From: Michael Jeanson <mjeanson@efficios.com>
Date: Fri, 11 Sep 2015 20:06:25 +0000 (-0400)
Subject: Fix: lttng-test build failure for kernels < 3.0
X-Git-Tag: v2.8.0-rc1~75
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=5a18f28d14f483c240e4dabd34c08a038ea01484;p=lttng-modules.git

Fix: lttng-test build failure for kernels < 3.0

Fixes an undefined reference to kstrtouint_from_user.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/probes/lttng-test.c b/probes/lttng-test.c
index 2a66f455..bd9f5f89 100644
--- a/probes/lttng-test.c
+++ b/probes/lttng-test.c
@@ -28,6 +28,7 @@
 #include "../lttng-events.h"
 #include "../lttng-tracer.h"
 #include "../wrapper/tracepoint.h"
+#include "../wrapper/kstrtox.h"
 
 #define TP_MODULE_NOAUTOLOAD
 #define LTTNG_PACKAGE_BUILD
@@ -76,7 +77,7 @@ ssize_t lttng_test_filter_event_write(struct file *file, const char __user *user
 	int ret;
 
 	/* Get the number of iterations */
-	ret = kstrtouint_from_user(user_buf, count, 10, &nr_iter);
+	ret = lttng_kstrtouint_from_user(user_buf, count, 10, &nr_iter);
 	if (ret) {
 		written = ret;
 		goto end;
diff --git a/wrapper/kstrtox.h b/wrapper/kstrtox.h
new file mode 100644
index 00000000..0f0666fe
--- /dev/null
+++ b/wrapper/kstrtox.h
@@ -0,0 +1,58 @@
+#ifndef _LTTNG_WRAPPER_KSTRTOX_H
+#define _LTTNG_WRAPPER_KSTRTOX_H
+
+/*
+ * wrapper/kstrtox.h
+ *
+ * Copyright (C) 2015 Michael Jeanson <mjeanson@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/version.h>
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,0,0))
+
+/* Excludes final \0. */
+#define LTTNG_MAX_UINT_CHAR 10
+
+static inline
+int __must_check lttng_kstrtouint_from_user(const char __user *ubuf,
+		size_t count, unsigned int base, unsigned int *res)
+{
+	unsigned int _res;
+	char kbuf[LTTNG_MAX_UINT_CHAR + 1], *endptr;
+
+	memset(kbuf, 0, sizeof(kbuf));
+	if (copy_from_user(kbuf, ubuf, min_t(size_t, LTTNG_MAX_UINT_CHAR, count)))
+		return -EFAULT;
+
+	_res = simple_strtoul(kbuf, &endptr, base);
+	if (!endptr)
+		return -EINVAL;
+
+	*res = _res;
+	return 0;
+}
+#else
+static inline
+int __must_check lttng_kstrtouint_from_user(const char __user *ubuf,
+		size_t count, unsigned int base, unsigned int *res)
+{
+	return kstrtouint_from_user(ubuf, count, base, res);
+}
+#endif
+
+#endif /* _LTTNG_WRAPPER_KSTRTOX_H */