root/Makefile

Revision 24, 35.9 kB (checked in by dkaplan1, 4 years ago)
Configured now for P4 test box Includes benchmark code for lcall/lret and int/iret Adds new ring=X argument to insmod to specify ring to be loaded into Fixes scheduling issue where driver thread not always picked first

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1	VERSION = 2
2	PATCHLEVEL = 6
3	SUBLEVEL = 7
4	EXTRAVERSION = -kgdb-ringcycle
5	NAME=Zonked Quokka
6
7	# DOCUMENTATION
8	# To see a list of typical targets execute "make help"
9	# More info can be located in ./README
10	# Comments in this file are targeted only to the developer, do not
11	# expect to learn how to build the kernel reading this file.
12
13	# Do not print "Entering directory ..."
14	MAKEFLAGS += --no-print-directory
15
16	# We are using a recursive build, so we need to do a little thinking
17	# to get the ordering right.
18	#
19	# Most importantly: sub-Makefiles should only ever modify files in
20	# their own directory. If in some directory we have a dependency on
21	# a file in another dir (which doesn't happen often, but it's of
22	# unavoidable when linking the built-in.o targets which finally
23	# turn into vmlinux), we will call a sub make in that other dir, and
24	# after that we are sure that everything which is in that other dir
25	# is now up to date.
26	#
27	# The only cases where we need to modify files which have global
28	# effects are thus separated out and done before the recursive
29	# descending is started. They are now explicitly listed as the
30	# prepare rule.
31
32	# To put more focus on warnings, be less verbose as default
33	# Use 'make V=1' to see the full commands
34
35	ifdef V
36	ifeq ("$(origin V)", "command line")
37	KBUILD_VERBOSE = $(V)
38	endif
39	endif
40	ifndef KBUILD_VERBOSE
41	KBUILD_VERBOSE = 0
42	endif
43
44	# Call sparse as part of compilation of C files
45	# Use 'make C=1' to enable sparse checking
46
47	ifdef C
48	ifeq ("$(origin C)", "command line")
49	KBUILD_CHECKSRC = $(C)
50	endif
51	endif
52	ifndef KBUILD_CHECKSRC
53	KBUILD_CHECKSRC = 0
54	endif
55
56	# Use make M=dir to specify direcotry of external module to build
57	# Old syntax make ... SUBDIRS=$PWD is still supported
58	# Setting the environment variable KBUILD_EXTMOD take precedence
59	ifdef SUBDIRS
60	KBUILD_EXTMOD ?= $(SUBDIRS)
61	endif
62	ifdef M
63	ifeq ("$(origin M)", "command line")
64	KBUILD_EXTMOD := $(M)
65	endif
66	endif
67
68
69	# kbuild supports saving output files in a separate directory.
70	# To locate output files in a separate directory two syntax'es are supported.
71	# In both cases the working directory must be the root of the kernel src.
72	# 1) O=
73	# Use "make O=dir/to/store/output/files/"
74	#
75	# 2) Set KBUILD_OUTPUT
76	# Set the environment variable KBUILD_OUTPUT to point to the directory
77	# where the output files shall be placed.
78	# export KBUILD_OUTPUT=dir/to/store/output/files/
79	# make
80	#
81	# The O= assigment takes precedence over the KBUILD_OUTPUT environment variable.
82
83
84	# KBUILD_SRC is set on invocation of make in OBJ directory
85	# KBUILD_SRC is not intended to be used by the regular user (for now)
86	ifeq ($(KBUILD_SRC),)
87
88	# OK, Make called in directory where kernel src resides
89	# Do we want to locate output files in a separate directory?
90	ifdef O
91	ifeq ("$(origin O)", "command line")
92	KBUILD_OUTPUT := $(O)
93	endif
94	endif
95
96	# That's our default target when none is given on the command line
97	.PHONY: _all
98	_all:
99
100	ifneq ($(KBUILD_OUTPUT),)
101	# Invoke a second make in the output directory, passing relevant variables
102	# check that the output directory actually exists
103	saved-output := $(KBUILD_OUTPUT)
104	KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
105	$(if $(wildcard $(KBUILD_OUTPUT)),, \
106	$(error output directory "$(saved-output)" does not exist))
107
108	.PHONY: $(MAKECMDGOALS)
109
110	$(filter-out _all,$(MAKECMDGOALS)) _all:
111	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
112	KBUILD_SRC=$(CURDIR) KBUILD_VERBOSE=$(KBUILD_VERBOSE) \
113	KBUILD_CHECK=$(KBUILD_CHECK) KBUILD_EXTMOD="$(KBUILD_EXTMOD)" \
114	-f $(CURDIR)/Makefile $@
115
116	# Leave processing to above invocation of make
117	skip-makefile := 1
118	endif # ifneq ($(KBUILD_OUTPUT),)
119	endif # ifeq ($(KBUILD_SRC),)
120
121	# We process the rest of the Makefile if this is the final invocation of make
122	ifeq ($(skip-makefile),)
123
124	# If building an external module we do not care about the all: rule
125	# but instead _all depend on modules
126	.PHONY: all
127	ifeq ($(KBUILD_EXTMOD),)
128	_all: all
129	else
130	_all: modules
131	endif
132
133	# Make sure we're not wasting cpu-cycles doing locale handling, yet do make
134	# sure error messages appear in the user-desired language
135	ifdef LC_ALL
136	LANG := $(LC_ALL)
137	LC_ALL :=
138	endif
139	LC_COLLATE := C
140	LC_CTYPE := C
141	export LANG LC_ALL LC_COLLATE LC_CTYPE
142
143	srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
144	TOPDIR := $(srctree)
145	# FIXME - TOPDIR is obsolete, use srctree/objtree
146	objtree := $(CURDIR)
147	src := $(srctree)
148	obj := $(objtree)
149
150	VPATH := $(srctree)
151
152	export srctree objtree VPATH TOPDIR
153
154	KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
155
156	# SUBARCH tells the usermode build what the underlying arch is. That is set
157	# first, and if a usermode build is happening, the "ARCH=um" on the command
158	# line overrides the setting of ARCH below. If a native build is happening,
159	# then ARCH is assigned, getting whatever value it gets normally, and
160	# SUBARCH is subsequently ignored.
