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Kbuild updates for v5.7

Browse Source 
[Build system]
 
  - add CONFIG_UNUSED_KSYMS_WHITELIST, which will be useful to define
    a fixed set of export symbols for Generic Kernel Image (GKI)
 
  - allow to run 'make dt_binding_check' without .config
 
  - use full schema for checking DT examples in *.yaml files
 
  - make modpost fail for missing MODULE_IMPORT_NS(), which makes more
    sense because we know the produced modules are never loadable
 
  - Remove unused 'AS' variable
 
 [Kconfig]
 
  - sanitize DEFCONFIG_LIST, and remove ARCH_DEFCONFIG from Kconfig files
 
  - relax the 'imply' behavior so that symbols implied by y can become m
 
  - make 'imply' obey 'depends on' in order to make 'imply' really weak
 
 [Misc]
 
  - add documentation on building the kernel with Clang/LLVM
 
  - revive __HAVE_ARCH_STRLEN for 32bit sparc to use optimized strlen()
 
  - fix warning from deb-pkg builds when CONFIG_DEBUG_INFO=n
 
  - various script and Makefile cleanups
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Merge tag 'kbuild-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:
 "Build system:

   - add CONFIG_UNUSED_KSYMS_WHITELIST, which will be useful to define a
     fixed set of export symbols for Generic Kernel Image (GKI)

   - allow to run 'make dt_binding_check' without .config

   - use full schema for checking DT examples in *.yaml files

   - make modpost fail for missing MODULE_IMPORT_NS(), which makes more
     sense because we know the produced modules are never loadable

   - Remove unused 'AS' variable

  Kconfig:

   - sanitize DEFCONFIG_LIST, and remove ARCH_DEFCONFIG from Kconfig
     files

   - relax the 'imply' behavior so that symbols implied by 'y' can
     become 'm'

   - make 'imply' obey 'depends on' in order to make 'imply' really weak

  Misc:

   - add documentation on building the kernel with Clang/LLVM

   - revive __HAVE_ARCH_STRLEN for 32bit sparc to use optimized strlen()

   - fix warning from deb-pkg builds when CONFIG_DEBUG_INFO=n

   - various script and Makefile cleanups"

* tag 'kbuild-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (34 commits)
  Makefile: Update kselftest help information
  kbuild: deb-pkg: fix warning when CONFIG_DEBUG_INFO is unset
  kbuild: add outputmakefile to no-dot-config-targets
  kbuild: remove AS variable
  net: wan: wanxl: refactor the firmware rebuild rule
  net: wan: wanxl: use $(M68KCC) instead of $(M68KAS) for rebuilding firmware
  net: wan: wanxl: use allow to pass CROSS_COMPILE_M68k for rebuilding firmware
  kbuild: add comment about grouped target
  kbuild: add -Wall to KBUILD_HOSTCXXFLAGS
  kconfig: remove unused variable in qconf.cc
  sparc: revive __HAVE_ARCH_STRLEN for 32bit sparc
  kbuild: refactor Makefile.dtbinst more
  kbuild: compute the dtbs_install destination more simply
  Makefile: disallow data races on gcc-10 as well
  kconfig: make 'imply' obey the direct dependency
  kconfig: allow symbols implied by y to become m
  net: drop_monitor: use IS_REACHABLE() to guard net_dm_hw_report()
  modpost: return error if module is missing ns imports and MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS=n
  modpost: rework and consolidate logging interface
  kbuild: allow to run dt_binding_check without kernel configuration
  ...
This commit is contained in:
Linus Torvalds 2020-03-31 16:03:39 -07:00
commit 5b67fbfc32
35 changed files with 357 additions and 201 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/Makefile
View File

@ -2,7 +2,8 @@
# Makefile for Sphinx documentation
#
subdir-y := devicetree/bindings/
# for cleaning
subdir- := devicetree/bindings
# Check for broken documentation file references
ifeq ($(CONFIG_WARN_MISSING_DOCUMENTS),y)

