[lttng-dev] [PATCH lttng-modules v3] Fix: build failure on 2.6.36

[Michael Jeanson]

Fixes build failure on the 2.6.36 kernel branch which misses the
vzalloc() function.

Signed-off-by: Michael Jeanson <mjeanson at efficios.com>
---
 lttng-events.c    |  5 +++--
 wrapper/vzalloc.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 2 deletions(-)
 create mode 100644 wrapper/vzalloc.h

diff --git a/lttng-events.c b/lttng-events.c
index b49851b..c49174d 100644
--- a/lttng-events.c
+++ b/lttng-events.c
@@ -50,6 +50,7 @@
 #include "lttng-events.h"
 #include "lttng-tracer.h"
 #include "lttng-abi-old.h"
+#include "wrapper/vzalloc.h"
 
 #define METADATA_CACHE_DEFAULT_SIZE 4096
 
@@ -133,7 +134,7 @@ struct lttng_session *lttng_session_create(void)
 			GFP_KERNEL);
 	if (!metadata_cache)
 		goto err_free_session;
-	metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
+	metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE);
 	if (!metadata_cache->data)
 		goto err_free_cache;
 	metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
@@ -1531,7 +1532,7 @@ int lttng_metadata_printf(struct lttng_session *session,
 		tmp_cache_alloc_size = max_t(unsigned int,
 				session->metadata_cache->cache_alloc + len,
 				session->metadata_cache->cache_alloc << 1);
-		tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
+		tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size);
 		if (!tmp_cache_realloc)
 			goto err;
 		if (session->metadata_cache->data) {
diff --git a/wrapper/vzalloc.h b/wrapper/vzalloc.h
new file mode 100644
index 0000000..c052778
--- /dev/null
+++ b/wrapper/vzalloc.h
@@ -0,0 +1,47 @@
+#ifndef _LTTNG_WRAPPER_VZALLOC_H
+#define _LTTNG_WRAPPER_VZALLOC_H
+
+/*
+ * wrapper/vzalloc.h
+ *
+ * Copyright (C) 2015 Michael Jeanson <mjeanson at 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>
+#include <linux/vmalloc.h>
+
+#if LTTNG_KERNEL_RANGE(2,6,36, 2,6,37)
+static inline
+void *lttng_vzalloc(unsigned long size)
+{
+	void *ret;
+	ret = vmalloc(size);
+	if (!ret)
+		return NULL;
+	memset(ret, 0, size);
+	return ret;
+}
+#else
+static inline
+void *lttng_vzalloc(unsigned long size)
+{
+	return vzalloc(size);
+}
+#endif
+
+
+#endif /* _LTTNG_WRAPPER_VZALLOC_H */
-- 
1.9.1