sched/headers: Introduce kernel/sched/build_utility.c and build multiple .c files there

Collect all utility functionality source code files into a single kernel/sched/build_utility.c file,
via #include-ing the .c files:

    kernel/sched/clock.c
    kernel/sched/completion.c
    kernel/sched/loadavg.c
    kernel/sched/swait.c
    kernel/sched/wait_bit.c
    kernel/sched/wait.c

CONFIG_CPU_FREQ:
    kernel/sched/cpufreq.c

CONFIG_CPU_FREQ_GOV_SCHEDUTIL:
    kernel/sched/cpufreq_schedutil.c

CONFIG_CGROUP_CPUACCT:
    kernel/sched/cpuacct.c

CONFIG_SCHED_DEBUG:
    kernel/sched/debug.c

CONFIG_SCHEDSTATS:
    kernel/sched/stats.c

CONFIG_SMP:
   kernel/sched/cpupri.c
   kernel/sched/stop_task.c
   kernel/sched/topology.c

CONFIG_SCHED_CORE:
   kernel/sched/core_sched.c

CONFIG_PSI:
   kernel/sched/psi.c

CONFIG_MEMBARRIER:
   kernel/sched/membarrier.c

CONFIG_CPU_ISOLATION:
   kernel/sched/isolation.c

CONFIG_SCHED_AUTOGROUP:
   kernel/sched/autogroup.c

The goal is to amortize the 60+ KLOC header bloat from over a dozen build units into
a single build unit.

The build time of build_utility.c also roughly matches the build time of core.c and
fair.c - allowing better load-balancing of scheduler-only rebuilds.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Peter Zijlstra <peterz@infradead.org>

1 files changed, 55 insertions, 2 deletions

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index eab4a18f71c2..79c7a8a2be65 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -6,7 +6,25 @@
 #define _KERNEL_SCHED_SCHED_H
 
 #include <linux/sched.h>
+#include <linux/cpumask.h>
+#include <linux/ktime_api.h>
+#include <linux/cgroup_api.h>
+#include <linux/topology.h>
+#include <linux/prctl.h>
+#include <linux/ptrace_api.h>
+#include <linux/gfp_api.h>
+#include <linux/sched/clock.h>
+#include <linux/workqueue_api.h>
+#include <linux/tick.h>
+#include <linux/ktime_api.h>
+#include <linux/swait_api.h>
+#include <linux/hashtable_api.h>
+#include <linux/cpufreq.h>
+#include <linux/utsname.h>
 
+#include <asm/irq_regs.h>
+
+#include <linux/sched/affinity.h>
 #include <linux/sched/autogroup.h>
 #include <linux/sched/clock.h>
 #include <linux/sched/coredump.h>
@@ -24,6 +42,7 @@
 #include <linux/sched/nohz.h>
 #include <linux/sched/numa_balancing.h>
 #include <linux/sched/prio.h>
+#include <linux/sched/rseq_api.h>
 #include <linux/sched/rt.h>
 #include <linux/sched/signal.h>
 #include <linux/sched/smt.h>
@@ -31,6 +50,7 @@
 #include <linux/sched/sysctl.h>
 #include <linux/sched/task.h>
 #include <linux/sched/task_stack.h>
+#include <linux/sched/thread_info_api.h>
 #include <linux/sched/topology.h>
 #include <linux/sched/user.h>
 #include <linux/sched/wake_q.h>
@@ -69,8 +89,7 @@
 #include <linux/syscalls.h>
 #include <linux/task_work.h>
 #include <linux/tsacct_kern.h>
-
-#include <asm/tlb.h>
+#include <linux/hrtimer_api.h>
 
 #ifdef CONFIG_PARAVIRT
 # include <asm/paravirt.h>
@@ -87,6 +106,40 @@
 # define SCHED_WARN_ON(x)	({ (void)(x), 0; })
 #endif
 
+#include <linux/bitmap.h>
+#include <linux/capability.h>
+#include <linux/cgroup.h>
+#include <linux/cpufreq.h>
+#include <linux/cpumask_api.h>
+#include <linux/ctype.h>
+#include <linux/file.h>
+#include <linux/jiffies.h>
+#include <linux/kref_api.h>
+#include <linux/lockdep_api.h>
+#include <linux/module.h>
+#include <linux/mutex_api.h>
+#include <linux/poll.h>
+#include <linux/proc_fs.h>
+#include <linux/psi.h>
+#include <linux/sched/affinity.h>
+#include <linux/sched.h>
+#include <linux/sched/loadavg.h>
+#include <linux/sched/mm.h>
+#include <linux/sched/rseq_api.h>
+#include <linux/seq_file.h>
+#include <linux/seqlock.h>
+#include <linux/syscalls_api.h>
+#include <linux/syscalls.h>
+#include <linux/topology.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/wait_api.h>
+#include <linux/workqueue_api.h>
+
+#include <trace/events/power.h>
+
+#include "../workqueue_internal.h"
+
 struct rq;
 struct cpuidle_state;