2
Documentation/devicetree/bindings/.gitignore vendored
View File

@ -1,2 +1,2 @@
*.example.dts
processed-schema.yaml
processed-schema*.yaml

32
Documentation/devicetree/bindings/Makefile
View File

@ -2,7 +2,6 @@
DT_DOC_CHECKER ?= dt-doc-validate
DT_EXTRACT_EX ?= dt-extract-example
DT_MK_SCHEMA ?= dt-mk-schema
DT_MK_SCHEMA_FLAGS := $(if $(DT_SCHEMA_FILES), -u)
quiet_cmd_chk_binding = CHKDT $(patsubst $(srctree)/%,%,$<)
cmd_chk_binding = $(DT_DOC_CHECKER) -u $(srctree)/$(src) $< ; \
@ -11,26 +10,35 @@ quiet_cmd_chk_binding = CHKDT $(patsubst $(srctree)/%,%,$<)
$(obj)/%.example.dts: $(src)/%.yaml FORCE
$(call if_changed,chk_binding)
DT_TMP_SCHEMA := processed-schema.yaml
# Use full schemas when checking %.example.dts
DT_TMP_SCHEMA := $(obj)/processed-schema-examples.yaml
quiet_cmd_mk_schema = SCHEMA $@
cmd_mk_schema = $(DT_MK_SCHEMA) $(DT_MK_SCHEMA_FLAGS) -o $@ $(real-prereqs)
DT_DOCS = $(shell \
DT_DOCS = $(addprefix $(src)/, \
$(shell \
cd $(srctree)/$(src) && \
find * \( -name '*.yaml' ! \
-name $(DT_TMP_SCHEMA) ! \
-name 'processed-schema*' ! \
-name '*.example.dt.yaml' \) \
)
))
DT_SCHEMA_FILES ?= $(addprefix $(src)/,$(DT_DOCS))
DT_SCHEMA_FILES ?= $(DT_DOCS)
ifeq ($(CHECK_DTBS),)
extra-y += $(patsubst $(src)/%.yaml,%.example.dts, $(DT_SCHEMA_FILES))
extra-y += $(patsubst $(src)/%.yaml,%.example.dt.yaml, $(DT_SCHEMA_FILES))
endif
extra-$(CHECK_DT_BINDING) += $(patsubst $(src)/%.yaml,%.example.dts, $(DT_SCHEMA_FILES))
extra-$(CHECK_DT_BINDING) += $(patsubst $(src)/%.yaml,%.example.dt.yaml, $(DT_SCHEMA_FILES))
extra-$(CHECK_DT_BINDING) += processed-schema-examples.yaml
$(obj)/$(DT_TMP_SCHEMA): $(DT_SCHEMA_FILES) FORCE
override DTC_FLAGS := \
-Wno-avoid_unnecessary_addr_size \
-Wno-graph_child_address
$(obj)/processed-schema-examples.yaml: $(DT_DOCS) FORCE
$(call if_changed,mk_schema)
extra-y += $(DT_TMP_SCHEMA)
$(obj)/processed-schema.yaml: DT_MK_SCHEMA_FLAGS := -u
$(obj)/processed-schema.yaml: $(DT_SCHEMA_FILES) FORCE
$(call if_changed,mk_schema)
extra-y += processed-schema.yaml

4
Documentation/devicetree/writing-schema.rst
View File

@ -147,6 +147,10 @@ Note that ``dtbs_check`` will skip any binding schema files with errors. It is
necessary to use ``dt_binding_check`` to get all the validation errors in the
binding schema files.
It is possible to run both in a single command::
make dt_binding_check dtbs_check
It is also possible to run checks with a single schema file by setting the
``DT_SCHEMA_FILES`` variable to a specific schema file.

1
Documentation/kbuild/index.rst
View File

@ -20,6 +20,7 @@ Kernel Build System
issues
reproducible-builds
gcc-plugins
llvm
.. only:: subproject and html

