Cleanup: move to kernel style SPDX license identifiers

[deliverable/lttng-modules.git] / lib / ringbuffer / frontend_internal.h

diff --git a/lib/ringbuffer/frontend_internal.h b/lib/ringbuffer/frontend_internal.h
index 32785853b721bb3a6d0aebedce45607bab8efb0b..d02a73d32c2a46bc8a26469e1fddb0fb6eb762f1 100644 (file)
--- a/lib/ringbuffer/frontend_internal.h
+++ b/lib/ringbuffer/frontend_internal.h
@@ -1,33 +1,17 @@
-#ifndef _LIB_RING_BUFFER_FRONTEND_INTERNAL_H
-#define _LIB_RING_BUFFER_FRONTEND_INTERNAL_H
-
-/*
+/* SPDX-License-Identifier: (GPL-2.0 OR LGPL-2.1)
+ *
  * linux/ringbuffer/frontend_internal.h
  *
  * Ring Buffer Library Synchronization Header (internal helpers).
  *
  * Copyright (C) 2005-2012 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
- *
- * Author:
- *     Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
  * See ring_buffer_frontend.c for more information on wait-free algorithms.
  */
 
+#ifndef _LIB_RING_BUFFER_FRONTEND_INTERNAL_H
+#define _LIB_RING_BUFFER_FRONTEND_INTERNAL_H
+
 #include <wrapper/ringbuffer/config.h>
 #include <wrapper/ringbuffer/backend_types.h>
 #include <wrapper/ringbuffer/frontend_types.h>
@@ -150,7 +134,8 @@ int last_tsc_overflow(const struct lib_ring_buffer_config *config,
 #endif
 
 extern
-int lib_ring_buffer_reserve_slow(struct lib_ring_buffer_ctx *ctx);
+int lib_ring_buffer_reserve_slow(struct lib_ring_buffer_ctx *ctx,
+               void *client_ctx);
 
 extern
 void lib_ring_buffer_switch_slow(struct lib_ring_buffer *buf,
@@ -167,7 +152,6 @@ void lib_ring_buffer_check_deliver_slow(const struct lib_ring_buffer_config *con
 
 extern
 void lib_ring_buffer_switch_remote(struct lib_ring_buffer *buf);
-
 extern
 void lib_ring_buffer_switch_remote_empty(struct lib_ring_buffer *buf);
 
@@ -288,9 +272,9 @@ static inline
 void lib_ring_buffer_write_commit_counter(const struct lib_ring_buffer_config *config,
                                          struct lib_ring_buffer *buf,
                                          struct channel *chan,
-                                         unsigned long idx,
                                          unsigned long buf_offset,
-                                         unsigned long commit_count)
+                                         unsigned long commit_count,
+                                         struct commit_counters_hot *cc_hot)
 {
        unsigned long commit_seq_old;
 
@@ -306,10 +290,9 @@ void lib_ring_buffer_write_commit_counter(const struct lib_ring_buffer_config *c
        if (unlikely(subbuf_offset(buf_offset - commit_count, chan)))
                return;
 
-       commit_seq_old = v_read(config, &buf->commit_hot[idx].seq);
-       while ((long) (commit_seq_old - commit_count) < 0)
-               commit_seq_old = v_cmpxchg(config, &buf->commit_hot[idx].seq,
-                                          commit_seq_old, commit_count);
+       commit_seq_old = v_read(config, &cc_hot->seq);
+       if (likely((long) (commit_seq_old - commit_count) < 0))
+               v_set(config, &cc_hot->seq, commit_count);
 }
 
 extern int lib_ring_buffer_create(struct lib_ring_buffer *buf,