linux-kernel - [lttng-modules commit] LTTng trace-clock: shrink kernel blacklist

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Date:	Thu, 19 Sep 2013 15:08:34 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	lttng-dev@...ts.lttng.org, linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	John Stultz <john.stultz@...aro.org>
Subject: [lttng-modules commit] LTTng trace-clock: shrink kernel blacklist

commit 9998f5216f4641a79e158135c4c1658dcc6cd2d8
Author: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Date:   Thu Sep 19 13:59:48 2013 -0500

    LTTng trace-clock: shrink kernel blacklist
    
    The lockup fix has been pulled into Linux master as:
    
    commit 7bd36014460f793c19e7d6c94dab67b0afcfcb7f
    Author: John Stultz <john.stultz@...aro.org>
    Date:   Wed Sep 11 16:50:56 2013 -0700
    
        timekeeping: Fix HRTICK related deadlock from ntp lock changes
    
    Guessing the stable kernel versions in which this fix will appear in
    3.10 and 3.11 stable. 3.12+ are OK.
    
    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
    Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
    Cc: John Stultz <john.stultz@...aro.org>

diff --git a/wrapper/trace-clock.h b/wrapper/trace-clock.h
index 4266f25..d31141d 100644
--- a/wrapper/trace-clock.h
+++ b/wrapper/trace-clock.h
@@ -33,10 +33,11 @@
 #include <linux/time.h>
 #include <linux/hrtimer.h>
 #include <linux/version.h>
+#include "../lttng-kernel-version.h"
 #include "random.h"
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0))
-#error "Linux kernels 3.10 and 3.11 introduce a deadlock in the timekeeping subsystem. See http://lkml.kernel.org/r/1378943457-27314-1-git-send-email-john.stultz@linaro.org for details. Awaiting patch merge into Linux master, stable-3.10 and stable-3.11 for fine-grained kernel version blacklisting."
+#if LTTNG_KERNEL_RANGE(3,10,0, 3,10,13) || LTTNG_KERNEL_RANGE(3,11,0, 3,11,2)
+#error "Linux kernels 3.10 and 3.11 introduce a deadlock in the timekeeping subsystem. Fixed by commit 7bd36014460f793c19e7d6c94dab67b0afcfcb7f \"timekeeping: Fix HRTICK related deadlock from ntp lock changes\" in Linux."
 #endif
 
 static inline u64 trace_clock_monotonic_wrapper(void)

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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