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Subject: Re: Ping: [PATCH v15 00/13] support "task_isolation" mode
To: Chris Metcalf <cmetcalf@mellanox.com>,
        Gilad Ben Yossef <giladb@mellanox.com>,
        Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@kernel.org>,
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        Christoph Lameter <cl@linux.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Daniel Lezcano <daniel.lezcano@linaro.org>, linux-doc@vger.kernel.org,
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From: Francis Giraldeau <francis.giraldeau@gmail.com>
Message-ID: <f06314d5-9aee-b6e2-06dc-69bf6c0a9504@gmail.com>
Date: Thu, 8 Sep 2016 12:21:39 -0400
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On 2016-09-07 05:11 PM, Francis Giraldeau wrote:
> The syscall test fails on x86:
>     $ sudo ./isolation
>     [...]
>     test_syscall: FAIL (0x100)
>     test_syscall (SIGUSR1): FAIL (0x100)

The fix is indeed very simple:

diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index 7255367..449e2b5 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -139,7 +139,7 @@ struct thread_info {
 #define _TIF_WORK_SYSCALL_ENTRY        \
        (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT |   \
         _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT |       \
-        _TIF_NOHZ)
+        _TIF_NOHZ | _TIF_TASK_ISOLATION)
 
 /* work to do on any return to user space */
 #define _TIF_ALLWORK_MASK                                              \


I updated the branch accordingly:

https://github.com/giraldeau/linux/commit/057761af7bde087fa10aa42554a13a7b69071938

Thanks,

Francis