161
162	SUBARCH := $(shell uname -m \| sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
163	*-e s/arm./arm/ -e s/sa110/arm/ \**
164	-e s/s390x/s390/ -e s/parisc64/parisc/ )
165
166	# Cross compiling and selecting different set of gcc/bin-utils
167	# ---------------------------------------------------------------------------
168	#
169	# When performing cross compilation for other architectures ARCH shall be set
170	# to the target architecture. (See arch/ for the possibilities).*
171	# ARCH can be set during invocation of make:
172	# make ARCH=ia64
173	# Another way is to have ARCH set in the environment.
174	# The default ARCH is the host where make is executed.
175
176	# CROSS_COMPILE specify the prefix used for all executables used
177	# during compilation. Only gcc and related bin-utils executables
178	# are prefixed with $(CROSS_COMPILE).
179	# CROSS_COMPILE can be set on the command line
180	# make CROSS_COMPILE=ia64-linux-
181	# Alternatively CROSS_COMPILE can be set in the environment.
182	# Default value for CROSS_COMPILE is not to prefix executables
183	# Note: Some architectures assign CROSS_COMPILE in their arch//Makefile*
184
185	ARCH ?= $(SUBARCH)
186	CROSS_COMPILE ?=
187
188	# Architecture as present in compile.h
189	UTS_MACHINE := $(ARCH)
190
191	# SHELL used by kbuild
192	CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
193	else if [ -x /bin/bash ]; then echo /bin/bash; \
194	else echo sh; fi ; fi)
195
196	#HOSTCC = gcc-3.3
197	HOSTCC = gcc32
198	HOSTCXX = g++-3.3
199	HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
200	HOSTCXXFLAGS = -O2
201
202	# Decide whether to build built-in, modular, or both.
203	# Normally, just do built-in.
204
205	KBUILD_MODULES :=
206	KBUILD_BUILTIN := 1
207
208	# If we have only "make modules", don't compile built-in objects.
209	# When we're building modules with modversions, we need to consider
210	# the built-in objects during the descend as well, in order to
211	# make sure the checksums are uptodate before we record them.
212
213	ifeq ($(MAKECMDGOALS),modules)
214	KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
215	endif
216
217	# If we have "make <whatever> modules", compile modules
218	# in addition to whatever we do anyway.
219	# Just "make" or "make all" shall build modules as well
220
221	ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
222	KBUILD_MODULES := 1
223	endif
224
225	ifeq ($(MAKECMDGOALS),)
226	KBUILD_MODULES := 1
227	endif
228
229	export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
230	export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
231
232	# Beautify output
233	# ---------------------------------------------------------------------------
234	#
235	# Normally, we echo the whole command before executing it. By making
236	# that echo $($(quiet)$(cmd)), we now have the possibility to set
237	# $(quiet) to choose other forms of output instead, e.g.
238	#
239	# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
240	# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
241	#
242	# If $(quiet) is empty, the whole command will be printed.
243	# If it is set to "quiet_", only the short version will be printed.
244	# If it is set to "silent_", nothing wil be printed at all, since
245	# the variable $(silent_cmd_cc_o_c) doesn't exist.
246	#
247	# A simple variant is to prefix commands with $(Q) - that's usefull
248	# for commands that shall be hidden in non-verbose mode.
249	#
250	# $(Q)ln $@ :<
251	#
252	# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
253	# If KBUILD_VERBOSE equals 1 then the above command is displayed.
254
255	ifeq ($(KBUILD_VERBOSE),1)
256	quiet =
257	Q =
258	else
259	quiet=quiet_
260	Q = @
261	endif
262
263	# If the user is running make -s (silent mode), suppress echoing of
264	# commands
265
266	ifneq ($(findstring s,$(MAKEFLAGS)),)
267	quiet=silent_
268	endif
269
270	check_gcc = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
271
272	export quiet Q KBUILD_VERBOSE check_gcc
273
274	# Look for make include files relative to root of kernel src
275	MAKEFLAGS += --include-dir=$(srctree)
276
277	# For maximum performance (+ possibly random breakage, uncomment
278	# the following)
279
280	#MAKEFLAGS += -rR
281
282	# Make variables (CC, etc...)
