procfs: disable per-task stack usage on NOMMU

It needs walk_page_range().

Reported-by: Michal Simek <monstr@monstr.eu>
Tested-by: Michal Simek <monstr@monstr.eu>
Cc: Stefani Seibold <stefani@seibold.net>
Cc: David Howells <dhowells@redhat.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 9 insertions, 2 deletions

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 0c6bc602e6c4..07f77a7945c3 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -322,6 +322,8 @@ static inline void task_context_switch_counts(struct seq_file *m,
                         p->nivcsw);
 }
 
+#ifdef CONFIG_MMU
+
 struct stack_stats {
         struct vm_area_struct *vma;
         unsigned long   startpage;
@@ -402,6 +404,11 @@ static inline void task_show_stack_usage(struct seq_file *m,
                 mmput(mm);
         }
 }
+#else
+static void task_show_stack_usage(struct seq_file *m, struct task_struct *task)
+{
+}
+#endif          /* CONFIG_MMU */
 
 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
                         struct pid *pid, struct task_struct *task)
diff --git a/mm/Makefile b/mm/Makefile
index 515fd793c17f..ebf849042ed3 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