27
Documentation/kbuild/kconfig-language.rst
View File

@ -159,11 +159,11 @@ applicable everywhere (see syntax).
Given the following example::
config FOO
tristate
tristate "foo"
imply BAZ
config BAZ
tristate
tristate "baz"
depends on BAR
The following values are possible:
@ -173,7 +173,10 @@ applicable everywhere (see syntax).
=== === ============= ==============
n y n N/m/y
m y m M/y/n
y y y Y/n
y y y Y/m/n
n m n N/m
m m m M/n
y m n M/n
y n * N
=== === ============= ==============
@ -181,6 +184,24 @@ applicable everywhere (see syntax).
ability to hook into a secondary subsystem while allowing the user to
configure that subsystem out without also having to unset these drivers.
Note: If the combination of FOO=y and BAR=m causes a link error,
you can guard the function call with IS_REACHABLE()::
foo_init()
{
if (IS_REACHABLE(CONFIG_BAZ))
baz_register(&foo);
...
}
Note: If the feature provided by BAZ is highly desirable for FOO,
FOO should imply not only BAZ, but also its dependency BAR::
config FOO
tristate "foo"
imply BAR
imply BAZ
- limiting menu display: "visible if" <expr>
This attribute is only applicable to menu blocks, if the condition is

80
Documentation/kbuild/llvm.rst Normal file
View File

@ -0,0 +1,80 @@
==============================
Building Linux with Clang/LLVM
==============================
This document covers how to build the Linux kernel with Clang and LLVM
utilities.
About
-----
The Linux kernel has always traditionally been compiled with GNU toolchains
such as GCC and binutils. Ongoing work has allowed for `Clang
<https://clang.llvm.org/>`_ and `LLVM <https://llvm.org/>`_ utilities to be
used as viable substitutes. Distributions such as `Android
<https://www.android.com/>`_, `ChromeOS
<https://www.chromium.org/chromium-os>`_, and `OpenMandriva
<https://www.openmandriva.org/>`_ use Clang built kernels. `LLVM is a
collection of toolchain components implemented in terms of C++ objects
<https://www.aosabook.org/en/llvm.html>`_. Clang is a front-end to LLVM that
supports C and the GNU C extensions required by the kernel, and is pronounced
"klang," not "see-lang."
Clang
-----
The compiler used can be swapped out via `CC=` command line argument to `make`.
`CC=` should be set when selecting a config and during a build.
make CC=clang defconfig
make CC=clang
Cross Compiling
---------------
A single Clang compiler binary will typically contain all supported backends,
which can help simplify cross compiling.
ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make CC=clang
`CROSS_COMPILE` is not used to prefix the Clang compiler binary, instead
`CROSS_COMPILE` is used to set a command line flag: `--target <triple>`. For
example:
clang --target aarch64-linux-gnu foo.c
LLVM Utilities
--------------
LLVM has substitutes for GNU binutils utilities. These can be invoked as
additional parameters to `make`.
make CC=clang AS=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\
OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump OBJSIZE=llvm-objsize \\
READELF=llvm-readelf HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar \\
HOSTLD=ld.lld
Getting Help
------------
- `Website <https://clangbuiltlinux.github.io/>`_
- `Mailing List <https://groups.google.com/forum/#!forum/clang-built-linux>`_: <clang-built-linux@googlegroups.com>
- `Issue Tracker <https://github.com/ClangBuiltLinux/linux/issues>`_
- IRC: #clangbuiltlinux on chat.freenode.net
- `Telegram <https://t.me/ClangBuiltLinux>`_: @ClangBuiltLinux
- `Wiki <https://github.com/ClangBuiltLinux/linux/wiki>`_
- `Beginner Bugs <https://github.com/ClangBuiltLinux/linux/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22>`_
Getting LLVM
-------------
- http://releases.llvm.org/download.html
- https://github.com/llvm/llvm-project
- https://llvm.org/docs/GettingStarted.html
- https://llvm.org/docs/CMake.html
- https://apt.llvm.org/
- https://www.archlinux.org/packages/extra/x86_64/llvm/
- https://github.com/ClangBuiltLinux/tc-build
- https://github.com/ClangBuiltLinux/linux/wiki/Building-Clang-from-source
- https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86/

1
MAINTAINERS
View File

@ -4139,6 +4139,7 @@ B: https://github.com/ClangBuiltLinux/linux/issues
C: irc://chat.freenode.net/clangbuiltlinux
S: Supported
K: \b(?i:clang|llvm)\b
F: Documentation/kbuild/llvm.rst
CLEANCACHE API
M: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