283
284	AS = $(CROSS_COMPILE)as
285	LD = $(CROSS_COMPILE)ld
286	CC = $(CROSS_COMPILE)gcc32
287	CPP = $(CC) -E
288	AR = $(CROSS_COMPILE)ar
289	NM = $(CROSS_COMPILE)nm
290	STRIP = $(CROSS_COMPILE)strip
291	OBJCOPY = $(CROSS_COMPILE)objcopy
292	OBJDUMP = $(CROSS_COMPILE)objdump
293	AWK = awk
294	RPM := $(shell if [ -x "/usr/bin/rpmbuild" ]; then echo rpmbuild; \
295	else echo rpm; fi)
296	GENKSYMS = scripts/genksyms/genksyms
297	DEPMOD = /sbin/depmod
298	KALLSYMS = scripts/kallsyms
299	PERL = perl
300	CHECK = sparse
301	MODFLAGS = -DMODULE
302	CFLAGS_MODULE = $(MODFLAGS)
303	AFLAGS_MODULE = $(MODFLAGS)
304	LDFLAGS_MODULE = -r
305	CFLAGS_KERNEL =
306	AFLAGS_KERNEL =
307
308	NOSTDINC_FLAGS = -nostdinc -iwithprefix include
309
310	CPPFLAGS := -D__KERNEL__ -Iinclude \
311	$(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
312
313	CFLAGS := -Wall -Wstrict-prototypes -Wno-trigraphs \
314	-fno-strict-aliasing -fno-common
315	AFLAGS := -D__ASSEMBLY__
316
317	export VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
318	CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
319	CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
320	HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB LDFLAGS_MODULE CHECK
321
322	export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFLAGS LDFLAGS
323	export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
324	export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
325
326	# When compiling out-of-tree modules, put MODVERDIR in the module
327	# tree rather than in the kernel tree. The kernel tree might
328	# even be read-only.
329	export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
330
331	# The temporary file to save gcc -MD generated dependencies must not
332	# contain a comma
333	comma := ,
334	depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
335
336	# Files to ignore in find ... statements
337
338	RCS_FIND_IGNORE := $ -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS $ -prune -o
339	RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS
340
341	# ===========================================================================
342	# Rules shared between config targets and build targets*
343
344	# Basic helpers built in scripts/
345	.PHONY: scripts_basic
346	scripts_basic:
347	$(Q)$(MAKE) $(build)=scripts/basic
348
349	# To make sure we do not include .config for any of the config targets*
350	# catch them early, and hand them over to scripts/kconfig/Makefile
351	# It is allowed to specify more targets when calling make, including
352	# mixing config targets and build targets.*
353	# For example 'make oldconfig all'.
354	# Detect when mixed targets is specified, and make a second invocation
355	# of make so .config is not included in this case either (for config).*
356
357	no-dot-config-targets := clean mrproper distclean \
358	cscope TAGS tags help %docs check%
359
360	config-targets := 0
361	mixed-targets := 0
362	dot-config := 1
363
364	ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
365	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
366	dot-config := 0
367	endif
368	endif
369
370	ifeq ($(KBUILD_EXTMOD),)
371	ifneq ($(filter config %config,$(MAKECMDGOALS)),)
372	config-targets := 1
373	ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
374	mixed-targets := 1
375	endif
376	endif
377	endif
378
379	ifeq ($(mixed-targets),1)
380	# ===========================================================================
381	# We're called with mixed targets (config and build targets).*
382	# Handle them one by one.
383
384	%:: FORCE
385	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
386
387	else
388	ifeq ($(config-targets),1)
389	# ===========================================================================
390	# config targets only - make sure prerequisites are updated, and descend*
391	# in scripts/kconfig to make the config target*
392
393	config: scripts_basic FORCE
394	$(Q)$(MAKE) $(build)=scripts/kconfig $@
395	%config: scripts_basic FORCE
396	$(Q)$(MAKE) $(build)=scripts/kconfig $@
397
398	else
399	# ===========================================================================
400	# Build targets only - this includes vmlinux, arch specific targets, clean
401	# targets and others. In general all targets except config targets.*
402
403	ifeq ($(KBUILD_EXTMOD),)
404
405
406	# Additional helpers built in scripts/
407	# Carefully list dependencies so we do not try to build scripts twice
408	# in parrallel
409	.PHONY: scripts
410	scripts: scripts_basic include/config/MARKER
411	$(Q)$(MAKE) $(build)=$(@)
412
413	scripts_basic: include/linux/autoconf.h
414
415
416	# That's our default target when none is given on the command line
417	# Note that 'modules' will be added as a prerequisite as well,
418	# in the CONFIG_MODULES part below
419
420	all: vmlinux
421
422	# Objects we will link into vmlinux / subdirs we need to visit
423	init-y := init/
424	drivers-y := drivers/ sound/
425	net-y := net/
426	libs-y := lib/
427	core-y := usr/
428	endif # KBUILD_EXTMOD
429
430	ifeq ($(dot-config),1)
431	# In this section, we need .config
432
433	# Read in dependencies to all Kconfig files, make sure to run*
434	# oldconfig if changes are detected.
435	-include .config.cmd
436
437	include .config
438
439	# If .config needs to be updated, it will be done via the dependency
440	# that autoconf has on .config.
