tracing: Fix preempt count leak
commit
1dbd1951f39e13da579ffe879cce19586d0462de upstream.
While running my ftrace stress test, this showed up:
BUG: sleeping function called from invalid context at mm/mmap.c:233
...
note: cat[3293] exited with preempt_count 1
The bug was introduced by commit
91e86e560d0b3ce4c5fc64fd2bbb99f856a30a4e
("tracing: Fix recursive user stack trace")
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <
4D0089AC.
1020802@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>