futex: Move to kernel/futex/

In preparation for splitup..
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: André Almeida <andrealmeid@collabora.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: André Almeida <andrealmeid@collabora.com>
Link: https://lore.kernel.org/r/20210923171111.300673-2-andrealmeid@collabora.com

MAINTAINERS

@@ -7725,7 +7725,7 @@ F:	Documentation/locking/*futex*
 F:	include/asm-generic/futex.h
 F:	include/linux/futex.h
 F:	include/uapi/linux/futex.h
-F:	kernel/futex.c
+F:	kernel/futex/*
 F:	tools/perf/bench/futex*
 F:	tools/testing/selftests/futex/
 

kernel/Makefile

@@ -59,7 +59,7 @@ obj-$(CONFIG_FREEZER) += freezer.o
 obj-$(CONFIG_PROFILING) += profile.o
 obj-$(CONFIG_STACKTRACE) += stacktrace.o
 obj-y += time/
-obj-$(CONFIG_FUTEX) += futex.o
+obj-$(CONFIG_FUTEX) += futex/
 obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
 obj-$(CONFIG_SMP) += smp.o
 ifneq ($(CONFIG_SMP),y)

kernel/futex/Makefile

+# SPDX-License-Identifier: GPL-2.0
+
+obj-y += core.o

kernel/futex.c → kernel/futex/core.c

@@ -42,7 +42,7 @@
 
 #include <asm/futex.h>
 
-#include "locking/rtmutex_common.h"
+#include "../locking/rtmutex_common.h"
 
 /*
  * READ this before attempting to hack on futexes!