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-rw-r--r--scripts/Kbuild.include80
-rw-r--r--scripts/Kconfig.include6
-rw-r--r--scripts/Makefile.asm-generic4
-rw-r--r--scripts/Makefile.build19
-rw-r--r--scripts/Makefile.clean2
-rw-r--r--scripts/Makefile.compiler74
-rw-r--r--scripts/Makefile.dtbinst2
-rw-r--r--scripts/Makefile.headersinst2
-rw-r--r--scripts/Makefile.lib16
-rw-r--r--scripts/Makefile.modinst113
-rw-r--r--scripts/Makefile.modpost32
-rw-r--r--scripts/Makefile.modsign29
-rw-r--r--scripts/Makefile.package2
-rwxr-xr-xscripts/as-version.sh82
-rw-r--r--scripts/basic/fixdep.c43
-rwxr-xr-xscripts/cc-version.sh20
-rwxr-xr-xscripts/dummy-tools/gcc6
-rw-r--r--scripts/kconfig/confdata.c15
-rwxr-xr-xscripts/ld-version.sh11
-rwxr-xr-xscripts/link-vmlinux.sh12
-rwxr-xr-xscripts/min-tool-version.sh39
-rw-r--r--scripts/mod/modpost.c50
-rwxr-xr-xscripts/modules-check.sh4
-rwxr-xr-xscripts/test_dwarf5_support.sh8
24 files changed, 405 insertions, 266 deletions
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 509e0856d653..82dd1b65b7a8 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -67,86 +67,6 @@ define filechk
fi
endef
-######
-# gcc support functions
-# See documentation in Documentation/kbuild/makefiles.rst
-
-# cc-cross-prefix
-# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
-# Return first <prefix> where a <prefix>gcc is found in PATH.
-# If no gcc found in PATH with listed prefixes return nothing
-#
-# Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it
-# would try to directly execute the shell builtin 'command'. This workaround
-# should be kept for a long time since this issue was fixed only after the
-# GNU Make 4.2.1 release.
-cc-cross-prefix = $(firstword $(foreach c, $(1), \
- $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c))))
-
-# output directory for tests below
-TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$
-
-# try-run
-# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
-# Exit code chooses option. "$$TMP" serves as a temporary file and is
-# automatically cleaned up.
-try-run = $(shell set -e; \
- TMP=$(TMPOUT)/tmp; \
- TMPO=$(TMPOUT)/tmp.o; \
- mkdir -p $(TMPOUT); \
- trap "rm -rf $(TMPOUT)" EXIT; \
- if ($(1)) >/dev/null 2>&1; \
- then echo "$(2)"; \
- else echo "$(3)"; \
- fi)
-
-# as-option
-# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
-
-as-option = $(call try-run,\
- $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
-
-# as-instr
-# Usage: cflags-y += $(call as-instr,instr,option1,option2)
-
-as-instr = $(call try-run,\
- printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
-
-# __cc-option
-# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
-__cc-option = $(call try-run,\
- $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
-
-# cc-option
-# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
-
-cc-option = $(call __cc-option, $(CC),\
- $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
-
-# cc-option-yn
-# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
-cc-option-yn = $(call try-run,\
- $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
-
-# cc-disable-warning
-# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
-cc-disable-warning = $(call try-run,\
- $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
-
-# cc-ifversion
-# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
-cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4))
-
-# ld-option
-# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
-ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
-
-# ld-ifversion
-# Usage: $(call ld-ifversion, -ge, 22252, y)
-ld-ifversion = $(shell [ $(CONFIG_LD_VERSION)0 $(1) $(2)0 ] && echo $(3) || echo $(4))
-
-######
-
###
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
# Usage:
diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
index 58fdb5308725..0496efd6e117 100644
--- a/scripts/Kconfig.include
+++ b/scripts/Kconfig.include
@@ -45,6 +45,12 @@ $(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this compiler is not su
cc-name := $(shell,set -- $(cc-info) && echo $1)
cc-version := $(shell,set -- $(cc-info) && echo $2)
+# Get the assembler name, version, and error out if it is not supported.
+as-info := $(shell,$(srctree)/scripts/as-version.sh $(CC) $(CLANG_FLAGS))
+$(error-if,$(success,test -z "$(as-info)"),Sorry$(comma) this assembler is not supported.)
+as-name := $(shell,set -- $(as-info) && echo $1)
+as-version := $(shell,set -- $(as-info) && echo $2)
+
# Get the linker name, version, and error out if it is not supported.
ld-info := $(shell,$(srctree)/scripts/ld-version.sh $(LD))
$(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supported.)
