linux-kernel - [PATCH 13/16] x86: make /dev/mem mappings _PAGE

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Message-Id: <1242163718-2934-14-git-send-email-jeremy@goop.org>
Date:	Tue, 12 May 2009 14:28:35 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 13/16] x86: make /dev/mem mappings _PAGE_IOMAP

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

Use _PAGE_IOMAP on /dev/mem mappings.

[ Impact: allow hardware to be mapped via /dev/mem in Xen ]

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/mm/pat.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 5ba8d88..3f7886f 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -494,7 +494,7 @@ int free_memtype(u64 start, u64 end)
 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 				unsigned long size, pgprot_t vma_prot)
 {
-	return vma_prot;
+	return __pgprot(pgprot_val(vma_prot) | _PAGE_IOMAP);
 }
 
 #ifdef CONFIG_STRICT_DEVMEM
-- 
1.6.0.6

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