Update README.md for supported kernel

[lttng-modules.git] / wrapper / trace-clock.h

diff --git a/wrapper/trace-clock.h b/wrapper/trace-clock.h
index 08f99229225e6e870d5d78d13d0446f5cc357b0c..28ee90ebf0434aa0fb3015c4f8c42d833a4a0b98 100644 (file)
--- a/wrapper/trace-clock.h
+++ b/wrapper/trace-clock.h
@@ -1,29 +1,16 @@
-#ifndef _LTTNG_TRACE_CLOCK_H
-#define _LTTNG_TRACE_CLOCK_H
-
-/*
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
  * wrapper/trace-clock.h
  *
  * Contains LTTng trace clock mapping to LTTng trace clock or mainline monotonic
  * clock. This wrapper depends on CONFIG_HIGH_RES_TIMERS=y.
  *
  * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#ifndef _LTTNG_TRACE_CLOCK_H
+#define _LTTNG_TRACE_CLOCK_H
+
 #ifdef CONFIG_HAVE_TRACE_CLOCK
 #include <linux/trace-clock.h>
 #else /* CONFIG_HAVE_TRACE_CLOCK */
@@ -34,32 +21,14 @@
 #include <linux/hrtimer.h>
 #include <linux/percpu.h>
 #include <linux/version.h>
+#include <linux/percpu-defs.h>
 #include <asm/local.h>
 #include <lttng-kernel-version.h>
 #include <lttng-clock.h>
-#include <wrapper/compiler.h>
-#include <wrapper/percpu-defs.h>
-#include <wrapper/random.h>
-
-#if ((LTTNG_KERNEL_RANGE(3,10,0, 3,10,14) && !LTTNG_RHEL_KERNEL_RANGE(3,10,0,123,0,0, 3,10,14,0,0,0)) \
-       || LTTNG_KERNEL_RANGE(3,11,0, 3,11,3))
-#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
+#include <linux/random.h>
 
 extern struct lttng_trace_clock *lttng_trace_clock;
 
-/*
- * Upstream Linux commit 27727df240c7 ("Avoid taking lock in NMI path with
- * CONFIG_DEBUG_TIMEKEEPING") introduces a buggy ktime_get_mono_fast_ns().
- * This is fixed by patch "timekeeping: Fix __ktime_get_fast_ns() regression".
- */
-#if (LTTNG_KERNEL_RANGE(4,8,0, 4,8,2) \
-       || LTTNG_KERNEL_RANGE(4,7,4, 4,7,8) \
-       || LTTNG_KERNEL_RANGE(4,4,20, 4,4,25) \
-       || LTTNG_KERNEL_RANGE(4,1,32, 4,1,35))
-#define LTTNG_CLOCK_NMI_SAFE_BROKEN
-#endif
-
 /*
  * We need clock values to be monotonically increasing per-cpu, which is
  * not strictly guaranteed by ktime_get_mono_fast_ns(). It is
@@ -68,9 +37,7 @@ extern struct lttng_trace_clock *lttng_trace_clock;
  * this feature on 64-bit architectures.
  */
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) \
-       && BITS_PER_LONG == 64 \
-       && !defined(LTTNG_CLOCK_NMI_SAFE_BROKEN))
+#if BITS_PER_LONG == 64
 #define LTTNG_USE_NMI_SAFE_CLOCK
 #endif
 
@@ -88,7 +55,7 @@ static inline u64 trace_clock_monotonic_wrapper(void)
 
        /* Use fast nmi-safe monotonic clock provided by the Linux kernel. */
        preempt_disable();
-       last_tsc_ptr = lttng_this_cpu_ptr(&lttng_last_tsc);
+       last_tsc_ptr = this_cpu_ptr(&lttng_last_tsc);
        last = *last_tsc_ptr;
        /*
         * Read "last" before "now". It is not strictly required, but it ensures
@@ -144,7 +111,11 @@ static inline u64 trace_clock_freq_monotonic(void)
 
 static inline int trace_clock_uuid_monotonic(char *uuid)
 {
-       return wrapper_get_bootid(uuid);
+       unsigned char *boot_id;
+
+       boot_id = get_kernel_boot_id();
+       sprintf(uuid, "%pU", boot_id);
+       return 0;
 }
 
 static inline const char *trace_clock_name_monotonic(void)