4 * Copyright (C) 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; only
9 * version 2.1 of the License.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include <linux/uaccess.h>
22 #include "lttng-probe-user.h"
25 * Calculate string length. Include final null terminating character if there is
26 * one, or ends at first fault. Disabling page faults ensures that we can safely
27 * call this from pretty much any context, including those where the caller
28 * holds mmap_sem, or any lock which nests in mmap_sem.
30 long lttng_strlen_user_inatomic(const char *addr
)
33 mm_segment_t old_fs
= get_fs();
41 ret
= __copy_from_user_inatomic(&v
,
42 (__force
const char __user
*)(addr
),
44 if (unlikely(ret
> 0))
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