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authorOleg Nesterov <oleg@redhat.com>2009-07-10 03:27:38 +0200
committerJames Morris <jmorris@namei.org>2009-08-10 20:48:32 +1000
commit00f89d218523b9bf6b522349c039d5ac80aa536d (patch)
treecde7a8bde2798e4fb3ae28756f6cedd4db9191cc /fs/proc/task_nommu.c
parent13f0feafa6b8aead57a2a328e2fca6a5828bf286 (diff)
mm_for_maps: shift down_read(mmap_sem) to the caller
mm_for_maps() takes ->mmap_sem after security checks, this looks strange and obfuscates the locking rules. Move this lock to its single caller, m_start(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'fs/proc/task_nommu.c')
-rw-r--r--fs/proc/task_nommu.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index 64a72e2e7650..8f5c05d3dbd3 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -189,6 +189,7 @@ static void *m_start(struct seq_file *m, loff_t *pos)
priv->task = NULL;
return NULL;
}
+ down_read(&mm->mmap_sem);
/* start from the Nth VMA */
for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))