[V2]Reduce the compile time,by doing Multithreaded compilation

Making use of built in functions to compile

Signed-off-by: vrbagalkot <[email protected]>

Author: vrbagalkot

kernel/kselftest.py

@@ -131,10 +131,10 @@ def setUp(self):
 
                 self.sourcedir = os.path.join(self.buldir, self.testdir)
                 if (self.comp != "cpufreq" and self.comp != "bpf"):
-                    process.system("make headers -C %s" % self.buldir, shell=True,
-                                   sudo=True)
-                    process.system("make install -C %s" % self.sourcedir,
-                                   shell=True, sudo=True)
+                    build.make(path =self.buldir, make="make",
+                               extra_args=f" headers -C {self.buldir}")
+                    build.make(path=self.sourcedir, make="make",
+                               extra_args=f" install -C {self.sourcedir}")
             else:
                 self.buldir = self.params.get('location', default='')
         else:
@@ -178,7 +178,7 @@ def setUp(self):
         if (self.comp != "cpufreq" and self.comp != "bpf"):
             if self.comp:
                 build_str = '-C %s' % self.comp
-            if build.make(self.sourcedir, extra_args='%s' % build_str):
+            if build.make(path=self.sourcedir, extra_args=f" {build_str}"):
                 self.fail("Compilation failed, Please check the build logs !!")
 
     def test(self):
@@ -199,9 +199,8 @@ def test(self):
                     test_comp = self.comp + "/" + self.subtest
                 else:
                     test_comp = self.comp
-                make_cmd = 'make -C %s %s -C %s run_tests' % (
-                    self.sourcedir, kself_args, test_comp)
-                self.result = process.run(make_cmd, shell=True, ignore_status=True)
+                args = '-C %s %s -C %s run_tests'%(self.sourcedir, kself_args, test_comp)
+                self.result = build.run_make(path=self.sourcedir, extra_args=f" {args}")
         log_output = self.result.stdout.decode('utf-8')
         results_path = os.path.join(self.outputdir, 'raw_output')
         with open(results_path, 'w') as r_file:
@@ -260,7 +259,6 @@ def bpf(self):
         """
         self.sourcedir = os.path.join(self.buldir, self.testdir)
         os.chdir(self.sourcedir)
-        build.make(self.sourcedir)
         build.make(self.sourcedir, extra_args='run_tests')
 
     def cpufreq(self):