diff --git a/scripts/Makefile.asm-generic b/scripts/Makefile.asm-generic
index 82ad63dcd62b..1d501c57f9ef 100644
--- a/scripts/Makefile.asm-generic
+++ b/scripts/Makefile.asm-generic
@@ -14,10 +14,10 @@ src := $(subst /generated,,$(obj))
# $(generic)/Kbuild lists mandatory-y. Exclude um since it is a special case.
ifneq ($(SRCARCH),um)
-include $(generic)/Kbuild
+include $(srctree)/$(generic)/Kbuild
endif
-include scripts/Kbuild.include
+include $(srctree)/scripts/Kbuild.include
redundant := $(filter $(mandatory-y) $(generated-y), $(generic-y))
redundant += $(foreach f, $(generic-y), $(if $(wildcard $(srctree)/$(src)/$(f)),$(f)))
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 1b6094a13034..5e39b0517186 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -35,27 +35,28 @@ subdir-ccflags-y :=
# Read auto.conf if it exists, otherwise ignore
-include include/config/auto.conf
-include scripts/Kbuild.include
+include $(srctree)/scripts/Kbuild.include
+include $(srctree)/scripts/Makefile.compiler
# The filename Kbuild has precedence over Makefile
kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
include $(kbuild-file)
-include scripts/Makefile.lib
+include $(srctree)/scripts/Makefile.lib
# Do not include hostprogs rules unless needed.
# $(sort ...) is used here to remove duplicated words and excessive spaces.
hostprogs := $(sort $(hostprogs))
ifneq ($(hostprogs),)
-include scripts/Makefile.host
+include $(srctree)/scripts/Makefile.host
endif
# Do not include userprogs rules unless needed.
# $(sort ...) is used here to remove duplicated words and excessive spaces.
userprogs := $(sort $(userprogs))
ifneq ($(userprogs),)
-include scripts/Makefile.userprogs
+include $(srctree)/scripts/Makefile.userprogs
endif
ifndef obj
@@ -238,8 +239,8 @@ endif # CONFIG_STACK_VALIDATION
# Rebuild all objects when objtool changes, or is enabled/disabled.
objtool_dep = $(objtool_obj) \
- $(wildcard include/config/orc/unwinder.h \
- include/config/stack/validation.h)
+ $(wildcard include/config/ORC_UNWINDER \
+ include/config/STACK_VALIDATION)
ifdef CONFIG_TRIM_UNUSED_KSYMS
cmd_gen_ksymdeps = \
@@ -444,11 +445,11 @@ quiet_cmd_link_multi-m = LD [M] $@
cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^)
endif
-$(multi-used-m): FORCE
+$(multi-obj-m): FORCE
$(call if_changed,link_multi-m)
-$(call multi_depend, $(multi-used-m), .o, -objs -y -m)
+$(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
-targets += $(multi-used-m)
+targets += $(multi-obj-m)
targets := $(filter-out $(PHONY), $(targets))
# Add intermediate targets:
diff --git a/scripts/Makefile.clean b/scripts/Makefile.clean
index 22a8172bce1f..fd6175322470 100644
--- a/scripts/Makefile.clean
+++ b/scripts/Makefile.clean
@@ -8,7 +8,7 @@ src := $(obj)
PHONY := __clean
__clean:
-include scripts/Kbuild.include
+include $(srctree)/scripts/Kbuild.include
# The filename Kbuild has precedence over Makefile
kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
new file mode 100644
index 000000000000..86ecd2ac874c
--- /dev/null
+++ b/scripts/Makefile.compiler
@@ -0,0 +1,74 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+# cc-cross-prefix
+# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
+# Return first <prefix> where a <prefix>gcc is found in PATH.
+# If no gcc found in PATH with listed prefixes return nothing
+#
+# Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it
+# would try to directly execute the shell builtin 'command'. This workaround
+# should be kept for a long time since this issue was fixed only after the
+# GNU Make 4.2.1 release.
+cc-cross-prefix = $(firstword $(foreach c, $(1), \
+ $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c))))
+
+# output directory for tests below
+TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$
+
+# try-run
+# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
+# Exit code chooses option. "$$TMP" serves as a temporary file and is
+# automatically cleaned up.
+try-run = $(shell set -e; \
+ TMP=$(TMPOUT)/tmp; \
+ mkdir -p $(TMPOUT); \
+ trap "rm -rf $(TMPOUT)" EXIT; \
+ if ($(1)) >/dev/null 2>&1; \
+ then echo "$(2)"; \
+ else echo "$(3)"; \
+ fi)
+
+# as-option
+# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
+
+as-option = $(call try-run,\
+ $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
+
+# as-instr
+# Usage: cflags-y += $(call as-instr,instr,option1,option2)
+
+as-instr = $(call try-run,\
+ printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
+
+# __cc-option
+# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
+__cc-option = $(call try-run,\
+ $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
+
+# cc-option
+# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
+
+cc-option = $(call __cc-option, $(CC),\
+ $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
+
+# cc-option-yn
+# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
+cc-option-yn = $(call try-run,\
+ $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
+
+# cc-disable-warning
+# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
+cc-disable-warning = $(call try-run,\
