linux-kernel - [PATCH] NOMMU: Stub out vm_get_page

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Message-ID: <20100826150034.22254.54402.stgit@warthog.procyon.org.uk>
Date:	Thu, 26 Aug 2010 16:00:34 +0100
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org, akpm@...ux-foundation.org
Cc:	vapier.adi@...il.com, konrad.wilk@...cle.com,
	gavinl@...pacsort.com, uclinux-dev@...inux.org,
	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: [PATCH] NOMMU: Stub out vm_get_page_prot() if there's no MMU

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

This was added by commit:

	commit 804af2cf6e7af31d2e664b54e657dddd9b531dbd
	Author: Hugh Dickins <hugh@...itas.com>
	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@...ho.nsa.gov>
	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@...hat.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---

 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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