441	# To avoid any implicit rule to kick in, define an empty command
442	.config: ;
443
444	# If .config is newer than include/linux/autoconf.h, someone tinkered
445	# with it and forgot to run make oldconfig
446	include/linux/autoconf.h: .config
447	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
448	else
449	# Dummy target needed, because used as prerequisite
450	include/linux/autoconf.h: ;
451	endif
452
453	include $(srctree)/arch/$(ARCH)/Makefile
454
455	ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
456	CFLAGS += -Os
457	else
458	CFLAGS += -O2
459	endif
460
461	ifndef CONFIG_FRAME_POINTER
462	CFLAGS += -fomit-frame-pointer
463	else
464	CFLAGS += -fno-omit-frame-pointer
465	endif
466
467	ifdef CONFIG_DEBUG_INFO
468	CFLAGS += -g
469	endif
470
471	# warn about C99 declaration after statement
472	CFLAGS += $(call check_gcc,-Wdeclaration-after-statement,)
473
474	#
475	# INSTALL_PATH specifies where to place the updated kernel and system map
476	# images. Uncomment if you want to place them anywhere other than root.
477	#
478
479	#export INSTALL_PATH=/boot
480
481	#
482	# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
483	# relocations required by build roots. This is not defined in the
484	# makefile but the arguement can be passed to make if needed.
485	#
486
487	MODLIB := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
488	export MODLIB
489
490
491	ifeq ($(KBUILD_EXTMOD),)
492	core-y += kernel/ mm/ fs/ ipc/ security/ crypto/
493
494	vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
495	$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
496	$(net-y) $(net-m) $(libs-y) $(libs-m)))
497
498	vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
499	$(init-n) $(init-) \
500	$(core-n) $(core-) $(drivers-n) $(drivers-) \
501	$(net-n) $(net-) $(libs-n) $(libs-))))
502
503	init-y := $(patsubst %/, %/built-in.o, $(init-y))
504	core-y := $(patsubst %/, %/built-in.o, $(core-y))
505	drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
506	net-y := $(patsubst %/, %/built-in.o, $(net-y))
507	libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
508	libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
509	libs-y := $(libs-y1) $(libs-y2)
510
511
512	# Build vmlinux
513	# ---------------------------------------------------------------------------
514
515	# This is a bit tricky: If we need to relink vmlinux, we want
516	# the version number incremented, which means recompile init/version.o
517	# and relink init/init.o. However, we cannot do this during the
518	# normal descending-into-subdirs phase, since at that time
519	# we cannot yet know if we will need to relink vmlinux.
520	# So we descend into init/ inside the rule for vmlinux again.
521	head-y += $(HEAD)
522	vmlinux-objs := $(head-y) $(init-y) $(core-y) $(libs-y) $(drivers-y) $(net-y)
523
524	quiet_cmd_vmlinux__ = LD $@
525	define cmd_vmlinux__
526	$(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) $(head-y) $(init-y) \
527	--start-group \
528	$(core-y) \
529	$(libs-y) \
530	$(drivers-y) \
531	$(net-y) \
532	--end-group \
533	$(filter .tmp_kallsyms%,$^) \
534	-o $@
535	endef
536
537	# set -e makes the rule exit immediately on error
538
539	define rule_vmlinux__
540	+set -e; \
541	$(if $(filter .tmp_kallsyms%,$^),, \
542	echo ' GEN .version'; \
543	. $(srctree)/scripts/mkversion > .tmp_version; \
544	mv -f .tmp_version .version; \
545	$(MAKE) $(build)=init; \
546	) \
547	$(if $($(quiet)cmd_vmlinux__), \
548	echo ' $($(quiet)cmd_vmlinux__)' &&) \
549	$(cmd_vmlinux__); \
550	echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
551	endef
552
553	define rule_vmlinux
554	$(rule_vmlinux__); \
555	$(NM) $@ \| grep -v '$compiled$\\|$\.o$$$\\|$ [aUw] $\\|$\.\.ng$$$\\|$LASH[RL]DI$' \| sort > System.map
556	endef
557
558	LDFLAGS_vmlinux += -T arch/$(ARCH)/kernel/vmlinux.lds.s
559
560	# Generate section listing all symbols and add it into vmlinux
561	# It's a three stage process:
562	# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
563	# empty
564	# Running kallsyms on that gives us .tmp_kallsyms1.o with
565	# the right size
566	# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
567	# but due to the added section, some addresses have shifted
568	# From here, we generate a correct .tmp_kallsyms2.o
569	# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
570
571	ifdef CONFIG_KALLSYMS
572
573	kallsyms.o := .tmp_kallsyms2.o
574
575	quiet_cmd_kallsyms = KSYM $@
576	cmd_kallsyms = $(NM) -n $< \| $(KALLSYMS) $(foreach x,$(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
577
578	.tmp_kallsyms1.o .tmp_kallsyms2.o: %.o: %.S scripts FORCE
579	$(call if_changed_dep,as_o_S)
580
581	.tmp_kallsyms%.S: .tmp_vmlinux%
582	$(call cmd,kallsyms)
583
584	.tmp_vmlinux1: $(vmlinux-objs) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
585	+$(call if_changed_rule,vmlinux__)
586
587	.tmp_vmlinux2: $(vmlinux-objs) .tmp_kallsyms1.o arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
588	$(call if_changed_rule,vmlinux__)
589
590	endif
591
592	# Finally the vmlinux rule
593
594	vmlinux: $(vmlinux-objs) $(kallsyms.o) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
595	$(call if_changed_rule,vmlinux)
596
597	# The actual objects are generated when descending,
598	# make sure no implicit rule kicks in
599
600	$(sort $(vmlinux-objs)) arch/$(ARCH)/kernel/vmlinux.lds.s: $(vmlinux-dirs) ;
601
602	# Handle descending into subdirectories listed in $(vmlinux-dirs)
603
604	.PHONY: $(vmlinux-dirs)
605	$(vmlinux-dirs): prepare-all scripts
606	$(Q)$(MAKE) $(build)=$@
607
608	# Things we need to do before we recursively start building the kernel
609	# or the modules are listed in "prepare-all".
