linux-kernel - Re: [PATCH] ignore ,keep for efi earlyprintk

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Date:	Wed, 30 Apr 2014 09:12:50 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Matt Fleming <matt@...sole-pimps.org>, matt.fleming@...el.com,
	hpa@...or.com, akpm@...ux-foundation.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org
Subject: Re: [PATCH] ignore ,keep for efi earlyprintk

On 04/29/14 at 12:21pm, Thomas Gleixner wrote:
> On Tue, 29 Apr 2014, Matt Fleming wrote:
> > I would just replace the existing calls to early_ioremap() with
> > efi_ioremap() and implement it like so (all in
> > arch/x86/platform/efi/early_printk.c),
> > 
> > static void *efi_ioremap(resource_size_t phys_addr, unsigned long size)
> > {
> > 	if (system_state == SYSTEM_BOOTING)
> > 		return early_ioremap(phys_addr, size);
> > 
> > 	return ioremap(phys_addr, size);
> > }
> > 
> > At least I think SYSTEM_BOOTING is the correct way to figure out when to
> > use early_ioremap(), I'm open to other suggestions though.
> 
> ioremap() is available after paging_init() has been called.
> 
> Just x86 has this extra bits so you can use early_ioremap/unmap
> _AFTER_ paging_init(). No idea why, but probably to cope with some
> brilliant init calls which run pre and post paging_init().

Good idea, will use an initcall function for this purpose.
Thanks a lot.
Dave
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