On 8 October 2023 18:20:20 CEST Johannes Schauer Marin Rodrigues wrote: > I'm wondering whether it'd make sense for the Debian kernel to be built with > CONFIG_PREEMPT_DYNAMIC=y.
Thanks for raising this, as the current situation appears a bit 'weird'. ======= PC (amd64) ====== $ uname -a Linux bagend 6.5.0-1-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.5.3-1 (2023-09-13) x86_64 GNU/Linux $ grep PREEMPT_DYNAMIC /boot/config-6.5.0-1-amd64 CONFIG_PREEMPT_DYNAMIC=y CONFIG_HAVE_PREEMPT_DYNAMIC=y CONFIG_HAVE_PREEMPT_DYNAMIC_CALL=y ======================== ======= SBC (arm64) ====== $ uname -a Linux cs21 6.1.0-13-arm64 #1 SMP Debian 6.1.55-1 (2023-09-29) aarch64 GNU/Linux $ grep PREEMPT_DYNAMIC /boot/config-6.1.0-13-arm64 # CONFIG_PREEMPT_DYNAMIC is not set CONFIG_HAVE_PREEMPT_DYNAMIC=y CONFIG_HAVE_PREEMPT_DYNAMIC_KEY=y ========================= (grep output is the same on a 6.6 kernel I use on another arm64 SBC) In the Debian kernel it's not explicitly enabled and it's having a different effect on amd64 compared to arm64. In any case, I think it would be useful if this setting was explicitly set or unset, or the above situation been made explicit ... with a nice commit message explaining why those settings were made. Cheers, Diederik
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