> nope, should work by default. Do you have NEON related crypto code or > EFI enabled? Sebastian, Thank you for the comments. I have NEON related crypto code enabled right now, but I remember disabling it and it did not make a difference. I will disable it again and will give it a try. In the mean time, when I disabled the following 4 lines from the config file and re-compiled the kernel, the test code works fine without the issue described earlier related to floating point. Are you suspecting that NEON related crypto interferes with real time kernel and not with non-rt kernel? # CONFIG_PREEMPT_RT_BASE=y # CONFIG_HAVE_PREEMPT_LAZY=y # CONFIG_PREEMPT_LAZY=y # CONFIG_PREEMPT_RT_FULL=y > Could you please try the latest v4.18? I believe it is fixed there and > needs just backporting. Could you please try? I will try it as a last resort because I am not sure if the board BSP supports v4.18. Right now, I am trying to figure out, why it works fine with non-rt kernel and only see the issue when the above four RT_PREEMPT config options are turned on. On Fri, Oct 5, 2018, 9:55 AM Sebastian Andrzej Siewior <sebastian.siewior@xxxxxxxxxxxxx> wrote: > > On 2018-10-04 19:12:53 [-0700], Anup Pemmaiah wrote: > > 1) Is there any floating point related kernel setting that I should > > set in the RT_PREEMPT kernel? I have set eagerfpu=on (even though it > > is on by default) > > nope, should work by default. Do you have NEON related crypto code or > EFI enabled? > > > 2) Was reading about "Lazy Stacking" for Cortex-M4, but not sure if it > > applies for Cortex A57 > > > > Any comments will be greatly appreciated. > > Could you please try the latest v4.18? I believe it is fixed there and > needs just backporting. Could you please try? > > > Sebastian On Fri, Oct 5, 2018 at 9:55 AM Sebastian Andrzej Siewior <sebastian.siewior@xxxxxxxxxxxxx> wrote: > > On 2018-10-04 19:12:53 [-0700], Anup Pemmaiah wrote: > > 1) Is there any floating point related kernel setting that I should > > set in the RT_PREEMPT kernel? I have set eagerfpu=on (even though it > > is on by default) > > nope, should work by default. Do you have NEON related crypto code or > EFI enabled? > > > 2) Was reading about "Lazy Stacking" for Cortex-M4, but not sure if it > > applies for Cortex A57 > > > > Any comments will be greatly appreciated. > > Could you please try the latest v4.18? I believe it is fixed there and > needs just backporting. Could you please try? > > Sebastian
