[PATCH] NOMMU: Stub out vm_get_page_prot() if there's no MMU

[David Howells]

Stub out vm_get_page_prot() if there's no MMU.

This was added by commit:

	commit 804af2cf6e7af31d2e664b54e657dddd9b531dbd
	Author: Hugh Dickins <hugh@xxxxxxxxxxx>
	Date:   Wed Jul 26 21:39:49 2006 +0100
	Subject: [AGPGART] remove private page protection map

and is used in commit:

	commit c07fbfd17e614a76b194f371c5331e21e6cffb54
	Author: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
	Date:   Tue Aug 10 18:02:45 2010 -0700
	Subject: fbmem: VM_IO set, but not propagated

in the fbmem video driver, but the function doesn't exist on NOMMU, resulting
in an undefined symbol at link time.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---

 include/linux/mm.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 831c693..e6b1210 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1363,7 +1363,15 @@ static inline unsigned long vma_pages(struct vm_area_struct *vma)
 	return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 }
 
+#ifdef CONFIG_MMU
 pgprot_t vm_get_page_prot(unsigned long vm_flags);
+#else
+static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
+{
+	return __pgprot(0);
+}
+#endif
+
 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
 			unsigned long pfn, unsigned long size, pgprot_t);

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