-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
* wrapper/page_alloc.c
*
- * wrapper around get_pfnblock_flags_mask. Using KALLSYMS to get its address
- * when available, else we need to have a kernel that exports this function to
- * GPL modules.
+ * wrapper around get_pfnblock_flags_mask and Ubuntu
+ * get_pageblock_flags_mask. Using KALLSYMS to get their address when
+ * available, else we need to have a kernel that exports this function
+ * to GPL modules.
*
* Copyright (C) 2015 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 "../lttng-kernel-version.h"
+#include <lttng-kernel-version.h>
-#if defined(CONFIG_KALLSYMS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2))
+#if (defined(CONFIG_KALLSYMS) \
+ && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2) \
+ || LTTNG_KERNEL_RANGE(3,14,36, 3,15,0) \
+ || LTTNG_KERNEL_RANGE(3,18,10, 3,19,0) \
+ || LTTNG_DEBIAN_KERNEL_RANGE(3,16,7,9,0,0, 3,17,0,0,0,0) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(3,16,7,34, 3,17,0,0)))
#include <linux/kallsyms.h>
#include <linux/mm_types.h>
#include <linux/module.h>
-#include "kallsyms.h"
-#include "page_alloc.h"
+#include <wrapper/kallsyms.h>
+#include <wrapper/page_alloc.h>
static
unsigned long (*get_pfnblock_flags_mask_sym)(struct page *page,
return -1;
return 0;
}
+EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init);
+
+/*
+ * Canary function to check for 'get_pfnblock_flags_mask()' at compile time.
+ *
+ * From 'include/linux/pageblock-flags.h':
+ *
+ * unsigned long get_pfnblock_flags_mask(struct page *page,
+ * unsigned long pfn,
+ * unsigned long end_bitidx,
+ * unsigned long mask);
+ */
+__attribute__((unused)) static
+unsigned long __canary__get_pfnblock_flags_mask(struct page *page,
+ unsigned long pfn,
+ unsigned long end_bitidx,
+ unsigned long mask)
+{
+ return get_pfnblock_flags_mask(page, pfn, end_bitidx, mask);
+}
+
+#else
+
+#include <linux/pageblock-flags.h>
+
+#endif
+
+#if (defined(CONFIG_KALLSYMS) \
+ && LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,50, 3,14,0,0))
+
+#include <linux/kallsyms.h>
+#include <linux/mm_types.h>
+#include <linux/module.h>
+#include <wrapper/kallsyms.h>
+#include <wrapper/page_alloc.h>
+
+static
+unsigned long (*get_pageblock_flags_mask_sym)(struct page *page,
+ unsigned long end_bitidx,
+ unsigned long mask);
+
+unsigned long wrapper_get_pageblock_flags_mask(struct page *page,
+ unsigned long end_bitidx,
+ unsigned long mask)
+{
+ WARN_ON_ONCE(!get_pageblock_flags_mask_sym);
+ if (get_pageblock_flags_mask_sym) {
+ return get_pageblock_flags_mask_sym(page, end_bitidx, mask);
+ } else {
+ return -ENOSYS;
+ }
+}
+EXPORT_SYMBOL_GPL(wrapper_get_pageblock_flags_mask);
+
+int wrapper_get_pageblock_flags_mask_init(void)
+{
+ get_pageblock_flags_mask_sym =
+ (void *) kallsyms_lookup_funcptr("get_pageblock_flags_mask");
+ if (!get_pageblock_flags_mask_sym)
+ return -1;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init);
-#else /* #if defined(CONFIG_KALLSYMS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)) */
+#else
#include <linux/pageblock-flags.h>
-#endif /* #else #if defined(CONFIG_KALLSYMS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)) */
+#endif