/usr/src/lttng-modules-2.7.1/wrapper/vmalloc.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 62 63 | #ifndef _LTTNG_WRAPPER_VMALLOC_H
#define _LTTNG_WRAPPER_VMALLOC_H
/*
* wrapper/vmalloc.h
*
* wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when
* available, else we need to have a kernel that exports this function to GPL
* modules.
*
* Copyright (C) 2011-2012 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
*/
#ifdef CONFIG_KALLSYMS
#include <linux/kallsyms.h>
#include "kallsyms.h"
static inline
void wrapper_vmalloc_sync_all(void)
{
void (*vmalloc_sync_all_sym)(void);
vmalloc_sync_all_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_all");
if (vmalloc_sync_all_sym) {
vmalloc_sync_all_sym();
} else {
#ifdef CONFIG_X86
/*
* Only x86 needs vmalloc_sync_all to make sure LTTng does not
* trigger recursive page faults.
*/
printk(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n");
printk(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
#endif
}
}
#else
#include <linux/vmalloc.h>
static inline
void wrapper_vmalloc_sync_all(void)
{
return vmalloc_sync_all();
}
#endif
#endif /* _LTTNG_WRAPPER_VMALLOC_H */
|