ftrace: Allow for function tracing to record init functions on boot up
authorSteven Rostedt (VMware) <rostedt@goodmis.org>
Fri, 3 Mar 2017 21:15:39 +0000 (16:15 -0500)
committerSteven Rostedt (VMware) <rostedt@goodmis.org>
Sat, 25 Mar 2017 00:51:49 +0000 (20:51 -0400)
commit42c269c88dc146982a54a8267f71abc99f12852a
tree2fecaaec16fe65febc290be5d67b396d0d0f75e3
parentdbeafd0d6131d0f6ae8cd7551f5f4bf8c54aa49a
ftrace: Allow for function tracing to record init functions on boot up

Adding a hook into free_reserve_area() that informs ftrace that boot up init
text is being free, lets ftrace safely remove those init functions from its
records, which keeps ftrace from trying to modify text that no longer
exists.

Note, this still does not allow for tracing .init text of modules, as
modules require different work for freeing its init code.

Link: http://lkml.kernel.org/r/1488502497.7212.24.camel@linux.intel.com
Cc: linux-mm@kvack.org
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Requested-by: Todd Brandt <todd.e.brandt@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
include/linux/ftrace.h
include/linux/init.h
kernel/trace/ftrace.c
mm/page_alloc.c
scripts/recordmcount.c
scripts/recordmcount.pl