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Groups > linux.kernel > #1238245
| From | Jiri Slaby <jslaby@suse.cz> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.12 25/84] xtensa: fix threadptr reload on return to userspace |
| Date | 2015-10-02 15:50 +0200 |
| Message-ID | <qf8SJ-4YE-1@gated-at.bofh.it> (permalink) |
| References | <qf8zn-4Bq-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Max Filippov <jcmvbkbc@gmail.com> 3.12-stable review patch. If anyone has any objections, please let me know. =============== 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: Jiri Slaby <jslaby@suse.cz> --- 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 4b8e636e60da..900137e59b20 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 -- 2.6.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH 3.12 25/84] xtensa: fix threadptr reload on return to userspace Jiri Slaby <jslaby@suse.cz> - 2015-10-02 15:50 +0200
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