+ $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
+
+# cc-ifversion
+# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
+cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4))
+
+# ld-option
+# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
+ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
+
+# ld-ifversion
+# Usage: $(call ld-ifversion, -ge, 22252, y)
+ld-ifversion = $(shell [ $(CONFIG_LD_VERSION)0 $(1) $(2)0 ] && echo $(3) || echo $(4))
diff --git a/scripts/Makefile.dtbinst b/scripts/Makefile.dtbinst
index ba01f5ba2517..190d781e84f4 100644
--- a/scripts/Makefile.dtbinst
+++ b/scripts/Makefile.dtbinst
@@ -14,7 +14,7 @@ PHONY := __dtbs_install
__dtbs_install:
include include/config/auto.conf
-include scripts/Kbuild.include
+include $(srctree)/scripts/Kbuild.include
include $(src)/Makefile
dtbs := $(addprefix $(dst)/, $(dtb-y) $(if $(CONFIG_OF_ALL_DTBS),$(dtb-)))
diff --git a/scripts/Makefile.headersinst b/scripts/Makefile.headersinst
index 708fbd08a2c5..029d85bb0b23 100644
--- a/scripts/Makefile.headersinst
+++ b/scripts/Makefile.headersinst
@@ -12,7 +12,7 @@
PHONY := __headers
__headers:
-include scripts/Kbuild.include
+include $(srctree)/scripts/Kbuild.include
src := $(srctree)/$(obj)
gen := $(objtree)/$(subst include/,include/generated/,$(obj))
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 659bddbd55e2..64daf37e874b 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -45,16 +45,16 @@ obj-y := $(filter-out %/, $(obj-y))
endif
# Expand $(foo-objs) $(foo-y) by calling $(call suffix-search,foo.o,-objs -y)
-suffix-search = $(foreach s,$(2),$($(1:.o=$s)))
+suffix-search = $(strip $(foreach s, $2, $($(1:.o=$s))))
# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
-multi-search = $(sort $(foreach m,$(1), $(if $(strip $(call suffix-search,$(m),$(2) -)), $(m))))
-multi-used-y := $(call multi-search,$(obj-y),-objs -y)
-multi-used-m := $(call multi-search,$(obj-m),-objs -y -m)
-multi-used := $(multi-used-y) $(multi-used-m)
+multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2 -), $m)))
+multi-obj-y := $(call multi-search,$(obj-y),-objs -y)
+multi-obj-m := $(call multi-search,$(obj-m),-objs -y -m)
+multi-obj-ym := $(multi-obj-y) $(multi-obj-m)
# Replace multi-part objects by their individual parts,
# including built-in.a from subdirectories
-real-search = $(foreach m,$(1), $(if $(strip $(call suffix-search,$(m),$(2) -)),$(call suffix-search,$(m),$(2)),$(m)))
+real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2 -), $(call suffix-search, $m, $2), $m))
real-obj-y := $(call real-search, $(obj-y),-objs -y)
real-obj-m := $(call real-search, $(obj-m),-objs -y -m)
@@ -104,12 +104,12 @@ obj-m := $(addprefix $(obj)/,$(obj-m))
lib-y := $(addprefix $(obj)/,$(lib-y))
real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
-multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
+multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m))
subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
# Finds the multi-part object the current object will be linked into.
# If the object belongs to two or more multi-part objects, list them all.
-modname-multi = $(sort $(foreach m,$(multi-used),\
+modname-multi = $(sort $(foreach m,$(multi-obj-ym),\
$(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=))))
__modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
index 5a4579e76485..ff9b09e4cfca 100644
--- a/scripts/Makefile.modinst
+++ b/scripts/Makefile.modinst
@@ -6,30 +6,109 @@
PHONY := __modinst
__modinst:
-include scripts/Kbuild.include
+include include/config/auto.conf
+include $(srctree)/scripts/Kbuild.include
-modules := $(sort $(shell cat $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order))
+modules := $(sort $(shell cat $(MODORDER)))
+
+ifeq ($(KBUILD_EXTMOD),)
+dst := $(MODLIB)/kernel
+else
+INSTALL_MOD_DIR ?= extra
+dst := $(MODLIB)/$(INSTALL_MOD_DIR)
+endif
+
+suffix-y :=
+suffix-$(CONFIG_MODULE_COMPRESS_GZIP) := .gz
+suffix-$(CONFIG_MODULE_COMPRESS_XZ) := .xz
+suffix-$(CONFIG_MODULE_COMPRESS_ZSTD) := .zst
+
+modules := $(patsubst $(extmod_prefix)%, $(dst)/%$(suffix-y), $(modules))
-PHONY += $(modules)
__modinst: $(modules)
@:
-# Don't stop modules_install if we can't sign external modules.
-quiet_cmd_modules_install = INSTALL $@
- cmd_modules_install = \
- mkdir -p $(2) ; \
- cp $@ $(2) ; \
- $(mod_strip_cmd) $(2)/$(notdir $@) ; \
- $(mod_sign_cmd) $(2)/$(notdir $@) $(patsubst %,|| true,$(KBUILD_EXTMOD)) ; \
- $(mod_compress_cmd) $(2)/$(notdir $@)
+quiet_cmd_none =
+ cmd_none = :
-# Modules built outside the kernel source tree go into extra by default
-INSTALL_MOD_DIR ?= extra
-ext-mod-dir = $(INSTALL_MOD_DIR)$(subst $(patsubst %/,%,$(KBUILD_EXTMOD)),,$(@D))
+#
+# Installation
+#
+quiet_cmd_install = INSTALL $@
+ cmd_install = mkdir -p $(dir $@); cp $< $@
+
+# Strip
+#
+# INSTALL_MOD_STRIP, if defined, will cause modules to be stripped after they
+# are installed. If INSTALL_MOD_STRIP is '1', then the default option
+# --strip-debug will be used. Otherwise, INSTALL_MOD_STRIP value will be used
+# as the options to the strip command.
