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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-03-03 16:15:39 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-03-24 20:51:49 -0400
commit42c269c88dc146982a54a8267f71abc99f12852a (patch)
tree2fecaaec16fe65febc290be5d67b396d0d0f75e3 /scripts
parentdbeafd0d6131d0f6ae8cd7551f5f4bf8c54aa49a (diff)
downloadlinux-42c269c88dc146982a54a8267f71abc99f12852a.tar.bz2
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>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/recordmcount.c1
-rwxr-xr-xscripts/recordmcount.pl1
2 files changed, 2 insertions, 0 deletions
diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
index aeb34223167c..16e086dcc567 100644
--- a/scripts/recordmcount.c
+++ b/scripts/recordmcount.c
@@ -412,6 +412,7 @@ static int
is_mcounted_section_name(char const *const txtname)
{
return strcmp(".text", txtname) == 0 ||
+ strcmp(".init.text", txtname) == 0 ||
strcmp(".ref.text", txtname) == 0 ||
strcmp(".sched.text", txtname) == 0 ||
strcmp(".spinlock.text", txtname) == 0 ||
diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index 0b6002b36f20..1633c3e6c0b9 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -130,6 +130,7 @@ if ($inputfile =~ m,kernel/trace/ftrace\.o$,) {
# Acceptable sections to record.
my %text_sections = (
".text" => 1,
+ ".init.text" => 1,
".ref.text" => 1,
".sched.text" => 1,
".spinlock.text" => 1,