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

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Message-Id: <200801311427.38198.ak@suse.de>
Date:	Thu, 31 Jan 2008 14:27:38 +0100
From:	Andi Kleen <ak@...e.de>
To:	"huang ying" <huang.ying.caritas@...il.com>
Cc:	"Thomas Gleixner" <tglx@...utronix.de>,
	"Huang, Ying" <ying.huang@...el.com>,
	"Ingo Molnar" <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] x86: add executable mapping support to ioremap


> addr = ioremap(phys_addr, len);
> set_memory_x(addr);
> if (phys_addr < (end_pfn_mapped >> PAGE_SHIFT))
>         set_memory_x(__va(phys_addr));

If you just need the ioremap executable there is no reason to split 
up the direct mapping for this too. The x86 architecture does not require
x bits to be coherent between mappings; only the caching attributes.

-Andi

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