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General informations

The Linux kernel configuration item CONFIG_HAVE_PREEMPT_DYNAMIC_KEY:

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An architecture should select this if it can handle the preemption model being selected at boot time using static keys.

Each preemption function will be given an early return based on a static key. This should have slightly lower overhead than non-inline static calls, as this effectively inlines each trampoline into the start of its callee. This may avoid redundant work, and may integrate better with CFI schemes.

This will have greater overhead than using inline static calls as the call to the preemption function cannot be entirely elided.



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