From 684b6fc55168dc03c37afed2366de6a5cd72dd2d Mon Sep 17 00:00:00 2001 From: Max Filippov Date: Sat, 4 Jul 2015 15:27:39 +0300 Subject: [PATCH] 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 Signed-off-by: Luis Henriques --- arch/xtensa/kernel/entry.S | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index a06b7efaae824..8a749f02d8d61 100644 --- 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 -- 2.47.3