+ifdef INSTALL_MOD_STRIP
+
+ifeq ($(INSTALL_MOD_STRIP),1)
+strip-option := --strip-debug
+else
+strip-option := $(INSTALL_MOD_STRIP)
+endif
+
+quiet_cmd_strip = STRIP $@
+ cmd_strip = $(STRIP) $(strip-option) $@
+
+else
+
+quiet_cmd_strip =
+ cmd_strip = :
+
+endif
+
+#
+# Signing
+# Don't stop modules_install even if we can't sign external modules.
+#
+ifeq ($(CONFIG_MODULE_SIG_ALL),y)
+quiet_cmd_sign = SIGN $@
+$(eval $(call config_filename,MODULE_SIG_KEY))
+ cmd_sign = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 $@ \
+ $(if $(KBUILD_EXTMOD),|| true)
+else
+quiet_cmd_sign :=
+ cmd_sign := :
+endif
+
+ifeq ($(modules_sign_only),)
+
+$(dst)/%.ko: $(extmod_prefix)%.ko FORCE
+ $(call cmd,install)
+ $(call cmd,strip)
+ $(call cmd,sign)
+
+else
+
+$(dst)/%.ko: FORCE
+ $(call cmd,sign)
+
+endif
+
+#
+# Compression
+#
+quiet_cmd_gzip = GZIP $@
+ cmd_gzip = $(KGZIP) -n -f $<
+quiet_cmd_xz = XZ $@
+ cmd_xz = $(XZ) --lzma2=dict=2MiB -f $<
+quiet_cmd_zstd = ZSTD $@
+ cmd_zstd = $(ZSTD) -T0 --rm -f -q $<
+
+$(dst)/%.ko.gz: $(dst)/%.ko FORCE
+ $(call cmd,gzip)
+
+$(dst)/%.ko.xz: $(dst)/%.ko FORCE
+ $(call cmd,xz)
-modinst_dir = $(if $(KBUILD_EXTMOD),$(ext-mod-dir),kernel/$(@D))
+$(dst)/%.ko.zst: $(dst)/%.ko FORCE
+ $(call cmd,zstd)
-$(modules):
- $(call cmd,modules_install,$(MODLIB)/$(modinst_dir))
+PHONY += FORCE
+FORCE:
.PHONY: $(PHONY)
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 066beffca09a..c383ba33d837 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -32,8 +32,6 @@
# Step 4 is solely used to allow module versioning in external modules,
# where the CRC of each module is retrieved from the Module.symvers file.
-# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined
-# symbols in the final module linking stage
# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
# This is solely useful to speed up test compiles
@@ -41,16 +39,15 @@ PHONY := __modpost
__modpost:
include include/config/auto.conf
-include scripts/Kbuild.include
+include $(srctree)/scripts/Kbuild.include
# for ld_flags
-include scripts/Makefile.lib
+include $(srctree)/scripts/Makefile.lib
MODPOST = scripts/mod/modpost \
$(if $(CONFIG_MODVERSIONS),-m) \
$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \
$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
- $(if $(KBUILD_MODPOST_WARN),-w) \
-o $@
ifdef MODPOST_VMLINUX
@@ -68,7 +65,20 @@ else
ifeq ($(KBUILD_EXTMOD),)
input-symdump := vmlinux.symvers
-output-symdump := Module.symvers
+output-symdump := modules-only.symvers
+
+quiet_cmd_cat = GEN $@
+ cmd_cat = cat $(real-prereqs) > $@
+
+ifneq ($(wildcard vmlinux.symvers),)
+
+__modpost: Module.symvers
+Module.symvers: vmlinux.symvers modules-only.symvers FORCE
+ $(call if_changed,cat)
+
+targets += Module.symvers
+
+endif
else
@@ -88,9 +98,11 @@ output-symdump := $(KBUILD_EXTMOD)/Module.symvers
endif
+existing-input-symdump := $(wildcard $(input-symdump))
+
# modpost options for modules (both in-kernel and external)
MODPOST += \
- $(addprefix -i ,$(wildcard $(input-symdump))) \
+ $(addprefix -i ,$(existing-input-symdump)) \
$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \
$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N)
@@ -104,6 +116,7 @@ VPATH :=
$(input-symdump):
@echo >&2 'WARNING: Symbol version dump "$@" is missing.'
@echo >&2 ' Modules may not have dependencies or modversions.'
+ @echo >&2 ' You may get many unresolved symbol warnings.'
