1 files changed, 4 insertions, 4 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index af128b374143..ef3f7df50023 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -239,12 +239,12 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
                 goto out_mmput;
         }
 
-        down_read(&mm->mmap_sem);
+        spin_lock(&mm->arg_lock);
         arg_start = mm->arg_start;
         arg_end = mm->arg_end;
         env_start = mm->env_start;
         env_end = mm->env_end;
-        up_read(&mm->mmap_sem);
+        spin_unlock(&mm->arg_lock);
 
         BUG_ON(arg_start > arg_end);
         BUG_ON(env_start > env_end);
@@ -927,10 +927,10 @@ static ssize_t environ_read(struct file *file, char __user *buf,
         if (!mmget_not_zero(mm))
                 goto free;
 
-        down_read(&mm->mmap_sem);
+        spin_lock(&mm->arg_lock);
         env_start = mm->env_start;
         env_end = mm->env_end;
-        up_read(&mm->mmap_sem);
+        spin_unlock(&mm->arg_lock);
 
         while (count > 0) {
                 size_t this_len, max_len;