Re: [PATCH v4 16/18] static_call: Allow early init

[Josh Poimboeuf]

On Fri, May 08, 2020 at 03:31:56PM +0200, Peter Zijlstra wrote:
> New version below.
> 
> ---
> Subject: static_call: Allow early init
> From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Date: Fri, 4 Oct 17:21:10 CEST 2019
> 
> 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.
> 
> (arguably, this is much much earlier than needed for perf, but it
> might allow other uses.)
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>

Looks good, I'll try to do some more testing today-ish.

-- 
Josh