ifdef CONFIG_LTO_CLANG
# With CONFIG_LTO_CLANG, .o files might be LLVM bitcode, so we need to run
@@ -123,6 +136,11 @@ endif
modules := $(sort $(shell cat $(MODORDER)))
+# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined symbols
+ifneq ($(KBUILD_MODPOST_WARN)$(filter-out $(existing-input-symdump), $(input-symdump)),)
+MODPOST += -w
+endif
+
# Read out modules.order to pass in modpost.
# Otherwise, allmodconfig would fail with "Argument list too long".
quiet_cmd_modpost = MODPOST $@
diff --git a/scripts/Makefile.modsign b/scripts/Makefile.modsign
deleted file mode 100644
index d7325cefe709..000000000000
--- a/scripts/Makefile.modsign
+++ /dev/null
@@ -1,29 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-# ==========================================================================
-# Signing modules
-# ==========================================================================
-
-PHONY := __modsign
-__modsign:
-
-include scripts/Kbuild.include
-
-modules := $(sort $(shell cat modules.order))
-
-PHONY += $(modules)
-__modsign: $(modules)
- @:
-
-quiet_cmd_sign_ko = SIGN [M] $(2)/$(notdir $@)
- cmd_sign_ko = $(mod_sign_cmd) $(2)/$(notdir $@)
-
-# Modules built outside the kernel source tree go into extra by default
-INSTALL_MOD_DIR ?= extra
-ext-mod-dir = $(INSTALL_MOD_DIR)$(subst $(patsubst %/,%,$(KBUILD_EXTMOD)),,$(@D))
-
-modinst_dir = $(if $(KBUILD_EXTMOD),$(ext-mod-dir),kernel/$(@D))
-
-$(modules):
- $(call cmd,sign_ko,$(MODLIB)/$(modinst_dir))
-
-.PHONY: $(PHONY)
diff --git a/scripts/Makefile.package b/scripts/Makefile.package
index f952fb64789d..b74c65284fb2 100644
--- a/scripts/Makefile.package
+++ b/scripts/Makefile.package
@@ -25,7 +25,7 @@ include $(srctree)/scripts/Kbuild.include
# Remove hyphens since they have special meaning in RPM filenames
KERNELPATH := kernel-$(subst -,_,$(KERNELRELEASE))
-KDEB_SOURCENAME ?= linux-$(KERNELRELEASE)
+KDEB_SOURCENAME ?= linux-upstream
KBUILD_PKG_ROOTCMD ?="fakeroot -u"
export KDEB_SOURCENAME
# Include only those top-level files that are needed by make, plus the GPL copy
diff --git a/scripts/as-version.sh b/scripts/as-version.sh
new file mode 100755
index 000000000000..8b9410e329df
--- /dev/null
+++ b/scripts/as-version.sh
@@ -0,0 +1,82 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Print the assembler name and its version in a 5 or 6-digit form.
+# Also, perform the minimum version check.
+# (If it is the integrated assembler, return 0 as the version, and
+# skip the version check.)
+
+set -e
+
+# Convert the version string x.y.z to a canonical 5 or 6-digit form.
+get_canonical_version()
+{
+ IFS=.
+ set -- $1
+
+ # If the 2nd or 3rd field is missing, fill it with a zero.
+ #
+ # The 4th field, if present, is ignored.
+ # This occurs in development snapshots as in 2.35.1.20201116
+ echo $((10000 * $1 + 100 * ${2:-0} + ${3:-0}))
+}
+
+# Clang fails to handle -Wa,--version unless -no-integrated-as is given.
+# We check -(f)integrated-as, expecting it is explicitly passed in for the
+# integrated assembler case.
+check_integrated_as()
+{
+ while [ $# -gt 0 ]; do
+ if [ "$1" = -integrated-as -o "$1" = -fintegrated-as ]; then
+ # For the intergrated assembler, we do not check the
+ # version here. It is the same as the clang version, and
+ # it has been already checked by scripts/cc-version.sh.
+ echo LLVM 0
+ exit 0
+ fi
+ shift
+ done
+}
+
+check_integrated_as "$@"
+
+orig_args="$@"
+
+# Get the first line of the --version output.
+IFS='
+'
+set -- $(LC_ALL=C "$@" -Wa,--version -c -x assembler /dev/null -o /dev/null 2>/dev/null)
+
+# Split the line on spaces.
+IFS=' '
+set -- $1
+
+min_tool_version=$(dirname $0)/min-tool-version.sh
+
+if [ "$1" = GNU -a "$2" = assembler ]; then
+ shift $(($# - 1))
+ version=$1
+ min_version=$($min_tool_version binutils)
+ name=GNU
+else
+ echo "$orig_args: unknown assembler invoked" >&2
+ exit 1
+fi
+
+# Some distributions append a package release number, as in 2.34-4.fc32
+# Trim the hyphen and any characters that follow.
+version=${version%-*}
+
+cversion=$(get_canonical_version $version)
+min_cversion=$(get_canonical_version $min_version)
+
+if [ "$cversion" -lt "$min_cversion" ]; then
+ echo >&2 "***"
+ echo >&2 "*** Assembler is too old."
+ echo >&2 "*** Your $name assembler version: $version"
+ echo >&2 "*** Minimum $name assembler version: $min_version"
+ echo >&2 "***"
+ exit 1
+fi
+
+echo $name $cversion
diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
index d98540552941..44e887cff49b 100644
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -34,7 +34,7 @@
* the config symbols are rebuilt.
*
* So if the user changes his CONFIG_HIS_DRIVER option, only the objects
- * which depend on "include/config/his/driver.h" will be rebuilt,
+ * which depend on "include/config/HIS_DRIVER" will be rebuilt,
* so most likely only his driver ;-)
*
* The idea above dates, by the way, back to Michael E Chastain, AFAIK.
@@ -74,7 +74,7 @@
*
* and then basically copies the .<target>.d file to stdout, in the
* process filtering out the dependency on autoconf.h and adding
- * dependencies on include/config/my/option.h for every
+ * dependencies on include/config/MY_OPTION for every
* CONFIG_MY_OPTION encountered in any of the prerequisites.
