[PATCH] exec: move ->recursion_depth out of critical sections

[Alexey Dobriyan]

->recursion_depth is changed only by current, therefore decrementing can be
done without taking any locks.

Signed-off-by: Alexey Dobriyan <adobri...@gmail.com>
---

 fs/exec.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1652,11 +1652,13 @@ int search_binary_handler(struct linux_binprm *bprm)
                if (!try_module_get(fmt->module))
                        continue;
                read_unlock(&binfmt_lock);
+
                bprm->recursion_depth++;
                retval = fmt->load_binary(bprm);
+               bprm->recursion_depth--;
+
                read_lock(&binfmt_lock);
                put_binfmt(fmt);
-               bprm->recursion_depth--;
                if (retval < 0 && !bprm->mm) {
                        /* we got to flush_old_exec() and failed after it */
                        read_unlock(&binfmt_lock);