linux-kernel - Re: [PATCH RFC V4 10/10] jump-label: initialize jump-label subsystem much earlier

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Date:	Thu, 13 Oct 2011 12:43:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	"David S. Miller" <davem@...emloft.net>,
	David Daney <david.daney@...ium.com>,
	Michael Ellerman <michael@...erman.id.au>,
	Jan Glauber <jang@...ux.vnet.ibm.com>,
	Jason Baron <jbaron@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH RFC V4 10/10] jump-label: initialize jump-label
 subsystem much earlier

On Wed, 2011-10-12 at 17:08 -0700, Jeremy Fitzhardinge wrote:
> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> 
> Initialize jump_labels much earlier, we can use them.

We can use them, where? how? what?, that sentence just begs for more.

> diff --git a/init/main.c b/init/main.c
> index 2a9b88a..f4094ed 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -637,6 +637,7 @@ asmlinkage void __init start_kernel(void)
>  	acpi_early_init(); /* before LAPIC and SMP init */
>  	sfi_init_late();
>  
> +	jump_label_init();
>  	ftrace_init();
>  
>  	/* Do the rest non-__init'ed, we're now alive */

Can we push them much earlier still? If possible I'd like them to be
before sched_init() so that I might use them there, if not possible, at
the very least before enabling interrupts would be nice.


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