linux-kernel - Re: [PATCH 5/5] x86: EFI memory mapping changes according to changes to ioremap and c_p

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Date:	Thu, 31 Jan 2008 13:18:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, Andi Kleen <ak@...e.de>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH 5/5] x86: EFI memory mapping changes according to
	changes to ioremap and c_p_a


* Huang, Ying <ying.huang@...el.com> wrote:

> +			/* Assume pages are mapped as WB */
> +			if (mode == IOR_MODE_UNCACHED)
> +				set_memory_uc(md->virt_addr, md->num_pages);
> +			/* Assume pages are mapped as unexecutable */
> +			if ((__supported_pte_mask & _PAGE_NX) &&
> +			    xmode == IOR_XMODE_EXEC)
> +				set_memory_x(md->virt_addr, md->num_pages);

hm, why is the check for __supported_pte_mask needed? That is already 
listened to in set_memory_x(). [if not then it's an ioremap bug that we 
want to fix.]

> -static int ioremap_change_attr(unsigned long paddr, unsigned long size,
> -			       enum ioremap_mode mode,
> -			       enum ioremap_xmode xmode)
> +int ioremap_change_attr(unsigned long paddr, unsigned long size,
> +			enum ioremap_mode mode,
> +			enum ioremap_xmode xmode)

hm, there should be no need to use this raw API.

	Ingo
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