mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 12:42:02 +00:00
f83b5e323f
This patch fixes a problem when we use well known kernel symbols as module names. For example, if module source name is current.c, idle_stack.c or etc., we have a bad KBUILD_MODNAME value. For example, KBUILD_MODNAME will be "get_current()" instead of "current", or "(init_thread_union.stack)" instead of "idle_task". The trick is to define a stringify macro on the commandline - named KBUILD_STR for namespace reasons - and then to stringify the module name. There are a few uses of KBUILD_MODNAME throughout the tree but the usage is for debug and will not be harmed by this change so left untouched for now. While at it KBUILD_BASENAME was changed too. Any spinlock usage in the unix module would have created wrong section names without it. Usage in spinlock.h fixed so it no longer stringify KBUILD_BASENAME. Original patch from Ustyogov Roman - all bugs introduced by me. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
171 lines
6.6 KiB
Makefile
171 lines
6.6 KiB
Makefile
# Backward compatibility - to be removed...
|
|
extra-y += $(EXTRA_TARGETS)
|
|
# Figure out what we need to build from the various variables
|
|
# ===========================================================================
|
|
|
|
# When an object is listed to be built compiled-in and modular,
|
|
# only build the compiled-in version
|
|
|
|
obj-m := $(filter-out $(obj-y),$(obj-m))
|
|
|
|
# Libraries are always collected in one lib file.
|
|
# Filter out objects already built-in
|
|
|
|
lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
|
|
|
|
|
|
# Handle objects in subdirs
|
|
# ---------------------------------------------------------------------------
|
|
# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
|
|
# and add the directory to the list of dirs to descend into: $(subdir-y)
|
|
# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
|
|
# and add the directory to the list of dirs to descend into: $(subdir-m)
|
|
|
|
__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
|
|
subdir-y += $(__subdir-y)
|
|
__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
|
|
subdir-m += $(__subdir-m)
|
|
obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
|
|
obj-m := $(filter-out %/, $(obj-m))
|
|
|
|
# Subdirectories we need to descend into
|
|
|
|
subdir-ym := $(sort $(subdir-y) $(subdir-m))
|
|
|
|
# if $(foo-objs) exists, foo.o is a composite object
|
|
multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
|
|
multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
|
|
multi-used := $(multi-used-y) $(multi-used-m)
|
|
single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
|
|
|
|
# Build list of the parts of our composite objects, our composite
|
|
# objects depend on those (obviously)
|
|
multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
|
|
multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
|
|
multi-objs := $(multi-objs-y) $(multi-objs-m)
|
|
|
|
# $(subdir-obj-y) is the list of objects in $(obj-y) which do not live
|
|
# in the local directory
|
|
subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))
|
|
|
|
# $(obj-dirs) is a list of directories that contain object files
|
|
obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
|
|
|
|
# Replace multi-part objects by their individual parts, look at local dir only
|
|
real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
|
|
real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
|
|
|
|
# Add subdir path
|
|
|
|
extra-y := $(addprefix $(obj)/,$(extra-y))
|
|
always := $(addprefix $(obj)/,$(always))
|
|
targets := $(addprefix $(obj)/,$(targets))
|
|
obj-y := $(addprefix $(obj)/,$(obj-y))
|
|
obj-m := $(addprefix $(obj)/,$(obj-m))
|
|
lib-y := $(addprefix $(obj)/,$(lib-y))
|
|
subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
|
|
real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
|
|
real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
|
|
single-used-m := $(addprefix $(obj)/,$(single-used-m))
|
|
multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
|
|
multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
|
|
multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
|
|
multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
|
|
subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
|
|
obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
|
|
|
|
# These flags are needed for modversions and compiling, so we define them here
|
|
# already
|
|
# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
|
|
# end up in (or would, if it gets compiled in)
|
|
# Note: It's possible that one object gets potentially linked into more
|
|
# than one module. In that case KBUILD_MODNAME will be set to foo_bar,
|
|
# where foo and bar are the name of the modules.
|
|
name-fix = $(subst $(comma),_,$(subst -,_,$1))
|
|
basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(*F)))"
|
|
modname_flags = $(if $(filter 1,$(words $(modname))),\
|
|
-D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
|
|
|
|
_c_flags = $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o)
|
|
_a_flags = $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
|
|
_cpp_flags = $(CPPFLAGS) $(EXTRA_CPPFLAGS) $(CPPFLAGS_$(@F))
|
|
|
|
# If building the kernel in a separate objtree expand all occurrences
|
|
# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
|
|
|
|
ifeq ($(KBUILD_SRC),)
|
|
__c_flags = $(_c_flags)
|
|
__a_flags = $(_a_flags)
|
|
__cpp_flags = $(_cpp_flags)
|
|
else
|
|
|
|
# Prefix -I with $(srctree) if it is not an absolute path
|
|
addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
|
|
# Find all -I options and call addtree
|
|
flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
|
|
|
|
# -I$(obj) locates generated .h files
|
|
# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
|
|
# and locates generated .h files
|
|
# FIXME: Replace both with specific CFLAGS* statements in the makefiles
|
|
__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
|
|
__a_flags = $(call flags,_a_flags)
|
|
__cpp_flags = $(call flags,_cpp_flags)
|
|
endif
|
|
|
|
c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
|
|
$(__c_flags) $(modkern_cflags) \
|
|
-D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
|
|
|
|
a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
|
|
$(__a_flags) $(modkern_aflags)
|
|
|
|
cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags)
|
|
|
|
ld_flags = $(LDFLAGS) $(EXTRA_LDFLAGS)
|
|
|
|
# Finds the multi-part object the current object will be linked into
|
|
modname-multi = $(sort $(foreach m,$(multi-used),\
|
|
$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
|
|
|
|
# Shipped files
|
|
# ===========================================================================
|
|
|
|
quiet_cmd_shipped = SHIPPED $@
|
|
cmd_shipped = cat $< > $@
|
|
|
|
$(obj)/%:: $(src)/%_shipped
|
|
$(call cmd,shipped)
|
|
|
|
# Commands useful for building a boot image
|
|
# ===========================================================================
|
|
#
|
|
# Use as following:
|
|
#
|
|
# target: source(s) FORCE
|
|
# $(if_changed,ld/objcopy/gzip)
|
|
#
|
|
# and add target to EXTRA_TARGETS so that we know we have to
|
|
# read in the saved command line
|
|
|
|
# Linking
|
|
# ---------------------------------------------------------------------------
|
|
|
|
quiet_cmd_ld = LD $@
|
|
cmd_ld = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) \
|
|
$(filter-out FORCE,$^) -o $@
|
|
|
|
# Objcopy
|
|
# ---------------------------------------------------------------------------
|
|
|
|
quiet_cmd_objcopy = OBJCOPY $@
|
|
cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
|
|
|
|
# Gzip
|
|
# ---------------------------------------------------------------------------
|
|
|
|
quiet_cmd_gzip = GZIP $@
|
|
cmd_gzip = gzip -f -9 < $< > $@
|
|
|
|
|