49
Makefile
View File

@ -255,7 +255,8 @@ clean-targets := %clean mrproper cleandocs
no-dot-config-targets := $(clean-targets) \
cscope gtags TAGS tags help% %docs check% coccicheck \
$(version_h) headers headers_% archheaders archscripts \
%asm-generic kernelversion %src-pkg
%asm-generic kernelversion %src-pkg dt_binding_check \
outputmakefile
no-sync-config-targets := $(no-dot-config-targets) install %install \
kernelrelease
single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
@ -388,6 +389,9 @@ endif
KCONFIG_CONFIG ?= .config
export KCONFIG_CONFIG
# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
export KBUILD_DEFCONFIG := defconfig
# SHELL used by kbuild
CONFIG_SHELL := sh
@ -400,12 +404,11 @@ HOSTCXX = g++
KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
$(HOSTCFLAGS)
KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
# Make variables (CC, etc...)
AS = $(CROSS_COMPILE)as
LD = $(CROSS_COMPILE)ld
CC = $(CROSS_COMPILE)gcc
CPP = $(CC) -E
@ -472,7 +475,7 @@ KBUILD_LDFLAGS :=
GCC_PLUGINS_CFLAGS :=
CLANG_FLAGS :=
export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
@ -535,7 +538,7 @@ endif
ifneq ($(GCC_TOOLCHAIN),)
CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
endif
ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
ifeq ($(if $(AS),$(shell $(AS) --version 2>&1 | head -n 1 | grep clang)),)
CLANG_FLAGS += -no-integrated-as
endif
CLANG_FLAGS += -Werror=unknown-warning-option
@ -674,6 +677,7 @@ $(KCONFIG_CONFIG):
#
# This exploits the 'multi-target pattern rule' trick.
# The syncconfig should be executed only once to make all the targets.
# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
%/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG)
$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
else # !may-sync-config
@ -714,6 +718,7 @@ endif
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
include scripts/Makefile.kcov
include scripts/Makefile.gcc-plugins
@ -729,7 +734,7 @@ KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
endif
ifneq ($(CONFIG_FRAME_WARN),0)
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
endif
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
@ -1063,9 +1068,12 @@ endif
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
quiet_cmd_autoksyms_h = GEN $@
cmd_autoksyms_h = mkdir -p $(dir $@); \
$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
$(autoksyms_h):
$(Q)mkdir -p $(dir $@)
$(Q)touch $@
$(call cmd,autoksyms_h)
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
@ -1240,14 +1248,18 @@ ifneq ($(dtstree),)
$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
PHONY += dtbs dtbs_install dtbs_check
dtbs dtbs_check: include/config/kernel.release scripts_dtc
dtbs: include/config/kernel.release scripts_dtc
$(Q)$(MAKE) $(build)=$(dtstree)
dtbs_check: export CHECK_DTBS=1
dtbs_check: dt_binding_check
ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
export CHECK_DTBS=y
dtbs: dt_binding_check
endif
dtbs_check: dtbs
dtbs_install:
$(Q)$(MAKE) $(dtbinst)=$(dtstree)
$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
ifdef CONFIG_OF_EARLY_FLATTREE
all: dtbs
@ -1259,6 +1271,10 @@ PHONY += scripts_dtc
scripts_dtc: scripts_basic
$(Q)$(MAKE) $(build)=scripts/dtc
ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
export CHECK_DT_BINDING=y
endif
PHONY += dt_binding_check
dt_binding_check: scripts_dtc
$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
@ -1470,12 +1486,15 @@ help:
@echo ' nsdeps - Generate missing symbol namespace dependencies'
@echo ''
@echo 'Kernel selftest:'
@echo ' kselftest - Build and run kernel selftest (run as root)'
@echo ' kselftest - Build and run kernel selftest'
@echo ' Build, install, and boot kernel before'
@echo ' running kselftest on it'
@echo ' Run as root for full coverage'
@echo ' kselftest-all - Build kernel selftest'
@echo ' kselftest-install - Build and install kernel selftest'
@echo ' kselftest-clean - Remove all generated kselftest files'
@echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
@echo ' .config.'
@echo ' kselftest-merge - Merge all the config dependencies of'
@echo ' kselftest to existing .config.'
@echo ''
@$(if $(dtstree), \
echo 'Devicetree:'; \

