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-rw-r--r--Documentation/kbuild/modules.txt11
-rw-r--r--Makefile66
2 files changed, 55 insertions, 22 deletions
diff --git a/Documentation/kbuild/modules.txt b/Documentation/kbuild/modules.txt
index 7e77f93634ea..87d858df4e34 100644
--- a/Documentation/kbuild/modules.txt
+++ b/Documentation/kbuild/modules.txt
@@ -13,6 +13,7 @@ In this document you will find information about:
13 --- 2.2 Available targets 13 --- 2.2 Available targets
14 --- 2.3 Available options 14 --- 2.3 Available options
15 --- 2.4 Preparing the kernel tree for module build 15 --- 2.4 Preparing the kernel tree for module build
16 --- 2.5 Building separate files for a module
16 === 3. Example commands 17 === 3. Example commands
17 === 4. Creating a kbuild file for an external module 18 === 4. Creating a kbuild file for an external module
18 === 5. Include files 19 === 5. Include files
@@ -131,6 +132,16 @@ when building an external module.
131 Therefore a full kernel build needs to be executed to make 132 Therefore a full kernel build needs to be executed to make
132 module versioning work. 133 module versioning work.
133 134
135--- 2.5 Building separate files for a module
136 It is possible to build single files which is part of a module.
137 This works equal for the kernel, a module and even for external
138 modules.
139 Examples (module foo.ko, consist of bar.o, baz.o):
140 make -C $KDIR M=`pwd` bar.lst
141 make -C $KDIR M=`pwd` bar.o
142 make -C $KDIR M=`pwd` foo.ko
143 make -C $KDIR M=`pwd` /
144
134 145
135=== 3. Example commands 146=== 3. Example commands
136 147
diff --git a/Makefile b/Makefile
index 77a448c8e776..639d8a48bbde 100644
--- a/Makefile
+++ b/Makefile
@@ -137,7 +137,7 @@ objtree := $(CURDIR)
137src := $(srctree) 137src := $(srctree)
138obj := $(objtree) 138obj := $(objtree)
139 139
140VPATH := $(srctree) 140VPATH := $(srctree):$(KBUILD_EXTMOD)
141 141
142export srctree objtree VPATH TOPDIR 142export srctree objtree VPATH TOPDIR
143 143
@@ -849,27 +849,6 @@ prepare prepare-all: prepare0
849 849
850export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH) 850export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
851 851
852# Single targets
853# ---------------------------------------------------------------------------
854
855%.s: %.c scripts FORCE
856 $(Q)$(MAKE) $(build)=$(@D) $@
857%.i: %.c scripts FORCE
858 $(Q)$(MAKE) $(build)=$(@D) $@
859%.o: %.c scripts FORCE
860 $(Q)$(MAKE) $(build)=$(@D) $@
861%.ko: scripts FORCE
862 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D) $(@:.ko=.o)
863 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
864%/: scripts prepare FORCE
865 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
866%.lst: %.c scripts FORCE
867 $(Q)$(MAKE) $(build)=$(@D) $@
868%.s: %.S scripts FORCE
869 $(Q)$(MAKE) $(build)=$(@D) $@
870%.o: %.S scripts FORCE
871 $(Q)$(MAKE) $(build)=$(@D) $@
872
873# FIXME: The asm symlink changes when $(ARCH) changes. That's 852# FIXME: The asm symlink changes when $(ARCH) changes. That's
874# hard to detect, but I suppose "make mrproper" is a good idea 853# hard to detect, but I suppose "make mrproper" is a good idea
875# before switching between archs anyway. 854# before switching between archs anyway.
@@ -1192,6 +1171,11 @@ help:
1192 @echo ' modules_install - install the module' 1171 @echo ' modules_install - install the module'
1193 @echo ' clean - remove generated files in module directory only' 1172 @echo ' clean - remove generated files in module directory only'
1194 @echo '' 1173 @echo ''
1174
1175# Dummies...
1176.PHONY: prepare scripts
1177prepare: ;
1178scripts: ;
1195endif # KBUILD_EXTMOD 1179endif # KBUILD_EXTMOD
1196 1180
1197# Generate tags for editors 1181# Generate tags for editors
@@ -1313,6 +1297,44 @@ kernelrelease:
1313kernelversion: 1297kernelversion:
1314 @echo $(KERNELVERSION) 1298 @echo $(KERNELVERSION)
1315 1299
1300# Single targets
1301# ---------------------------------------------------------------------------
1302# The directory part is taken from first prerequisite, so this
1303# works even with external modules
1304%.s: %.c scripts FORCE
1305 $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1306%.i: %.c scripts FORCE
1307 $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1308%.o: %.c scripts FORCE
1309 $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1310%.lst: %.c scripts FORCE
1311 $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1312%.s: %.S scripts FORCE
1313 $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1314%.o: %.S scripts FORCE
1315 $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1316
1317# For external modules we shall include any directory of the target,
1318# but usual case there is no directory part.
1319# make M=`pwd` module.o => $(dir $@)=./
1320# make M=`pwd` foo/module.o => $(dir $@)=foo/
1321# make M=`pwd` / => $(dir $@)=/
1322
1323ifeq ($(KBUILD_EXTMOD),)
1324 target-dir = $(@D)
1325else
1326 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1327 target-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1328endif
1329
1330/ %/: scripts prepare FORCE
1331 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1332 $(build)=$(target-dir)
1333%.ko: scripts FORCE
1334 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1335 $(build)=$(target-dir) $(@:.ko=.o)
1336 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1337
1316# FIXME Should go into a make.lib or something 1338# FIXME Should go into a make.lib or something
1317# =========================================================================== 1339# ===========================================================================
1318 1340