linux-kernel - Re: [PATCH 4/5] x86: add executable mapping support to ioremap

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Date:	Thu, 31 Jan 2008 14:00:34 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Huang, Ying" <ying.huang@...el.com>
cc:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] x86: add executable mapping support to ioremap

On Thu, 31 Jan 2008, Huang, Ying wrote:

> This patch makes ioremap() can be used to map pages as executable,
> this is needed by EFI support.

> +extern void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
> +			       enum ioremap_mode mode,
> +			       enum ioremap_xmode xmode);
> +

Why do you want to add a new API?

    addr = ioremap(phys_addr, len);
    set_memory_x(addr);

should do what you want already. I think Arjan was not very clear in
his reply yesterday.

We tried to avoid the intermingling of ioremap and the page attribute
settings. We just kept the cached/uncached part.

Now thinking about it further, we should probably fully decouple the
mapping and the attribute change and remove the enum argument from
__ioremap and change the implementations of ioremap_cached and
ioremap_uncached to do the attribute setting after the remap. 

That way ioremap_chached and ioremap_uncached just would become what
they should be: conveniance functions for the developers.

Thanks,
	tglx
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