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

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Date:	Thu, 31 Jan 2008 17:30:27 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andi Kleen <ak@...e.de>
cc:	huang ying <huang.ying.caritas@...il.com>,
	"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

On Thu, 31 Jan 2008, Andi Kleen wrote:
> > 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.

Thanks for pointing this out.

       tglx
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