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

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Message-ID: <alpine.DEB.2.02.1404291217380.6261@ionos.tec.linutronix.de>
Date:	Tue, 29 Apr 2014 12:21:15 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Matt Fleming <matt@...sole-pimps.org>
cc:	Dave Young <dyoung@...hat.com>, 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 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().

Thanks,

	tglx
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