/usr/src/lttng-modules-2.7.1/wrapper/writeback.h 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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | #ifndef _LTTNG_WRAPPER_WRITEBACK_H
#define _LTTNG_WRAPPER_WRITEBACK_H
/*
* wrapper/writeback.h
*
* wrapper around global_dirty_limit read. Using KALLSYMS with KALLSYMS_ALL
* to get its address when available, else we need to have a kernel that
* exports this variable to GPL modules.
*
* Copyright (C) 2013 Mentor Graphics Corp.
*
* 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
*/
#ifdef CONFIG_KALLSYMS_ALL
#include <linux/kallsyms.h>
#include "kallsyms.h"
static unsigned long *global_dirty_limit_sym;
static inline
unsigned long wrapper_global_dirty_limit(void)
{
if (!global_dirty_limit_sym)
global_dirty_limit_sym =
(void *) kallsyms_lookup_dataptr("global_dirty_limit");
if (global_dirty_limit_sym) {
return *global_dirty_limit_sym;
} else {
printk(KERN_WARNING "LTTng: global_dirty_limit symbol lookup failed.\n");
return 0;
}
}
#else
#include <linux/writeback.h>
static inline
unsigned long wrapper_global_dirty_limit(void)
{
return global_dirty_limit;
}
#endif
#endif /* _LTTNG_WRAPPER_WRITEBACK_H */
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