linux-kernel - [PATCH 2/4] NOMMU: There are no pagetables for walk_page

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Date:	Thu, 24 Sep 2009 12:33:37 +0100
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org, akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: [PATCH 2/4] NOMMU: There are no pagetables for walk_page_range() in
	NOMMU mode

walk_page_range() can't walk the page tables in NOMMU mode, so make it
unavailable in such circumstances.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 include/linux/mm.h |    3 +++
 mm/Makefile        |    4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)


diff --git a/include/linux/mm.h b/include/linux/mm.h
index 23e7fd6..17dc39f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -750,6 +750,7 @@ unsigned long unmap_vmas(struct mmu_gather **tlb,
 		unsigned long end_addr, unsigned long *nr_accounted,
 		struct zap_details *);
 
+#ifdef CONFIG_MMU
 /**
  * mm_walk - callbacks for walk_page_range
  * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
@@ -772,6 +773,8 @@ struct mm_walk {
 
 int walk_page_range(unsigned long addr, unsigned long end,
 		struct mm_walk *walk);
+#endif
+
 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
 		unsigned long end, unsigned long floor, unsigned long ceiling);
 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
diff --git a/mm/Makefile b/mm/Makefile
index 88193d7..5ac31a1 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -5,14 +5,14 @@
 mmu-y			:= nommu.o
 mmu-$(CONFIG_MMU)	:= fremap.o highmem.o madvise.o memory.o mincore.o \
 			   mlock.o mmap.o mprotect.o mremap.o msync.o rmap.o \
-			   vmalloc.o
+			   vmalloc.o pagewalk.o
 
 obj-y			:= bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
 			   maccess.o page_alloc.o page-writeback.o \
 			   readahead.o swap.o truncate.o vmscan.o shmem.o \
 			   prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \
 			   page_isolation.o mm_init.o mmu_context.o \
-			   pagewalk.o $(mmu-y)
+			   $(mmu-y)
 obj-y += init-mm.o
 
 obj-$(CONFIG_BOUNCE)	+= bounce.o

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