Re: [PATCH] kunit/kunit_kernel: Rebuild .config if .kunitconfig is modified

On Sat, Jan 25, 2020 at 5:59 PM sj38.park@gmail.com wrote:

From: SeongJae Park sjpark@amazon.de

Deletions of configs in the '.kunitconfig' is not applied because kunit rebuilds '.config' only if the '.config' is not a subset of the '.kunitconfig'. To allow the deletions to applied, this commit modifies the '.config' rebuild condition to addtionally check the modified times of those files.

The reason it only checks that .kunitconfig is a subset of .config is because we don't want the .kunitconfig to remove options just because it doesn't recognize them.

It runs `make ARCH=um olddefconfig` on the .config that it generates from the .kunitconfig, and most of the time that means you will get a .config with lots of things in it that aren't in the .kunitconfig. Consequently, nothing should ever be deleted from the .config just because it was deleted in the .kunitconfig (unless, of course, you change a =y to a =n or # ... is not set), so I don't see what this change would do.

Can you maybe provide an example?

Signed-off-by: SeongJae Park sjpark@amazon.de

tools/testing/kunit/kunit_kernel.py | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/tools/testing/kunit/kunit_kernel.py b/tools/testing/kunit/kunit_kernel.py index cc5d844ecca1..a3a5d6c7e66d 100644 --- a/tools/testing/kunit/kunit_kernel.py +++ b/tools/testing/kunit/kunit_kernel.py @@ -111,17 +111,22 @@ class LinuxSourceTree(object): return True

    def build_reconfig(self, build_dir):

•           """Creates a new .config if it is not a subset of the .kunitconfig."""
  

•           """Creates a new .config if it is not a subset of, or older than the .kunitconfig."""
            kconfig_path = get_kconfig_path(build_dir)
            if os.path.exists(kconfig_path):
                    existing_kconfig = kunit_config.Kconfig()
                    existing_kconfig.read_from_file(kconfig_path)
  

•                   if not self._kconfig.is_subset_of(existing_kconfig):
  

•                           print('Regenerating .config ...')
  

•                           os.remove(kconfig_path)
  

•                           return self.build_config(build_dir)
  

•                   else:
  

•                   subset = self._kconfig.is_subset_of(existing_kconfig)
  

•                   kunitconfig_mtime = os.path.getmtime(kunitconfig_path)
  

•                   kconfig_mtime = os.path.getmtime(kconfig_path)
  

•                   older = kconfig_mtime < kunitconfig_mtime
  

•                   if subset and not older:
                            return True
  

•                   print('Regenerating .config ...')
  

•                   os.remove(kconfig_path)
  

•                   return self.build_config(build_dir)
            else:
                    print('Generating .config ...')
                    return self.build_config(build_dir)
  

-- 2.17.1