[PATCH] proc: fix ->stack_start in compat mode

[Alexey Dobriyan]

Assign tsk->stack_start even when doing compat execve(2).

As side effect, fix segfault inside boehm-gc library.
http://bugzilla.kernel.org/show_bug.cgi?id=14478

Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---

 Michael, please, confirm.

 Stefani, I get "Stack usage: 0 kB", you may want to look at it.

 fs/compat.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1532,6 +1532,8 @@ int compat_do_execve(char * filename,
 	if (retval < 0)
 		goto out;
 
+	current->stack_start = current->mm->start_stack;
+
 	/* execve succeeded */
 	current->fs->in_exec = 0;
 	current->in_execve = 0;
--
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