Fix: wrapper random documentation

[lttng-modules.git] / lib / ringbuffer / backend_internal.h

diff --git a/lib/ringbuffer/backend_internal.h b/lib/ringbuffer/backend_internal.h
index cb39ff69fe21fe6bc25fcd9df45e39515a537f71..5ad6fac24f6124b6b88a13d50911c22bfb923740 100644 (file)
--- a/lib/ringbuffer/backend_internal.h
+++ b/lib/ringbuffer/backend_internal.h
@@ -1,28 +1,16 @@
-#ifndef _LIB_RING_BUFFER_BACKEND_INTERNAL_H
-#define _LIB_RING_BUFFER_BACKEND_INTERNAL_H
-
-/*
+/* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only)
+ *
  * lib/ringbuffer/backend_internal.h
  *
  * Ring buffer backend (internal helpers).
  *
  * Copyright (C) 2008-2012 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 _LIB_RING_BUFFER_BACKEND_INTERNAL_H
+#define _LIB_RING_BUFFER_BACKEND_INTERNAL_H
+
+#include <wrapper/compiler.h>
 #include <wrapper/ringbuffer/config.h>
 #include <wrapper/ringbuffer/backend_types.h>
 #include <wrapper/ringbuffer/frontend_types.h>
@@ -171,7 +159,7 @@ void subbuffer_id_set_noref_offset(const struct lib_ring_buffer_config *config,
                tmp |= offset << SB_ID_OFFSET_SHIFT;
                tmp |= SB_ID_NOREF_MASK;
                /* Volatile store, read concurrently by readers. */
-               ACCESS_ONCE(*id) = tmp;
+               WRITE_ONCE(*id, tmp);
        }
 }
 
@@ -379,7 +367,7 @@ void lib_ring_buffer_clear_noref(const struct lib_ring_buffer_config *config,
         * Performing a volatile access to read the sb_pages, because we want to
         * read a coherent version of the pointer and the associated noref flag.
         */
-       id = ACCESS_ONCE(bufb->buf_wsb[idx].id);
+       id = READ_ONCE(bufb->buf_wsb[idx].id);
        for (;;) {
                /* This check is called on the fast path for each record. */
                if (likely(!subbuffer_id_is_noref(config, id))) {
@@ -448,7 +436,7 @@ int update_read_sb_index(const struct lib_ring_buffer_config *config,
        if (config->mode == RING_BUFFER_OVERWRITE) {
                /*
                 * Exchange the target writer subbuffer with our own unused
-                * subbuffer. No need to use ACCESS_ONCE() here to read the
+                * subbuffer. No need to use READ_ONCE() here to read the
                 * old_wpage, because the value read will be confirmed by the
                 * following cmpxchg().
                 */
@@ -479,7 +467,7 @@ int update_read_sb_index(const struct lib_ring_buffer_config *config,
 }
 
 static inline __attribute__((always_inline))
-void lttng_inline_memcpy(void *dest, const void __user *src,
+void lttng_inline_memcpy(void *dest, const void *src,
                unsigned long len)
 {
        switch (len) {