ia64/linux-2.6.18-xen.hg

view scripts/Makefile.modpost @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
1 # ===========================================================================
2 # Module versions
3 # ===========================================================================
4 #
5 # Stage one of module building created the following:
6 # a) The individual .o files used for the module
7 # b) A <module>.o file which is the .o files above linked together
8 # c) A <module>.mod file in $(MODVERDIR)/, listing the name of the
9 # the preliminary <module>.o file, plus all .o files
11 # Stage 2 is handled by this file and does the following
12 # 1) Find all modules from the files listed in $(MODVERDIR)/
13 # 2) modpost is then used to
14 # 3) create one <module>.mod.c file pr. module
15 # 4) create one Module.symvers file with CRC for all exported symbols
16 # 5) compile all <module>.mod.c files
17 # 6) final link of the module to a <module.ko> file
19 # Step 3 is used to place certain information in the module's ELF
20 # section, including information such as:
21 # Version magic (see include/vermagic.h for full details)
22 # - Kernel release
23 # - SMP is CONFIG_SMP
24 # - PREEMPT is CONFIG_PREEMPT
25 # - GCC Version
26 # Module info
27 # - Module version (MODULE_VERSION)
28 # - Module alias'es (MODULE_ALIAS)
29 # - Module license (MODULE_LICENSE)
30 # - See include/linux/module.h for more details
32 # Step 4 is solely used to allow module versioning in external modules,
33 # where the CRC of each module is retrieved from the Module.symers file.
35 PHONY := _modpost
36 _modpost: __modpost
38 include include/config/auto.conf
39 include scripts/Kbuild.include
40 include scripts/Makefile.lib
42 kernelsymfile := $(objtree)/Module.symvers
43 modulesymfile := $(KBUILD_EXTMOD)/Module.symvers
45 # Step 1), find all modules listed in $(MODVERDIR)/
46 __modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod)))
47 modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))
49 _modpost: $(modules)
52 # Step 2), invoke modpost
53 # Includes step 3,4
54 quiet_cmd_modpost = MODPOST
55 cmd_modpost = scripts/mod/modpost \
56 $(if $(CONFIG_MODVERSIONS),-m) \
57 $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \
58 $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \
59 $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \
60 $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
61 $(filter-out FORCE,$^)
63 PHONY += __modpost
64 __modpost: $(wildcard vmlinux) $(modules:.ko=.o) FORCE
65 $(call cmd,modpost)
67 # Declare generated files as targets for modpost
68 $(symverfile): __modpost ;
69 $(modules:.ko=.mod.c): __modpost ;
72 # Step 5), compile all *.mod.c files
74 # modname is set to make c_flags define KBUILD_MODNAME
75 modname = $(notdir $(@:.mod.o=))
77 quiet_cmd_cc_o_c = CC $@
78 cmd_cc_o_c = $(CC) $(c_flags) $(CFLAGS_MODULE) \
79 -c -o $@ $<
81 $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE
82 $(call if_changed_dep,cc_o_c)
84 targets += $(modules:.ko=.mod.o)
86 # Step 6), final link of the modules
87 quiet_cmd_ld_ko_o = LD [M] $@
88 cmd_ld_ko_o = $(LD) $(LDFLAGS) $(LDFLAGS_MODULE) -o $@ \
89 $(filter-out FORCE,$^)
91 $(modules): %.ko :%.o %.mod.o FORCE
92 $(call if_changed,ld_ko_o)
94 targets += $(modules)
97 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
98 # ---------------------------------------------------------------------------
100 PHONY += FORCE
102 FORCE:
104 # Read all saved command lines and dependencies for the $(targets) we
105 # may be building above, using $(if_changed{,_dep}). As an
106 # optimization, we don't need to read them if the target does not
107 # exist, we will rebuild anyway in that case.
109 targets := $(wildcard $(sort $(targets)))
110 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
112 ifneq ($(cmd_files),)
113 include $(cmd_files)
114 endif
117 # Declare the contents of the .PHONY variable as phony. We keep that
118 # information in a variable se we can use it in if_changed and friends.
120 .PHONY: $(PHONY)