610	# A multi level approach is used. prepare1 is updated first, then prepare0.
611	# prepare-all is the collection point for the prepare targets.
612
613	.PHONY: prepare-all prepare prepare0 prepare1
614
615	# prepare1 is used to check if we are building in a separate output directory,
616	# and if so do:
617	# 1) Check that make has not been executed in the kernel src $(srctree)
618	# 2) Create the include2 directory, used for the second asm symlink
619
620	prepare1:
621	ifneq ($(KBUILD_SRC),)
622	@echo ' Using $(srctree) as source for kernel'
623	$(Q)if [ -h $(srctree)/include/asm -o -f $(srctree)/.config ]; then \
624	echo " $(srctree) is not clean, please run 'make mrproper'";\
625	echo " in the '$(srctree)' directory.";\
626	/bin/false; \
627	fi;
628	$(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
629	$(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
630	endif
631
632	prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
633	ifneq ($(KBUILD_MODULES),)
634	$(Q)rm -rf $(MODVERDIR)
635	$(Q)mkdir -p $(MODVERDIR)
636	endif
637
638	# All the preparing..
639	prepare-all: prepare0 prepare
640
641	# Leave this as default for preprocessing vmlinux.lds.S, which is now
642	# done in arch/$(ARCH)/kernel/Makefile
643
644	export AFLAGS_vmlinux.lds.o += -P -C -U$(ARCH)
645
646	# Single targets
647	# ---------------------------------------------------------------------------
648
649	%.s: %.c scripts FORCE
650	$(Q)$(MAKE) $(build)=$(@D) $@
651	%.i: %.c scripts FORCE
652	$(Q)$(MAKE) $(build)=$(@D) $@
653	%.o: %.c scripts FORCE
654	$(Q)$(MAKE) $(build)=$(@D) $@
655	%/: scripts prepare FORCE
656	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
657	%.lst: %.c scripts FORCE
658	$(Q)$(MAKE) $(build)=$(@D) $@
659	%.s: %.S scripts FORCE
660	$(Q)$(MAKE) $(build)=$(@D) $@
661	%.o: %.S scripts FORCE
662	$(Q)$(MAKE) $(build)=$(@D) $@
663
664	# FIXME: The asm symlink changes when $(ARCH) changes. That's
665	# hard to detect, but I suppose "make mrproper" is a good idea
666	# before switching between archs anyway.
667
668	include/asm:
669	@echo ' SYMLINK $@ -> include/asm-$(ARCH)'
670	$(Q)if [ ! -d include ]; then mkdir -p include; fi;
671	@ln -fsn asm-$(ARCH) $@
672
673	# Split autoconf.h into include/linux/config/*
674
675	include/config/MARKER: include/linux/autoconf.h
676	@echo ' SPLIT include/linux/autoconf.h -> include/config/*'
677	@scripts/basic/split-include include/linux/autoconf.h include/config
678	@touch $@
679
680	# Generate some files
681	# ---------------------------------------------------------------------------
682
683	# version.h changes when $(KERNELRELEASE) etc change, as defined in
684	# this Makefile
685
686	uts_len := 64
687
688	define filechk_version.h
689	if [ `echo -n "$(KERNELRELEASE)" \| wc -c ` -gt $(uts_len) ]; then \
690	echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
691	exit 1; \
692	fi; \
693	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
694	echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\ 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \*
695	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
696	)
697	endef
698
699	include/linux/version.h: Makefile
700	$(call filechk,version.h)
701
702	# ---------------------------------------------------------------------------
703
704	.PHONY: depend dep
705	depend dep:
706	@echo '*** Warning: make $@ is unnecessary now.'
707
708	# ---------------------------------------------------------------------------
709	# Modules
710
711	ifdef CONFIG_MODULES
712
713	# By default, build modules as well
714
715	all: modules
716
717	# Build modules
718
719	.PHONY: modules
720	modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
721	@echo ' Building modules, stage 2.';
722	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
723
724
725	# Target to prepare building external modules
726	.PHONY: modules_prepare
727	modules_prepare: prepare-all scripts
728
729	# Target to install modules
730	.PHONY: modules_install
731	modules_install: _modinst_ _modinst_post
732
733	.PHONY: _modinst_
734	_modinst_:
735	@if [ -z "`$(DEPMOD) -V \| grep module-init-tools`" ]; then \
736	echo "Warning: you may need to install module-init-tools"; \
737	echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
738	sleep 1; \
739	fi
740	@rm -rf $(MODLIB)/kernel
741	@rm -f $(MODLIB)/build
742	@mkdir -p $(MODLIB)/kernel
743	@ln -s $(TOPDIR) $(MODLIB)/build
744	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
745
746	# If System.map exists, run depmod. This deliberately does not have a
747	# dependency on System.map since that would run the dependency tree on
748	# vmlinux. This depmod is only for convenience to give the initial
749	# boot a modules.dep even before / is mounted read-write. However the
750	# boot script depmod is the master version.
