Messages in this thread | | | Date | Tue, 14 Jul 2020 15:38:06 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH v6 15/17] static_call: Allow early init |
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On Tue, 14 Jul 2020 20:31:43 +0200 Peter Zijlstra <peterz@infradead.org> wrote:
> On Tue, Jul 14, 2020 at 12:07:01PM -0400, Steven Rostedt wrote: > > Can we add a statement that says something like: "Because x86 now calls > > static_call_init() before the setup of the memory allocator, we must > > avoid using kmalloc() and friends for core kernel static calls." ? > > > > This was the missing piece for me. > > It now reads like this. > > --- > Subject: static_call: Allow early init > From: Peter Zijlstra <peterz@infradead.org> > 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, specifically before memory allocation works; 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.
All the pieces lie in place. Thanks!
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
-- Steve
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> > ---
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