linux-kernel - Re: [PATCH v3 2/7] x86/jump_label: Use text_poke_early() during early

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Date:   Mon, 5 Nov 2018 14:33:47 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nadav Amit <namit@...are.com>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v3 2/7] x86/jump_label: Use text_poke_early() during
 early_init

On Mon, Nov 05, 2018 at 01:39:53PM +0100, Peter Zijlstra wrote:
> On Fri, Nov 02, 2018 at 04:29:41PM -0700, Nadav Amit wrote:
> > diff --git a/init/main.c b/init/main.c
> > index a664246450d1..b0fa26637496 100644
> > --- a/init/main.c
> > +++ b/init/main.c
> > @@ -117,6 +117,8 @@ extern void radix_tree_init(void);
> >   */
> >  bool early_boot_irqs_disabled __read_mostly;
> >  
> > +u8 early_boot_done __read_mostly;
> > +
> >  enum system_states system_state __read_mostly;
> >  EXPORT_SYMBOL(system_state);
> 
> Should this not be using system_state ^ ? The site is very close to
> SYSTEM_SCHEDULING, can we use that or should we add another state ?

We must be before kernel_init() -> kernel_init_freeable() -> smp_init().

So we need another state, something like SYSTEM_BOOTING_SMP I suppose ?

> > @@ -735,6 +737,8 @@ asmlinkage __visible void __init start_kernel(void)
> >  		efi_free_boot_services();
> >  	}
> >  
> > +	early_boot_done = true;
> > +
> >  	/* Do the rest non-__init'ed, we're now alive */
> >  	rest_init();
> >  }
> > -- 
> > 2.17.1
> >