From: Sebastian Andrzej Siewior Date: Thu, 21 Sep 2023 16:15:14 +0200 Subject: [PATCH 3/5] drm/amd/display: Add a warning if the FPU is used outside from task context. Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz Add a warning if the FPU is used from any context other than task context. This is only precaution since the code is not able to be used from softirq while the API allows it on x86 for instance. Link: https://lore.kernel.org/r/20230921141516.520471-4-bigeasy@linutronix.de Signed-off-by: Sebastian Andrzej Siewior --- drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c @@ -84,6 +84,7 @@ void dc_fpu_begin(const char *function_n { int depth; + WARN_ON_ONCE(!in_task()); preempt_disable(); depth = __this_cpu_inc_return(fpu_recursion_depth);