751	ifeq "$(strip $(INSTALL_MOD_PATH))" ""
752	depmod_opts :=
753	else
754	depmod_opts := -b $(INSTALL_MOD_PATH) -r
755	endif
756	.PHONY: _modinst_post
757	_modinst_post: _modinst_
758	if [ -r System.map ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
759
760	else # CONFIG_MODULES
761
762	# Modules not configured
763	# ---------------------------------------------------------------------------
764
765	modules modules_install: FORCE
766	@echo
767	@echo "The present kernel configuration has modules disabled."
768	@echo "Type 'make config' and enable loadable module support."
769	@echo "Then build a kernel with module support enabled."
770	@echo
771	@exit 1
772
773	endif # CONFIG_MODULES
774
775	# Generate asm-offsets.h
776	# ---------------------------------------------------------------------------
777
778	define filechk_gen-asm-offsets
779	(set -e; \
780	echo "#ifndef __ASM_OFFSETS_H__"; \
781	echo "#define __ASM_OFFSETS_H__"; \
782	echo *"/"**; \
783	echo *" DO NOT MODIFY."**; \
784	echo *" "**; \
785	echo *" This file was generated by arch/$(ARCH)/Makefile"**; \
786	echo *" "**; \
787	echo *" /"**; \
788	echo ""; \
789	sed -ne *"/^->/{s:^->$[^ ]$ [\$$#]$[^ ]$ $.$:#define \1 \2 / \3 /:; s:->::; p;}"*; \
790	echo ""; \
791	echo "#endif" )
792	endef
793
794
795	###
796	# Cleaning is done on three levels.
797	# make clean Delete most generated files
798	# Leave enough to build external modules
799	# make mrproper Delete the current configuration, and all generated files
800	# make distclean Remove editor backup files, patch leftover files and the like
801
802	# Directories & files removed with 'make clean'
803	CLEAN_DIRS += $(MODVERDIR)
804	CLEAN_FILES += vmlinux System.map kernel.spec \
805	.tmp_kallsyms* .tmp_version .tmp_vmlinux*
806
807	# Directories & files removed with 'make mrproper'
808	MRPROPER_DIRS += include/config include2
809	MRPROPER_FILES += .config .config.old include/asm .version \
810	include/linux/autoconf.h include/linux/version.h \
811	Module.symvers tags TAGS cscope*
812
813	# clean - Delete most, but leave enough to build external modules
814	#
815	clean: rm-dirs := $(CLEAN_DIRS)
816	clean: rm-files := $(CLEAN_FILES)
817	clean-dirs := $(addprefix _clean_,$(vmlinux-alldirs))
818
819	.PHONY: $(clean-dirs) clean archclean
820	$(clean-dirs):
821	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
822
823	clean: archclean $(clean-dirs)
824	$(call cmd,rmdirs)
825	$(call cmd,rmfiles)
826	@find . $(RCS_FIND_IGNORE) \
827	\( -name '.[oas]' -o -name '.ko' -o -name '.*.cmd' \
828	-o -name '..d' -o -name '..tmp' -o -name '*.mod.c' \) \
829	-type f -print \| xargs rm -f
830
831	# mrproper - Delete all generated files, including .config
832	#
833	mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
834	mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
835	mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
836
837	.PHONY: $(mrproper-dirs) mrproper archmrproper
838	$(mrproper-dirs):
839	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
840
841	mrproper: clean archmrproper $(mrproper-dirs)
842	$(call cmd,rmdirs)
843	$(call cmd,rmfiles)
844
845	# distclean
846	#
847	.PHONY: distclean
848
849	distclean: mrproper
850	@find . $(RCS_FIND_IGNORE) \
851	\( -name '.orig' -o -name '.rej' -o -name '*~' \
852	-o -name '.bak' -o -name '##' -o -name '..orig' \*
853	-o -name '.*.rej' -o -size 0 \
854	-o -name '%' -o -name '..cmd' -o -name 'core' \) \
855	-type f -print \| xargs rm -f
856
857	# RPM target
858	# ---------------------------------------------------------------------------
859
860	.PHONY: rpm
861
862	# Remove hyphens since they have special meaning in RPM filenames
863	KERNELPATH=kernel-$(subst -,,$(KERNELRELEASE))
864
865	# If you do a make spec before packing the tarball you can rpm -ta it
866
867	spec:
868	$(CONFIG_SHELL) $(srctree)/scripts/mkspec > $(objtree)/kernel.spec
869
870	# a) Build a tar ball
871	# b) generate an rpm from it
872	# c) and pack the result
873	# - Use /. to avoid tar packing just the symlink
874
875	rpm: clean spec
876	set -e; \
877	cd .. ; \
878	ln -sf $(srctree) $(KERNELPATH) ; \
879	tar -cvz $(RCS_TAR_IGNORE) -f $(KERNELPATH).tar.gz $(KERNELPATH)/. ; \
880	rm $(KERNELPATH)
881
882	set -e; \
