diff options
Diffstat (limited to 'arch/arm64/kernel/fpsimd.c')
| -rw-r--r-- | arch/arm64/kernel/fpsimd.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index 000b5f9215c6..c7531b85b303 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -111,6 +111,9 @@ */ static DEFINE_PER_CPU(struct fpsimd_state *, fpsimd_last_state); +/* Default VL for tasks that don't set it explicitly: */ +static int sve_default_vl = SVE_VL_MIN; + /* * Call __sve_free() directly only if you know task can't be scheduled * or preempted. @@ -474,15 +477,20 @@ void fpsimd_flush_thread(void) * If a bug causes this to go wrong, we make some noise and * try to fudge thread.sve_vl to a safe value here. */ - vl = current->thread.sve_vl; - - if (vl == 0) - vl = SVE_VL_MIN; + vl = current->thread.sve_vl_onexec ? + current->thread.sve_vl_onexec : sve_default_vl; if (WARN_ON(!sve_vl_valid(vl))) vl = SVE_VL_MIN; current->thread.sve_vl = vl; + + /* + * If the task is not set to inherit, ensure that the vector + * length will be reset by a subsequent exec: + */ + if (!test_thread_flag(TIF_SVE_VL_INHERIT)) + current->thread.sve_vl_onexec = 0; } set_thread_flag(TIF_FOREIGN_FPSTATE); |