Hi, Le 2023-10-10 13:54, Diederik de Haas a écrit : > On Tuesday, 10 October 2023 12:10:07 CEST Emanuele Rocca wrote: > > CONFIG_PREEMPT_DYNAMIC is set to 'y' by default on amd64 due to > > HAVE_PREEMPT_DYNAMIC_CALL being 'y', see: > > https://sources.debian.org/src/linux/6.5.6-1/kernel/Kconfig.preempt/?hl=101# > > L101 > > > > arm64 does not have PREEMPT_DYNAMIC_CALL, this is why PREEMPT_DYNAMIC is > > not set by default there. > > Neither does amd64. So it appears something else is causing > CONFIG_PREEMPT_DYNAMIC to be enabled on amd64.
From the commit message introducing PREEMPT_DYNAMIC:¹
CONFIG_PREEMPT_DYNAMIC is automatically selected by CONFIG_PREEMPT if
the architecture provides the necessary support (CONFIG_STATIC_CALL_INLINE,
CONFIG_GENERIC_ENTRY, and provide with __preempt_schedule_function() /
__preempt_schedule_notrace_function()).
Cheers,
Vincent
¹ https://lore.kernel.org/all/[email protected]/T/#u
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