/usr/src/lttng-modules-2.7.1/wrapper/page_alloc.c is in lttng-modules-dkms 2.7.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* wrapper/page_alloc.c
*
* 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"
#if (defined(CONFIG_KALLSYMS) \
&& (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2) \
|| LTTNG_DEBIAN_KERNEL_RANGE(3,16,7,9,0,0, 3,17,0,0,0,0)))
#include <linux/kallsyms.h>
#include <linux/mm_types.h>
#include <linux/module.h>
#include "kallsyms.h"
#include "page_alloc.h"
static
unsigned long (*get_pfnblock_flags_mask_sym)(struct page *page,
unsigned long pfn,
unsigned long end_bitidx,
unsigned long mask);
unsigned long wrapper_get_pfnblock_flags_mask(struct page *page,
unsigned long pfn,
unsigned long end_bitidx,
unsigned long mask)
{
WARN_ON_ONCE(!get_pfnblock_flags_mask_sym);
if (get_pfnblock_flags_mask_sym) {
return get_pfnblock_flags_mask_sym(page, pfn, end_bitidx, mask);
} else {
return -ENOSYS;
}
}
EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask);
int wrapper_get_pfnblock_flags_mask_init(void)
{
get_pfnblock_flags_mask_sym =
(void *) kallsyms_lookup_funcptr("get_pfnblock_flags_mask");
if (!get_pfnblock_flags_mask_sym)
return -1;
return 0;
}
#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 "kallsyms.h"
#include "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;
}
#else
#include <linux/pageblock-flags.h>
#endif
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