Am 02.11.23 um 12:19 schrieb Lucas Stach:
Am Donnerstag, dem 02.11.2023 um 11:48 +0100 schrieb Christian König:
[...]
I was considering to change the dma_fence semantics so that
dma_fence_signal() could only be called from the interrupt contexts of
devices and then put a big fat WARN_ON(!in_interrupt()) in there.
It's a sledgehammer, but as far as I can see the only thing which might
help. Opinions?
That's not going to fly. As soon as you are dealing with device drivers
that use IRQ threads, either voluntarily or even involuntarily on RT
kernels, the dma_fence_signal will be from process context.
Ah shit, yeah of course. We use IRQ threads in amdgpu for the second
interrupt ring as well.
Ok, nail that coffin. Any other ideas how we could enforce this?
Thanks,
Christian.
Regards,
Lucas
