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SubjectRe: [PATCH v6 15/17] static_call: Allow early init
On Fri, Jul 10, 2020 at 09:14:26PM -0400, Steven Rostedt wrote:
> On Fri, 10 Jul 2020 15:38:46 +0200
> Peter Zijlstra <peterz@infradead.org> wrote:
>
> > In order to use static_call() to wire up x86_pmu, we need to
> > initialize earlier; copy some of the tricks from jump_label to enable
> > this.
> >
> > Primarily we overload key->next to store a sites pointer when there
> > are no modules, this avoids having to use kmalloc() to initialize the
> > sites and allows us to run much earlier.
> >
>
> I'm confused. What was the need to have key->next store site pointers
> in order to move it up earlier?

The critical part was to not need an allocation.

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