From 1e00227d4e8017ac9c3f73bf949a06c6e27f5122 Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Tue, 28 May 2013 20:21:02 +0100
Subject: [PATCH] MN10300: Fix ret_from_kernel_thread

ret_from_kernel_thread needs to set A2 to the thread_info pointer before
jumping to syscall_exit.

Without this, we never correctly start userspace.

This was caused by the rejuggling of the fork/exec paths in commit
ddf23e87a804 ("mn10300: switch to saner kernel_execve() semantics")

Reported-by: Ken Cox <jkc@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Ken Cox <jkc@redhat.com>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 arch/mn10300/kernel/entry.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S
index 68fcab8f8f6f..942005753720 100644
--- a/arch/mn10300/kernel/entry.S
+++ b/arch/mn10300/kernel/entry.S
@@ -60,6 +60,7 @@ ENTRY(ret_from_kernel_thread)
 	mov	(REG_D0,fp),d0
 	mov	(REG_A0,fp),a0
 	calls	(a0)
+	GET_THREAD_INFO a2		# A2 must be set on return from sys_exit()
 	clr	d0
 	mov	d0,(REG_D0,fp)
 	jmp	syscall_exit
-- 
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