*
* We don't even try to really parse the header files, but
@@ -107,8 +107,8 @@ static void usage(void)
/*
* In the intended usage of this program, the stdout is redirected to .*.cmd
- * files. The return value of printf() and putchar() must be checked to catch
- * any error, e.g. "No space left on device".
+ * files. The return value of printf() must be checked to catch any error,
+ * e.g. "No space left on device".
*/
static void xprintf(const char *format, ...)
{
@@ -124,38 +124,6 @@ static void xprintf(const char *format, ...)
va_end(ap);
}
-static void xputchar(int c)
-{
- int ret;
-
- ret = putchar(c);
- if (ret == EOF) {
- perror("fixdep");
- exit(1);
- }
-}
-
-/*
- * Print out a dependency path from a symbol name
- */
-static void print_dep(const char *m, int slen, const char *dir)
-{
- int c, prev_c = '/', i;
-
- xprintf(" $(wildcard %s/", dir);
- for (i = 0; i < slen; i++) {
- c = m[i];
- if (c == '_')
- c = '/';
- else
- c = tolower(c);
- if (c != '/' || prev_c != '/')
- xputchar(c);
- prev_c = c;
- }
- xprintf(".h) \\\n");
-}
-
struct item {
struct item *next;
unsigned int len;
@@ -220,7 +188,8 @@ static void use_config(const char *m, int slen)
return;
define_config(m, slen, hash);
- print_dep(m, slen, "include/config");
+ /* Print out a dependency path from a symbol name. */
+ xprintf(" $(wildcard include/config/%.*s) \\\n", slen, m);
}
/* test if s ends in sub */
diff --git a/scripts/cc-version.sh b/scripts/cc-version.sh
index 3f2ee885b116..f1952c522466 100755
--- a/scripts/cc-version.sh
+++ b/scripts/cc-version.sh
@@ -6,18 +6,6 @@
set -e
-# When you raise the minimum compiler version, please update
-# Documentation/process/changes.rst as well.
-gcc_min_version=4.9.0
-clang_min_version=10.0.1
-icc_min_version=16.0.3 # temporary
-
-# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293
-# https://lore.kernel.org/r/20210107111841.GN1551@shell.armlinux.org.uk
-if [ "$SRCARCH" = arm64 ]; then
- gcc_min_version=5.1.0
-fi
-
# Print the compiler name and some version components.
get_compiler_info()
{
@@ -48,18 +36,20 @@ set -- $(get_compiler_info "$@")
name=$1
+min_tool_version=$(dirname $0)/min-tool-version.sh
+
case "$name" in
GCC)
version=$2.$3.$4
- min_version=$gcc_min_version
+ min_version=$($min_tool_version gcc)
;;
Clang)
version=$2.$3.$4
- min_version=$clang_min_version
+ min_version=$($min_tool_version llvm)
;;
ICC)
version=$(($2 / 100)).$(($2 % 100)).$3
- min_version=$icc_min_version
+ min_version=$($min_tool_version icc)
;;
*)
echo "$orig_args: unknown compiler" >&2
diff --git a/scripts/dummy-tools/gcc b/scripts/dummy-tools/gcc
index 39e65fee59bd..f6d543725f1e 100755
--- a/scripts/dummy-tools/gcc
+++ b/scripts/dummy-tools/gcc
@@ -67,6 +67,12 @@ if arg_contain -E "$@"; then
fi
fi
+# To set CONFIG_AS_IS_GNU
+if arg_contain -Wa,--version "$@"; then
+ echo "GNU assembler (scripts/dummy-tools) 2.50"
+ exit 0
+fi
+
if arg_contain -S "$@"; then
# For scripts/gcc-x86-*-has-stack-protector.sh
if arg_contain -fstack-protector "$@"; then
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 2568dbe16ed6..c7b7e1c62a9c 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -130,19 +130,14 @@ static size_t depfile_prefix_len;
static int conf_touch_dep(const char *name)
{
int fd, ret;
- const char *s;
- char *d, c;
+ char *d;
- /* check overflow: prefix + name + ".h" + '\0' must fit in buffer. */
- if (depfile_prefix_len + strlen(name) + 3 > sizeof(depfile_path))
+ /* check overflow: prefix + name + '\0' must fit in buffer. */
+ if (depfile_prefix_len + strlen(name) + 1 > sizeof(depfile_path))
return -1;
d = depfile_path + depfile_prefix_len;
- s = name;
-
- while ((c = *s++))
- *d++ = (c == '_') ? '/' : tolower(c);
- strcpy(d, ".h");
+ strcpy(d, name);
/* Assume directory path already exists. */
fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
@@ -465,7 +460,7 @@ load:
* Reading from include/config/auto.conf
* If CONFIG_FOO previously existed in
* auto.conf but it is missing now,
- * include/config/foo.h must be touched.
+ * include/config/FOO must be touched.
*/
conf_touch_dep(line + strlen(CONFIG_));
else
diff --git a/scripts/ld-version.sh b/scripts/ld-version.sh
index 1bf3aadde9de..a78b804b680c 100755
--- a/scripts/ld-version.sh
+++ b/scripts/ld-version.sh
@@ -6,11 +6,6 @@
set -e
-# When you raise the minimum linker version, please update
-# Documentation/process/changes.rst as well.
