supported at all (!has_vector()) or because at least one cpu doesn't emulate unaligned vector accesses. Since false may be returned for two cases, checking for it isn't sufficient when attempting to determine if we should proceed with the vector speed check. Move the !has_vector() functionality to check_unaligned_access_all_cpus() in order for check_vector_unaligned_access_emulated_all_cpus() to return false for a single case.
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/20250304120014.143628-13-ajones@ventanamicro.com Signed-off-by: Alexandre Ghiti alexghiti@rivosinc.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/riscv/kernel/traps_misaligned.c | 6 ------ arch/riscv/kernel/unaligned_access_speed.c | 11 +++++++---- 2 files changed, 7 insertions(+), 10 deletions(-)
diff --git a/arch/riscv/kernel/traps_misaligned.c b/arch/riscv/kernel/traps_misaligned.c index aacbd9d7196e7..4354c87c0376f 100644 --- a/arch/riscv/kernel/traps_misaligned.c +++ b/arch/riscv/kernel/traps_misaligned.c @@ -609,12 +609,6 @@ bool __init check_vector_unaligned_access_emulated_all_cpus(void) { int cpu;
- if (!has_vector()) { - for_each_online_cpu(cpu) - per_cpu(vector_misaligned_access, cpu) = RISCV_HWPROBE_MISALIGNED_VECTOR_UNSUPPORTED; - return false; - } - schedule_on_each_cpu(check_vector_unaligned_access_emulated);
for_each_online_cpu(cpu) diff --git a/arch/riscv/kernel/unaligned_access_speed.c b/arch/riscv/kernel/unaligned_access_speed.c index 2e41b42498c76..78ab4cb2ab050 100644 --- a/arch/riscv/kernel/unaligned_access_speed.c +++ b/arch/riscv/kernel/unaligned_access_speed.c @@ -406,13 +406,16 @@ static int __init vec_check_unaligned_access_speed_all_cpus(void *unused __alway
static int __init check_unaligned_access_all_cpus(void) { - bool all_cpus_emulated, all_cpus_vec_unsupported; + bool all_cpus_emulated; + int cpu;
all_cpus_emulated = check_unaligned_access_emulated_all_cpus(); - all_cpus_vec_unsupported = check_vector_unaligned_access_emulated_all_cpus();
- if (!all_cpus_vec_unsupported && - IS_ENABLED(CONFIG_RISCV_PROBE_VECTOR_UNALIGNED_ACCESS)) { + if (!has_vector()) { + for_each_online_cpu(cpu) + per_cpu(vector_misaligned_access, cpu) = RISCV_HWPROBE_MISALIGNED_VECTOR_UNSUPPORTED; + } else if (!check_vector_unaligned_access_emulated_all_cpus() && + IS_ENABLED(CONFIG_RISCV_PROBE_VECTOR_UNALIGNED_ACCESS)) { kthread_run(vec_check_unaligned_access_speed_all_cpus, NULL, "vec_check_unaligned_access_speed_all_cpus"); }