[lttng-modules] Fix: Add support for 4.6.4-rt8 kernel

Signed-off-by: Michael Jeanson <mjeanson at efficios.com>
---
 lib/ringbuffer/ring_buffer_frontend.c | 18 +++++++++---
 wrapper/timer.h                       | 55 +++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+), 4 deletions(-)
 create mode 100644 wrapper/timer.h

Merged into master and stable-2.8, thanks!

Mathieu

----- On Jul 29, 2016, at 10:52 AM, Michael Jeanson mjeanson at efficios.com wrote:

> Signed-off-by: Michael Jeanson <mjeanson at efficios.com>
> ---
> lib/ringbuffer/ring_buffer_frontend.c | 18 +++++++++---
> wrapper/timer.h                       | 55 +++++++++++++++++++++++++++++++++++
> 2 files changed, 69 insertions(+), 4 deletions(-)
> create mode 100644 wrapper/timer.h
> 
> diff --git a/lib/ringbuffer/ring_buffer_frontend.c
> b/lib/ringbuffer/ring_buffer_frontend.c
> index 379bf95..89eefe9 100644
> --- a/lib/ringbuffer/ring_buffer_frontend.c
> +++ b/lib/ringbuffer/ring_buffer_frontend.c
> @@ -63,6 +63,7 @@
> #include <wrapper/atomic.h>
> #include <wrapper/kref.h>
> #include <wrapper/percpu-defs.h>
> +#include <wrapper/timer.h>
> 
> /*
>  * Internal structure representing offsets to use at a sub-buffer switch.
> @@ -281,7 +282,7 @@ static void switch_buffer_timer(unsigned long data)
> 		lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
> 
> 	if (config->alloc == RING_BUFFER_ALLOC_PER_CPU)
> -		mod_timer_pinned(&buf->switch_timer,
> +		lttng_mod_timer_pinned(&buf->switch_timer,
> 				 jiffies + chan->switch_timer_interval);
> 	else
> 		mod_timer(&buf->switch_timer,
> @@ -298,7 +299,12 @@ static void lib_ring_buffer_start_switch_timer(struct
> lib_ring_buffer *buf)
> 
> 	if (!chan->switch_timer_interval || buf->switch_timer_enabled)
> 		return;
> -	init_timer(&buf->switch_timer);
> +
> +	if (config->alloc == RING_BUFFER_ALLOC_PER_CPU)
> +		lttng_init_timer_pinned(&buf->switch_timer);
> +	else
> +		init_timer(&buf->switch_timer);
> +
> 	buf->switch_timer.function = switch_buffer_timer;
> 	buf->switch_timer.expires = jiffies + chan->switch_timer_interval;
> 	buf->switch_timer.data = (unsigned long)buf;
> @@ -341,7 +347,7 @@ static void read_buffer_timer(unsigned long data)
> 	}
> 
> 	if (config->alloc == RING_BUFFER_ALLOC_PER_CPU)
> -		mod_timer_pinned(&buf->read_timer,
> +		lttng_mod_timer_pinned(&buf->read_timer,
> 				 jiffies + chan->read_timer_interval);
> 	else
> 		mod_timer(&buf->read_timer,
> @@ -361,7 +367,11 @@ static void lib_ring_buffer_start_read_timer(struct
> lib_ring_buffer *buf)
> 	    || buf->read_timer_enabled)
> 		return;
> 
> -	init_timer(&buf->read_timer);
> +	if (config->alloc == RING_BUFFER_ALLOC_PER_CPU)
> +		lttng_init_timer_pinned(&buf->read_timer);
> +	else
> +		init_timer(&buf->read_timer);
> +
> 	buf->read_timer.function = read_buffer_timer;
> 	buf->read_timer.expires = jiffies + chan->read_timer_interval;
> 	buf->read_timer.data = (unsigned long)buf;
> diff --git a/wrapper/timer.h b/wrapper/timer.h
> new file mode 100644
> index 0000000..441a017
> --- /dev/null
> +++ b/wrapper/timer.h
> @@ -0,0 +1,55 @@
> +#ifndef _LTTNG_WRAPPER_TIMER_H
> +#define _LTTNG_WRAPPER_TIMER_H
> +
> +/*
> + * wrapper/timer.h
> + *
> + * wrapper around linux/timer.h.
> + *
> + * Copyright (C) 2016 Michael Jeanson <mjeanson at 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/version.h>
> +#include <linux/timer.h>
> +#include <lttng-kernel-version.h>
> +
> +
> +#if (LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8))
> +
> +#define lttng_init_timer_pinned(timer)					\
> +	init_timer_pinned(timer)
> +
> +static inline int lttng_mod_timer_pinned(struct timer_list *timer,
> +		unsigned long expires)
> +{
> +	return mod_timer(timer, expires);
> +}
> +
> +#else /* #if (LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8)) */
> +
> +#define lttng_init_timer_pinned(timer)					\
> +	init_timer(timer)
> +
> +static inline int lttng_mod_timer_pinned(struct timer_list *timer,
> +		unsigned long expires)
> +{
> +	return mod_timer_pinned(timer, expires);
> +}
> +
> +#endif /* #else #if (LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8))
> */
> +
> +#endif /* _LTTNG_WRAPPER_TIMER_H */
> --
> 2.7.4