-bfd_min_version=2.23.0
-lld_min_version=10.0.1
-
# Convert the version string x.y.z to a canonical 5 or 6-digit form.
get_canonical_version()
{
@@ -35,10 +30,12 @@ set -- $(LC_ALL=C "$@" --version)
IFS=' '
set -- $1
+min_tool_version=$(dirname $0)/min-tool-version.sh
+
if [ "$1" = GNU -a "$2" = ld ]; then
shift $(($# - 1))
version=$1
- min_version=$bfd_min_version
+ min_version=$($min_tool_version binutils)
name=BFD
disp_name="GNU ld"
elif [ "$1" = GNU -a "$2" = gold ]; then
@@ -51,7 +48,7 @@ else
if [ "$1" = LLD ]; then
version=$2
- min_version=$lld_min_version
+ min_version=$($min_tool_version llvm)
name=LLD
disp_name=LLD
else
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 667aacb9261c..7d112681f332 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -155,6 +155,7 @@ vmlinux_link()
local output=${1}
local objects
local strip_debug
+ local map_option
info LD ${output}
@@ -166,6 +167,10 @@ vmlinux_link()
strip_debug=-Wl,--strip-debug
fi
+ if [ -n "${CONFIG_VMLINUX_MAP}" ]; then
+ map_option="-Map=${output}.map"
+ fi
+
if [ "${SRCARCH}" != "um" ]; then
if [ -n "${CONFIG_LTO_CLANG}" ]; then
# Use vmlinux.o instead of performing the slow LTO
@@ -187,6 +192,7 @@ vmlinux_link()
${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \
${strip_debug#-Wl,} \
-o ${output} \
+ ${map_option} \
-T ${lds} ${objects}
else
objects="-Wl,--whole-archive \
@@ -200,6 +206,7 @@ vmlinux_link()
${CC} ${CFLAGS_vmlinux} \
${strip_debug} \
-o ${output} \
+ ${map_option:+-Wl,${map_option}} \
-Wl,-T,${lds} \
${objects} \
-lutil -lrt -lpthread
@@ -308,7 +315,9 @@ cleanup()
rm -f .tmp_vmlinux*
rm -f System.map
rm -f vmlinux
+ rm -f vmlinux.map
rm -f vmlinux.o
+ rm -f .vmlinux.d
}
on_exit()
@@ -446,3 +455,6 @@ if [ -n "${CONFIG_KALLSYMS}" ]; then
exit 1
fi
fi
+
+# For fixdep
+echo "vmlinux: $0" > .vmlinux.d
diff --git a/scripts/min-tool-version.sh b/scripts/min-tool-version.sh
new file mode 100755
index 000000000000..d22cf91212b0
--- /dev/null
+++ b/scripts/min-tool-version.sh
@@ -0,0 +1,39 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Print the minimum supported version of the given tool.
+# When you raise the minimum version, please update
+# Documentation/process/changes.rst as well.
+
+set -e
+
+if [ $# != 1 ]; then
+ echo "Usage: $0 toolname" >&2
+ exit 1
+fi
+
+case "$1" in
+binutils)
+ echo 2.23.0
+ ;;
+gcc)
+ # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293
+ # https://lore.kernel.org/r/20210107111841.GN1551@shell.armlinux.org.uk
+ if [ "$SRCARCH" = arm64 ]; then
+ echo 5.1.0
+ else
+ echo 4.9.0
+ fi
+ ;;
+icc)
+ # temporary
+ echo 16.0.3
+ ;;
+llvm)
+ echo 10.0.1
+ ;;
+*)
+ echo "$1: unknown tool" >&2
+ exit 1
+ ;;
+esac
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 24725e50c7b4..3e623ccc020b 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -23,8 +23,6 @@
/* Are we using CONFIG_MODVERSIONS? */
static int modversions = 0;
-/* Warn about undefined symbols? (do so if we have vmlinux) */
-static int have_vmlinux = 0;
/* Is CONFIG_MODULE_SRCVERSION_ALL set? */
static int all_versions = 0;
/* If we are modposting external module set to 1 */
@@ -41,6 +39,13 @@ static int allow_missing_ns_imports;
static bool error_occurred;
+/*
+ * Cut off the warnings when there are too many. This typically occurs when
+ * vmlinux is missing. ('make modules' without building vmlinux.)
+ */
+#define MAX_UNRESOLVED_REPORTS 10
+static unsigned int nr_unresolved;
+
enum export {
export_plain,
export_gpl,
@@ -177,9 +182,6 @@ static struct module *new_module(const char *modname)
mod->next = modules;
modules = mod;
- if (mod->is_vmlinux)
- have_vmlinux = 1;
-
return mod;
}
@@ -202,7 +204,7 @@ struct symbol {
static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
-/* This is based on the hash agorithm from gdbm, via tdb */
+/* This is based on the hash algorithm from gdbm, via tdb */
static inline unsigned int tdb_hash(const char *name)
{
unsigned value; /* Used to compute the hash value. */
@@ -985,7 +987,7 @@ enum mismatch {
};
/**
- * Describe how to match sections on different criterias:
+ * Describe how to match sections on different criteria:
*
* @fromsec: Array of sections to be matched.
