[PATCH 6/9] ktest: Add BISECT_FILES to run git bisect on paths

[Steven Rostedt <rostedt@goodmis.org>]

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From: Steven Rostedt <srostedt@redhat.com>

Add the config option BISECT_FILES that allows the user to
specify what path in the kernel to run the git bisect on.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 tools/testing/ktest/ktest.pl    |    9 ++++++++-
 tools/testing/ktest/sample.conf |    9 +++++++++
 2 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index 0f62916..65c5c55 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -1280,6 +1280,13 @@ sub bisect {
     my $type = $opt{"BISECT_TYPE[$i]"};
     my $start = $opt{"BISECT_START[$i]"};
     my $replay = $opt{"BISECT_REPLAY[$i]"};
+    my $start_files = $opt{"BISECT_FILES[$i]"};
+
+    if (defined($start_files)) {
+	$start_files = " -- " . $start_files;
+    } else {
+	$start_files = "";
+    }
 
     # convert to true sha1's
     $good = get_sha1($good);
@@ -1333,7 +1340,7 @@ sub bisect {
 	    die "Failed to checkout $head";
     }
 
-    run_command "git bisect start" or
+    run_command "git bisect start$start_files" or
 	dodie "could not start bisect";
 
     run_command "git bisect good $good" or
diff --git a/tools/testing/ktest/sample.conf b/tools/testing/ktest/sample.conf
index 4c46b7e..4c83ae7 100644
--- a/tools/testing/ktest/sample.conf
+++ b/tools/testing/ktest/sample.conf
@@ -528,6 +528,15 @@
 #   when something other than the BISECT_TYPE fails, ktest.pl will
 #   run "git bisect skip" and try again.
 #
+# BISECT_FILES = <path> (optional, default undefined)
+#
+#   To just run the git bisect on a specific path, set BISECT_FILES.
+#   For example:
+#
+#     BISECT_FILES = arch/x86 kernel/time
+#
+#   Will run the bisect with "git bisect start -- arch/x86 kernel/time"
+#
 # BISECT_REVERSE = 1 (optional, default 0)
 #
 #   In those strange instances where it was broken forever
-- 
1.7.2.3