5
arch/sh/Kconfig
View File

@ -87,11 +87,6 @@ config SUPERH64
select HAVE_EXIT_THREAD
select KALLSYMS
config ARCH_DEFCONFIG
string
default "arch/sh/configs/shx3_defconfig" if SUPERH32
default "arch/sh/configs/cayman_defconfig" if SUPERH64
config GENERIC_BUG
def_bool y
depends on BUG && SUPERH32

5
arch/sparc/Kconfig
View File

@ -96,11 +96,6 @@ config SPARC64
select PCI_DOMAINS if PCI
select ARCH_HAS_GIGANTIC_PAGE
config ARCH_DEFCONFIG
string
default "arch/sparc/configs/sparc32_defconfig" if SPARC32
default "arch/sparc/configs/sparc64_defconfig" if SPARC64
config ARCH_PROC_KCORE_TEXT
def_bool y

4
arch/sparc/include/asm/string.h
View File

@ -37,6 +37,10 @@ void *memmove(void *, const void *, __kernel_size_t);
#define __HAVE_ARCH_MEMCMP
int memcmp(const void *,const void *,__kernel_size_t);
/* Now the str*() stuff... */
#define __HAVE_ARCH_STRLEN
__kernel_size_t strlen(const char *);
#define __HAVE_ARCH_STRNCMP
int strncmp(const char *, const char *, __kernel_size_t);

4
arch/sparc/include/asm/string_64.h
View File

@ -12,8 +12,4 @@
#include <asm/asi.h>
/* Now the str*() stuff... */
#define __HAVE_ARCH_STRLEN
__kernel_size_t strlen(const char *);
#endif /* !(__SPARC64_STRING_H__) */

5
arch/x86/Kconfig
View File

@ -240,11 +240,6 @@ config OUTPUT_FORMAT
default "elf32-i386" if X86_32
default "elf64-x86-64" if X86_64
config ARCH_DEFCONFIG
string
default "arch/x86/configs/i386_defconfig" if X86_32
default "arch/x86/configs/x86_64_defconfig" if X86_64
config LOCKDEP_SUPPORT
def_bool y

5
arch/x86/um/Kconfig
View File

@ -27,11 +27,6 @@ config X86_64
def_bool 64BIT
select MODULES_USE_ELF_RELA
config ARCH_DEFCONFIG
string
default "arch/um/configs/i386_defconfig" if X86_32
default "arch/um/configs/x86_64_defconfig" if X86_64
config 3_LEVEL_PGTABLES
bool "Three-level pagetables" if !64BIT
default 64BIT

2
drivers/net/wan/Kconfig
View File

@ -200,7 +200,7 @@ config WANXL_BUILD_FIRMWARE
depends on WANXL && !PREVENT_FIRMWARE_BUILD
help
Allows you to rebuild firmware run by the QUICC processor.
It requires as68k, ld68k and hexdump programs.
It requires m68k toolchains and hexdump programs.
You should never need this option, say N.

