linux-kernel - [PATCH 1/4] MN10300: Fix ret_from_kernel

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Message-ID: <20130528143409.9790.41260.stgit@warthog.procyon.org.uk>
Date:	Tue, 28 May 2013 15:34:09 +0100
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...ux-foundation.org
Cc:	Al Viro <viro@...IV.linux.org.uk>, linux-am33-list@...hat.com,
	linux-kernel@...r.kernel.org, Ken Cox <jkc@...hat.com>
Subject: [PATCH 1/4] 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:

	ddf23e87a804cbf6fa3818076b33fe023cce09fd
	Author: Al Viro <viro@...iv.linux.org.uk>
	Date:   Thu Oct 11 17:32:41 2012 -0400
	Subject: mn10300: switch to saner kernel_execve() semantics

Reported-by: Ken Cox <jkc@...hat.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Acked-by: Ken Cox <jkc@...hat.com>
Acked-by: Al Viro <viro@...IV.linux.org.uk>
---

 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 0c631d3..92c3eea 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()
 	jmp	sys_exit
 
 ENTRY(ret_from_kernel_execve)

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