Fix: ACCESS_ONCE() removed in kernel 4.15

[lttng-modules.git] / lttng-events.c

diff --git a/lttng-events.c b/lttng-events.c
index 7132485936660d3a6a9a1e4a32eb80de6b854b84..0a8b2a68b0445017603bd1bb37294d72d6024dc6 100644 (file)
--- a/lttng-events.c
+++ b/lttng-events.c
@@ -184,7 +184,7 @@ void lttng_session_destroy(struct lttng_session *session)
        int ret;
 
        mutex_lock(&sessions_mutex);
-       ACCESS_ONCE(session->active) = 0;
+       WRITE_ONCE(session->active, 0);
        list_for_each_entry(chan, &session->chan, list) {
                ret = lttng_syscalls_unregister(chan);
                WARN_ON(ret);
@@ -259,16 +259,16 @@ int lttng_session_enable(struct lttng_session *session)
                        lib_ring_buffer_clear_quiescent_channel(chan->chan);
        }
 
-       ACCESS_ONCE(session->active) = 1;
-       ACCESS_ONCE(session->been_active) = 1;
+       WRITE_ONCE(session->active, 1);
+       WRITE_ONCE(session->been_active, 1);
        ret = _lttng_session_metadata_statedump(session);
        if (ret) {
-               ACCESS_ONCE(session->active) = 0;
+               WRITE_ONCE(session->active, 0);
                goto end;
        }
        ret = lttng_statedump_start(session);
        if (ret)
-               ACCESS_ONCE(session->active) = 0;
+               WRITE_ONCE(session->active, 0);
 end:
        mutex_unlock(&sessions_mutex);
        return ret;
@@ -284,7 +284,7 @@ int lttng_session_disable(struct lttng_session *session)
                ret = -EBUSY;
                goto end;
        }
-       ACCESS_ONCE(session->active) = 0;
+       WRITE_ONCE(session->active, 0);
 
        /* Set transient enabler state to "disabled" */
        session->tstate = 0;
@@ -359,7 +359,7 @@ int lttng_channel_enable(struct lttng_channel *channel)
        channel->tstate = 1;
        lttng_session_sync_enablers(channel->session);
        /* Set atomically the state to "enabled" */
-       ACCESS_ONCE(channel->enabled) = 1;
+       WRITE_ONCE(channel->enabled, 1);
 end:
        mutex_unlock(&sessions_mutex);
        return ret;
@@ -379,7 +379,7 @@ int lttng_channel_disable(struct lttng_channel *channel)
                goto end;
        }
        /* Set atomically the state to "disabled" */
-       ACCESS_ONCE(channel->enabled) = 0;
+       WRITE_ONCE(channel->enabled, 0);
        /* Set transient enabler state to "enabled" */
        channel->tstate = 0;
        lttng_session_sync_enablers(channel->session);
@@ -409,7 +409,7 @@ int lttng_event_enable(struct lttng_event *event)
        case LTTNG_KERNEL_KPROBE:
        case LTTNG_KERNEL_FUNCTION:
        case LTTNG_KERNEL_NOOP:
-               ACCESS_ONCE(event->enabled) = 1;
+               WRITE_ONCE(event->enabled, 1);
                break;
        case LTTNG_KERNEL_KRETPROBE:
                ret = lttng_kretprobes_event_enable_state(event, 1);
@@ -444,7 +444,7 @@ int lttng_event_disable(struct lttng_event *event)
        case LTTNG_KERNEL_KPROBE:
        case LTTNG_KERNEL_FUNCTION:
        case LTTNG_KERNEL_NOOP:
-               ACCESS_ONCE(event->enabled) = 0;
+               WRITE_ONCE(event->enabled, 0);
                break;
        case LTTNG_KERNEL_KRETPROBE:
                ret = lttng_kretprobes_event_enable_state(event, 0);
@@ -1515,7 +1515,7 @@ void lttng_session_sync_enablers(struct lttng_session *session)
                 */
                enabled = enabled && session->tstate && event->chan->tstate;
 
-               ACCESS_ONCE(event->enabled) = enabled;
+               WRITE_ONCE(event->enabled, enabled);
                /*
                 * Sync tracepoint registration with event enabled
                 * state.
@@ -1641,7 +1641,7 @@ int lttng_metadata_printf(struct lttng_session *session,
        va_list ap;
        struct lttng_metadata_stream *stream;
 
-       WARN_ON_ONCE(!ACCESS_ONCE(session->active));
+       WARN_ON_ONCE(!READ_ONCE(session->active));
 
        va_start(ap, fmt);
        str = kvasprintf(GFP_KERNEL, fmt, ap);
@@ -2228,7 +2228,7 @@ int _lttng_event_metadata_statedump(struct lttng_session *session,
 {
        int ret = 0;
 
-       if (event->metadata_dumped || !ACCESS_ONCE(session->active))
+       if (event->metadata_dumped || !READ_ONCE(session->active))
                return 0;
        if (chan->channel_type == METADATA_CHANNEL)
                return 0;
@@ -2295,7 +2295,7 @@ int _lttng_channel_metadata_statedump(struct lttng_session *session,
 {
        int ret = 0;
 
-       if (chan->metadata_dumped || !ACCESS_ONCE(session->active))
+       if (chan->metadata_dumped || !READ_ONCE(session->active))
                return 0;
 
        if (chan->channel_type == METADATA_CHANNEL)
@@ -2452,7 +2452,7 @@ int _lttng_session_metadata_statedump(struct lttng_session *session)
        struct lttng_event *event;
        int ret = 0;
 
-       if (!ACCESS_ONCE(session->active))
+       if (!READ_ONCE(session->active))
                return 0;
        if (session->metadata_dumped)
                goto skip_session;