883	$(CONFIG_SHELL) $(srctree)/scripts/mkversion > $(objtree)/.tmp_version;\
884	mv -f $(objtree)/.tmp_version $(objtree)/.version;
885
886	$(RPM) --target $(UTS_MACHINE) -ta ../$(KERNELPATH).tar.gz
887	rm ../$(KERNELPATH).tar.gz
888
889	# Brief documentation of the typical targets used
890	# ---------------------------------------------------------------------------
891
892	boards := $(*wildcard $(srctree)/arch/$(ARCH)/configs/_defconfig**)
893	boards := $(notdir $(boards))
894
895	help:
896	@echo 'Cleaning targets:'
897	@echo ' clean - remove most generated files but keep the config'
898	@echo ' mrproper - remove all generated files + config + various backup files'
899	@echo ''
900	@echo 'Configuration targets:'
901	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
902	@echo ''
903	@echo 'Other generic targets:'
904	@echo ' all - Build all targets marked with [*]'
905	@echo '* vmlinux - Build the bare kernel'
906	@echo '* modules - Build all modules'
907	@echo ' modules_install - Install all modules'
908	@echo ' dir/ - Build all files in dir and below'
909	@echo ' dir/file.[ois] - Build specified target only'
910	@echo ' rpm - Build a kernel as an RPM package'
911	@echo ' tags/TAGS - Generate tags file for editors'
912	@echo ' cscope - Generate cscope index'
913	@echo ' checkstack - Generate a list of stack hogs'
914	@echo ''
915	@echo 'Documentation targets:'
916	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
917	@echo ''
918	@echo 'Architecture specific targets ($(ARCH)):'
919	@$(if $(archhelp),$(archhelp),\
920	echo ' No architecture specific help defined for $(ARCH)')
921	@echo ''
922	@$(if $(boards), \
923	$(foreach b, $(boards), \
924	printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
925	echo '')
926
927	@echo ' make V=0\|1 [targets] 0 => quiet build (default), 1 => verbose build'
928	@echo ' make O=dir [targets] Locate all output files in "dir", including .config'
929	@echo ' make C=1 [targets] Check all c source with checker tool'
930	@echo ''
931	@echo 'Execute "make" or "make all" to build all targets marked with [*] '
932	@echo 'For further info see the ./README file'
933
934
935	# Documentation targets
936	# ---------------------------------------------------------------------------
937	%docs: scripts_basic FORCE
938	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
939
940	else # KBUILD_EXTMOD
941
942	###
943	# External module support.
944	# When building external modules the kernel used as basis is considered
945	# read-only, and no consistency checks are made and the make
946	# system is not used on the basis kernel. If updates are required
947	# in the basis kernel ordinary make commands (without M=...) must
948	# be used.
949	#
950	# The following are the only valid targets when building external
951	# modules.
952	# make M=dir clean Delete all automatically generated files
953	# make M=dir modules Make all modules in specified dir
954	# make M=dir Same as 'make M=dir modules'
955	# make M=dir modules_install
956	# Install the modules build in the module directory
957	# Assumes install directory is already created
958
959	# We are always building modules
960	KBUILD_MODULES := 1
961	.PHONY: crmodverdir
962	crmodverdir:
963	$(Q)mkdir -p $(MODVERDIR)
964
965	module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
966	.PHONY: $(module-dirs) modules
967	$(module-dirs): crmodverdir
968	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
969
970	modules: $(module-dirs)
971	@echo ' Building modules, stage 2.';
972	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
973
974	.PHONY: modules_install
975	modules_install:
976	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
977
978	clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
979
980	.PHONY: $(clean-dirs) clean
981	$(clean-dirs):
982	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
983
984	clean: rm-dirs := $(MODVERDIR)
985	clean: $(clean-dirs)
986	$(call cmd,rmdirs)
987	@find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
988	\( -name '.[oas]' -o -name '.ko' -o -name '.*.cmd' \
989	-o -name '..d' -o -name '..tmp' -o -name '*.mod.c' \) \
990	-type f -print \| xargs rm -f
991
992	help:
993	@echo ' Building external modules.'
