This is a note to let you know that I've just added the patch titled
xtensa: fix threadptr reload on return to userspace
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xtensa-fix-threadptr-reload-on-return-to-userspace.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 4229fb12a03e5da5882b420b0aa4a02e77447b86 Mon Sep 17 00:00:00 2001
From: Max Filippov <[email protected]>
Date: Sat, 4 Jul 2015 15:27:39 +0300
Subject: xtensa: fix threadptr reload on return to userspace
From: Max Filippov <[email protected]>
commit 4229fb12a03e5da5882b420b0aa4a02e77447b86 upstream.
Userspace return code may skip restoring THREADPTR register if there are
no registers that need to be zeroed. This leads to spurious failures in
libc NPTL tests.
Always restore THREADPTR on return to userspace.
Signed-off-by: Max Filippov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/xtensa/kernel/entry.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -568,12 +568,13 @@ user_exception_exit:
* (if we have restored WSBITS-1 frames).
*/
+2:
#if XCHAL_HAVE_THREADPTR
l32i a3, a1, PT_THREADPTR
wur a3, threadptr
#endif
-2: j common_exception_exit
+ j common_exception_exit
/* This is the kernel exception exit.
* We avoided to do a MOVSP when we entered the exception, but we
Patches currently in stable-queue which might be from [email protected] are
queue-4.1/xtensa-fix-kernel-register-spilling.patch
queue-4.1/xtensa-fix-threadptr-reload-on-return-to-userspace.patch
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