-#ifndef _LIB_RING_BUFFER_FRONTEND_API_H
-#define _LIB_RING_BUFFER_FRONTEND_API_H
-
-/*
+/* SPDX-License-Identifier: (GPL-2.0 OR LGPL-2.1)
+ *
* lib/ringbuffer/frontend_api.h
*
* Ring Buffer Library Synchronization Header (buffer write API).
*
* 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.
* See linux/ringbuffer/frontend.h for channel allocation and read-side API.
*/
+#ifndef _LIB_RING_BUFFER_FRONTEND_API_H
+#define _LIB_RING_BUFFER_FRONTEND_API_H
+
#include <wrapper/ringbuffer/frontend.h>
#include <wrapper/percpu-defs.h>
#include <linux/errno.h>
nesting = ++per_cpu(lib_ring_buffer_nesting, cpu);
barrier();
- if (unlikely(nesting > 4)) {
+ if (unlikely(nesting > RING_BUFFER_MAX_NESTING)) {
WARN_ON_ONCE(1);
per_cpu(lib_ring_buffer_nesting, cpu)--;
rcu_read_unlock_sched_notrace();
static inline
int lib_ring_buffer_try_reserve(const struct lib_ring_buffer_config *config,
struct lib_ring_buffer_ctx *ctx,
+ void *client_ctx,
unsigned long *o_begin, unsigned long *o_end,
unsigned long *o_old, size_t *before_hdr_pad)
{
return 1;
ctx->slot_size = record_header_size(config, chan, *o_begin,
- before_hdr_pad, ctx);
+ before_hdr_pad, ctx, client_ctx);
ctx->slot_size +=
lib_ring_buffer_align(*o_begin + ctx->slot_size,
ctx->largest_align) + ctx->data_size;
static inline
int lib_ring_buffer_reserve(const struct lib_ring_buffer_config *config,
- struct lib_ring_buffer_ctx *ctx)
+ struct lib_ring_buffer_ctx *ctx,
+ void *client_ctx)
{
struct channel *chan = ctx->chan;
struct lib_ring_buffer *buf;
/*
* Perform retryable operations.
*/
- if (unlikely(lib_ring_buffer_try_reserve(config, ctx, &o_begin,
+ if (unlikely(lib_ring_buffer_try_reserve(config, ctx, client_ctx, &o_begin,
&o_end, &o_old, &before_hdr_pad)))
goto slow_path;
ctx->buf_offset = o_begin + before_hdr_pad;
return 0;
slow_path:
- return lib_ring_buffer_reserve_slow(ctx);
+ return lib_ring_buffer_reserve_slow(ctx, client_ctx);
}
/**