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| author | Max Filippov <jcmvbkbc@gmail.com> | 2015-07-04 15:27:39 +0300 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-08-26 20:01:18 +0200 |
| commit | dbace15d522b1569f8e290a99d98800335dd2ccb (patch) | |
| tree | 8228a274bf25c64c33d6aaef95f12502a780170c /arch/xtensa/kernel | |
| parent | 6708e73efa014020bbabb89864a02a111d8a8f0f (diff) | |
xtensa: fix threadptr reload on return to userspace
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 <jcmvbkbc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Guendhoer <stefan@guendhoer.com>
Diffstat (limited to 'arch/xtensa/kernel')
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index 6e53174f8..d29bac601 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -549,12 +549,13 @@ 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 |