-/*
-* probes/lttng-kretprobes.c
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
+ * probes/lttng-kretprobes.c
*
* LTTng kretprobes integration module.
*
* Copyright (C) 2009-2012 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
*/
#include <linux/module.h>
#include <linux/kprobes.h>
#include <linux/slab.h>
#include <linux/kref.h>
-#include "../lttng-events.h"
-#include "../wrapper/ringbuffer/frontend_types.h"
-#include "../wrapper/vmalloc.h"
-#include "../wrapper/irqflags.h"
-#include "../lttng-tracer.h"
+#include <lttng-events.h>
+#include <wrapper/ringbuffer/frontend_types.h>
+#include <wrapper/vmalloc.h>
+#include <wrapper/irqflags.h>
+#include <lttng-tracer.h>
enum lttng_kretprobe_type {
EVENT_ENTRY = 0,
unsigned long parent_ip;
} payload;
- if (unlikely(!ACCESS_ONCE(chan->session->active)))
+ if (unlikely(!READ_ONCE(chan->session->active)))
return 0;
- if (unlikely(!ACCESS_ONCE(chan->enabled)))
+ if (unlikely(!READ_ONCE(chan->enabled)))
return 0;
- if (unlikely(!ACCESS_ONCE(event->enabled)))
+ if (unlikely(!READ_ONCE(event->enabled)))
return 0;
payload.ip = (unsigned long) krpi->rp->kp.addr;
* unregistered. Same for memory allocation.
*/
kref_init(<tng_krp->kref_alloc);
- kref_get(<tng_krp->kref_alloc); /* inc refcount to 2 */
+ kref_get(<tng_krp->kref_alloc); /* inc refcount to 2, no overflow. */
kref_init(<tng_krp->kref_register);
- kref_get(<tng_krp->kref_register); /* inc refcount to 2 */
+ kref_get(<tng_krp->kref_register); /* inc refcount to 2, no overflow. */
/*
* Ensure the memory we just allocated don't trigger page faults.
}
lttng_krp = event->u.kretprobe.lttng_krp;
event_return = lttng_krp->event[EVENT_RETURN];
- ACCESS_ONCE(event->enabled) = enable;
- ACCESS_ONCE(event_return->enabled) = enable;
+ WRITE_ONCE(event->enabled, enable);
+ WRITE_ONCE(event_return->enabled, enable);
return 0;
}
EXPORT_SYMBOL_GPL(lttng_kretprobes_event_enable_state);
MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("Linux Trace Toolkit Kretprobes Support");
+MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
+MODULE_DESCRIPTION("LTTng kretprobes probes");
MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
__stringify(LTTNG_MODULES_MINOR_VERSION) "."
__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)