fix: tracepoint: Optimize using static_call() (v5.10)

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

diff --git a/probes/lttng.c b/probes/lttng.c
index 449d8a5cb7f4f5192604d1689ae73935e3bc1e97..7ddaa69f00281c347b49a27c78ba14326a864167 100644 (file)
--- a/probes/lttng.c
+++ b/probes/lttng.c
@@ -1,27 +1,14 @@
-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
  * lttng.c
  *
  * LTTng logger ABI
  *
  * Copyright (C) 2008-2014 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
  */
 
 #include <linux/module.h>
-#include <linux/tracepoint.h>
+#include <wrapper/tracepoint.h>
 #include <linux/uaccess.h>
 #include <linux/gfp.h>
 #include <linux/fs.h>
@@ -45,7 +32,10 @@
 #define LTTNG_LOGGER_COUNT_MAX 1024
 #define LTTNG_LOGGER_FILE      "lttng-logger"
 
-DEFINE_TRACE(lttng_logger);
+LTTNG_DEFINE_TRACE(lttng_logger,
+       PARAMS(const char __user *text, size_t len),
+       PARAMS(text, len)
+);
 
 static struct proc_dir_entry *lttng_logger_dentry;
 
@@ -106,6 +96,18 @@ static const struct file_operations lttng_logger_operations = {
        .write = lttng_logger_write,
 };
 
+/*
+ * Linux 5.6 introduced a separate proc_ops struct for /proc operations
+ * to decouple it from the vfs.
+ */
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops lttng_logger_proc_ops = {
+       .proc_write = lttng_logger_write,
+};
+#else
+#define lttng_logger_proc_ops lttng_logger_operations
+#endif
+
 static struct miscdevice logger_dev = {
        .minor = MISC_DYNAMIC_MINOR,
        .name = "lttng-logger",
@@ -117,7 +119,7 @@ int __init lttng_logger_init(void)
 {
        int ret = 0;
 
-       wrapper_vmalloc_sync_all();
+       wrapper_vmalloc_sync_mappings();
 
        /* /dev/lttng-logger */
        ret = misc_register(&logger_dev);
@@ -129,7 +131,7 @@ int __init lttng_logger_init(void)
        /* /proc/lttng-logger */
        lttng_logger_dentry = proc_create_data(LTTNG_LOGGER_FILE,
                                S_IRUGO | S_IWUGO, NULL,
-                               &lttng_logger_operations, NULL);
+                               &lttng_logger_proc_ops, NULL);
        if (!lttng_logger_dentry) {
                printk(KERN_ERR "Error creating LTTng logger proc file\n");
                ret = -ENOMEM;