994	@echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
995	@echo ''
996	@echo ' modules - default target, build the module(s)'
997	@echo ' modules_install - install the module'
998	@echo ' clean - remove generated files in module directory only'
999	@echo ''
1000	endif # KBUILD_EXTMOD
1001
1002	# Generate tags for editors
1003	# ---------------------------------------------------------------------------
1004
1005	define all-sources
1006	( find . $(RCS_FIND_IGNORE) \
1007	$ -name include -o -name arch $ -prune -o \
1008	-name '*.[chS]' -print; \
1009	find arch/$(ARCH) $(RCS_FIND_IGNORE) \
1010	-name '*.[chS]' -print; \
1011	find security/selinux/include $(RCS_FIND_IGNORE) \
1012	-name '*.[chS]' -print; \
1013	find include $(RCS_FIND_IGNORE) \
1014	$ -name config -o -name 'asm-*' $ -prune \
1015	-o -name '*.[chS]' -print; \
1016	find include/asm-$(ARCH) $(RCS_FIND_IGNORE) \
1017	-name '*.[chS]' -print; \
1018	find include/asm-generic $(RCS_FIND_IGNORE) \
1019	-name '*.[chS]' -print )
1020	endef
1021
1022	quiet_cmd_cscope-file = FILELST cscope.files
1023	cmd_cscope-file = $(all-sources) > cscope.files
1024
1025	quiet_cmd_cscope = MAKE cscope.out
1026	cmd_cscope = cscope -k -b -q
1027
1028	cscope: FORCE
1029	$(call cmd,cscope-file)
1030	$(call cmd,cscope)
1031
1032	quiet_cmd_TAGS = MAKE $@
1033	cmd_TAGS = $(all-sources) \| etags -
1034
1035	# Exuberant ctags works better with -I
1036
1037	quiet_cmd_tags = MAKE $@
1038	define cmd_tags
1039	rm -f $@; \
1040	CTAGSF=`ctags --version \| grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
1041	$(all-sources) \| xargs ctags $$CTAGSF -a
1042	endef
1043
1044	TAGS: FORCE
1045	$(call cmd,TAGS)
1046
1047	tags: FORCE
1048	$(call cmd,tags)
1049
1050
1051	# Scripts to check various things for consistency
1052	# ---------------------------------------------------------------------------
1053
1054	configcheck:
1055	find * $(RCS_FIND_IGNORE) \
1056	-name '*.[hcS]' -type f -print \| sort \
1057	\| xargs $(PERL) -w scripts/checkconfig.pl
1058
1059	includecheck:
1060	find * $(RCS_FIND_IGNORE) \
1061	-name '*.[hcS]' -type f -print \| sort \
1062	\| xargs $(PERL) -w scripts/checkincludes.pl
1063
1064	versioncheck:
1065	find * $(RCS_FIND_IGNORE) \
1066	-name '*.[hcS]' -type f -print \| sort \
1067	\| xargs $(PERL) -w scripts/checkversion.pl
1068
1069	buildcheck:
1070	$(PERL) scripts/reference_discarded.pl
1071	$(PERL) scripts/reference_init.pl
1072
1073	endif #ifeq ($(config-targets),1)
1074	endif #ifeq ($(mixed-targets),1)
1075
1076	.PHONY: checkstack
1077	checkstack:
1078	$(OBJDUMP) -d vmlinux $$(*find . -name '.ko'**) \| \
1079	$(PERL) scripts/checkstack.pl $(ARCH)
1080
1081	# FIXME Should go into a make.lib or something
1082	# ===========================================================================
1083
1084	quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1085	cmd_rmdirs = rm -rf $(rm-dirs)
1086
1087	quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1088	cmd_rmfiles = rm -f $(rm-files)
1089
1090
1091	a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1092	$(NOSTDINC_FLAGS) $(CPPFLAGS) \
1093	$(modkern_aflags) $(EXTRA_AFLAGS) $(*AFLAGS_$(F).o**)
1094
1095	quiet_cmd_as_o_S = AS $@
1096	cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1097
1098	# read all saved command lines
1099
1100	targets := $(wildcard $(sort $(targets)))
1101	cmd_files := $(*wildcard ..cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)**)
1102
1103	ifneq ($(cmd_files),)
1104	$(cmd_files): ; # Do not try to update included dependency files
1105	include $(cmd_files)
1106	endif
1107
1108	# execute the command and also postprocess generated .d dependencies
1109	# file
1110
1111	if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
1112	$(filter-out $(cmd_$(1)),$(cmd_$@))\
1113	$(filter-out $(cmd_$@),$(cmd_$(1)))),\
1114	@set -e; \
1115	$(if $($(quiet)cmd_$(1)),echo ' $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1116	$(cmd_$(1)); \
1117	scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
1118	rm -f $(depfile); \
1119	mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
1120
1121	# Usage: $(call if_changed_rule,foo)
1122	# will check if $(cmd_foo) changed, or any of the prequisites changed,
1123	# and if so will execute $(rule_foo)
1124
1125	if_changed_rule = $(if $(strip $? \
1126	$(filter-out $(cmd_$(1)),$(cmd_$(@F)))\
1127	$(filter-out $(cmd_$(@F)),$(cmd_$(1)))),\
1128	@$(rule_$(1)))
1129
1130	# If quiet is set, only print short version of command
1131
1132	cmd = @$(if $($(quiet)cmd_$(1)),echo ' $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
1133
1134	# filechk is used to check if the content of a generated file is updated.
1135	# Sample usage:
1136	# define filechk_sample
1137	# echo $KERNELRELEASE
1138	# endef
1139	# version.h : Makefile
1140	# $(call filechk,sample)
1141	# The rule defined shall write to stdout the content of the new file.
1142	# The existing file will be compared with the new one.
1143	# - If no file exist it is created
1144	# - If the content differ the new file is used
1145	# - If they are equal no change, and no timestamp update
1146
1147	define filechk
1148	@set -e; \
1149	echo ' CHK $@'; \
1150	mkdir -p $(dir $@); \
1151	$(filechk_$(1)) < $< > $@.tmp; \
1152	if [ -r $@ ] && cmp -s $@ $@.tmp; then \
1153	rm -f $@.tmp; \
1154	else \
1155	echo ' UPD $@'; \
1156	mv -f $@.tmp $@; \
1157	fi
1158	endef
1159
1160	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1161	# Usage:
1162	# $(Q)$(MAKE) $(build)=dir
1163	build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
1164
1165	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1166	# Usage:
1167	# $(Q)$(MAKE) $(clean)=dir
1168	clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1169
1170	# $(call descend,<dir>,<target>)
1171	# Recursively call a sub-make in <dir> with target <target>
1172	# Usage is deprecated, because make does not see this as an invocation of make.
1173	descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
1174
1175	endif # skip-makefile
1176
1177	FORCE:

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