*
@@ -993,12 +995,12 @@ enum mismatch {
* this array is forbidden (black-list). Can be empty.
*
* @good_tosec: Relocations applied to a section in @fromsec must be
- * targetting sections in this array (white-list). Can be empty.
+ * targeting sections in this array (white-list). Can be empty.
*
* @mismatch: Type of mismatch.
*
* @symbol_white_list: Do not match a relocation to a symbol in this list
- * even if it is targetting a section in @bad_to_sec.
+ * even if it is targeting a section in @bad_to_sec.
*
* @handler: Specific handler to call when a match is found. If NULL,
* default_mismatch_handler() will be called.
@@ -2141,7 +2143,7 @@ static void check_exports(struct module *mod)
const char *basename;
exp = find_symbol(s->name);
if (!exp || exp->module == mod) {
- if (have_vmlinux && !s->weak)
+ if (!s->weak && nr_unresolved++ < MAX_UNRESOLVED_REPORTS)
modpost_log(warn_unresolved ? LOG_WARN : LOG_ERROR,
"\"%s\" [%s.ko] undefined!\n",
s->name, mod->name);
@@ -2191,10 +2193,12 @@ static void add_header(struct buffer *b, struct module *mod)
*/
buf_printf(b, "#define INCLUDE_VERMAGIC\n");
buf_printf(b, "#include <linux/build-salt.h>\n");
+ buf_printf(b, "#include <linux/elfnote-lto.h>\n");
buf_printf(b, "#include <linux/vermagic.h>\n");
buf_printf(b, "#include <linux/compiler.h>\n");
buf_printf(b, "\n");
buf_printf(b, "BUILD_SALT;\n");
+ buf_printf(b, "BUILD_LTO_INFO;\n");
buf_printf(b, "\n");
buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
buf_printf(b, "MODULE_INFO(name, KBUILD_MODNAME);\n");
@@ -2423,19 +2427,6 @@ fail:
fatal("parse error in symbol dump file\n");
}
-/* For normal builds always dump all symbols.
- * For external modules only dump symbols
- * that are not read from kernel Module.symvers.
- **/
-static int dump_sym(struct symbol *sym)
-{
- if (!external_module)
- return 1;
- if (sym->module->from_dump)
- return 0;
- return 1;
-}
-
static void write_dump(const char *fname)
{
struct buffer buf = { };
@@ -2446,7 +2437,7 @@ static void write_dump(const char *fname)
for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
symbol = symbolhash[n];
while (symbol) {
- if (dump_sym(symbol)) {
+ if (!symbol->module->from_dump) {
namespace = symbol->namespace;
buf_printf(&buf, "0x%08x\t%s\t%s\t%s\t%s\n",
symbol->crc, symbol->name,
@@ -2558,13 +2549,6 @@ int main(int argc, char **argv)
if (files_source)
read_symbols_from_files(files_source);
- /*
- * When there's no vmlinux, don't print warnings about
- * unresolved symbols (since there'll be too many ;)
- */
- if (!have_vmlinux)
- warn("Symbol info of vmlinux is missing. Unresolved symbol check will be entirely skipped.\n");
-
for (mod = modules; mod; mod = mod->next) {
char fname[PATH_MAX];
@@ -2608,6 +2592,10 @@ int main(int argc, char **argv)
}
}
+ if (nr_unresolved > MAX_UNRESOLVED_REPORTS)
+ warn("suppressed %u unresolved symbol warnings because there were too many)\n",
+ nr_unresolved - MAX_UNRESOLVED_REPORTS);
+
free(buf.p);
return error_occurred ? 1 : 0;
diff --git a/scripts/modules-check.sh b/scripts/modules-check.sh
index 43de226071ae..e06327722263 100755
--- a/scripts/modules-check.sh
+++ b/scripts/modules-check.sh
@@ -13,10 +13,10 @@ exit_code=0
# Check uniqueness of module names
check_same_name_modules()
{
- for m in $(sed 's:.*/::' $1 | sort | uniq -d)
+ for m in $(sed 's:.*/::' "$1" | sort | uniq -d)
do
echo "error: the following would cause module name conflict:" >&2
- sed -n "/\/$m/s:^: :p" modules.order >&2
+ sed -n "/\/$m/s:^: :p" "$1" >&2
exit_code=1
done
}
diff --git a/scripts/test_dwarf5_support.sh b/scripts/test_dwarf5_support.sh
deleted file mode 100755
index c46e2456b47a..000000000000
--- a/scripts/test_dwarf5_support.sh
+++ /dev/null
@@ -1,8 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0
-
-# Test that the assembler doesn't need -Wa,-gdwarf-5 when presented with DWARF
-# v5 input, such as `.file 0` and `md5 0x00`. Should be fixed in GNU binutils
-# 2.35.2. https://sourceware.org/bugzilla/show_bug.cgi?id=25611
-echo '.file 0 "filename" md5 0x7a0b65214090b6693bd1dc24dd248245' | \
- $* -gdwarf-5 -Wno-unused-command-line-argument -c -x assembler -o /dev/null -