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Subject[PATCH 2/4] NOMMU: There are no pagetables for walk_page_range() in NOMMU mode
Date
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@redhat.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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