33
drivers/net/wan/Makefile
View File

@ -40,21 +40,30 @@ $(obj)/wanxl.o: $(obj)/wanxlfw.inc
ifeq ($(CONFIG_WANXL_BUILD_FIRMWARE),y)
ifeq ($(ARCH),m68k)
AS68K = $(AS)
LD68K = $(LD)
M68KCC = $(CC)
M68KLD = $(LD)
else
AS68K = as68k
LD68K = ld68k
M68KCC = $(CROSS_COMPILE_M68K)gcc
M68KLD = $(CROSS_COMPILE_M68K)ld
endif
quiet_cmd_build_wanxlfw = BLDFW $@
cmd_build_wanxlfw = \
$(CPP) -D__ASSEMBLY__ -Wp,-MD,$(depfile) -I$(srctree)/include/uapi $< | $(AS68K) -m68360 -o $(obj)/wanxlfw.o; \
$(LD68K) --oformat binary -Ttext 0x1000 $(obj)/wanxlfw.o -o $(obj)/wanxlfw.bin; \
hexdump -ve '"\n" 16/1 "0x%02X,"' $(obj)/wanxlfw.bin | sed 's/0x ,//g;1s/^/static const u8 firmware[]={/;$$s/,$$/\n};\n/' >$(obj)/wanxlfw.inc; \
rm -f $(obj)/wanxlfw.bin $(obj)/wanxlfw.o
cmd_build_wanxlfw = hexdump -ve '"\n" 16/1 "0x%02X,"' $< | \
sed 's/0x ,//g;1s/^/static const u8 firmware[]={/;$$s/,$$/\n};\n/' > $@
$(obj)/wanxlfw.inc: $(src)/wanxlfw.S
$(call if_changed_dep,build_wanxlfw)
targets += wanxlfw.inc
$(obj)/wanxlfw.inc: $(obj)/wanxlfw.bin FORCE
$(call if_changed,build_wanxlfw)
quiet_cmd_m68kld_bin_o = M68KLD $@
cmd_m68kld_bin_o = $(M68KLD) --oformat binary -Ttext 0x1000 $< -o $@
$(obj)/wanxlfw.bin: $(obj)/wanxlfw.o FORCE
$(call if_changed,m68kld_bin_o)
quiet_cmd_m68kas_o_S = M68KAS $@
cmd_m68kas_o_S = $(M68KCC) -D__ASSEMBLY__ -Wp,-MD,$(depfile) -I$(srctree)/include/uapi -c -o $@ $<
$(obj)/wanxlfw.o: $(src)/wanxlfw.S FORCE
$(call if_changed_dep,m68kas_o_S)
endif
targets += wanxlfw.inc wanxlfw.bin wanxlfw.o

2
include/net/drop_monitor.h
View File

@ -19,7 +19,7 @@ struct net_dm_hw_metadata {
struct net_device *input_dev;
};
#if IS_ENABLED(CONFIG_NET_DROP_MONITOR)
#if IS_REACHABLE(CONFIG_NET_DROP_MONITOR)
void net_dm_hw_report(struct sk_buff *skb,
const struct net_dm_hw_metadata *hw_metadata);
#else

16
init/Kconfig
View File

@ -6,8 +6,7 @@ config DEFCONFIG_LIST
default "/lib/modules/$(shell,uname -r)/.config"
default "/etc/kernel-config"
default "/boot/config-$(shell,uname -r)"
default ARCH_DEFCONFIG
default "arch/$(ARCH)/defconfig"
default "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)"
config CC_IS_GCC
def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
@ -2211,6 +2210,19 @@ config TRIM_UNUSED_KSYMS
If unsure, or if you need to build out-of-tree modules, say N.
config UNUSED_KSYMS_WHITELIST
string "Whitelist of symbols to keep in ksymtab"
depends on TRIM_UNUSED_KSYMS
help
By default, all unused exported symbols will be un-exported from the
build when TRIM_UNUSED_KSYMS is selected.
UNUSED_KSYMS_WHITELIST allows to whitelist symbols that must be kept
exported at all times, even in absence of in-tree users. The value to
set here is the path to a text file containing the list of symbols,
one per line. The path can be absolute, or relative to the kernel
source tree.
endif # MODULES
config MODULES_TREE_LOOKUP

3
lib/Kconfig.debug
View File

@ -266,7 +266,7 @@ config ENABLE_MUST_CHECK
attribute warn_unused_result" messages.
config FRAME_WARN
int "Warn for stack frames larger than (needs gcc 4.4)"
int "Warn for stack frames larger than"
range 0 8192
default 2048 if GCC_PLUGIN_LATENT_ENTROPY
default 1280 if (!64BIT && PARISC)
@ -276,7 +276,6 @@ config FRAME_WARN
Tell gcc to warn at build time for stack frames larger than this.
Setting this too low will cause a lot of warnings.
Setting it to 0 disables the warning.
Requires gcc 4.4
config STRIP_ASM_SYMS
bool "Strip assembler-generated symbols during link"

26
scripts/Makefile.dtbinst
View File

@ -13,28 +13,24 @@ src := $(obj)
PHONY := __dtbs_install
__dtbs_install:
export dtbinst_root ?= $(obj)
include include/config/auto.conf
include scripts/Kbuild.include
include $(src)/Makefile
dtbinst-files := $(sort $(dtb-y) $(if $(CONFIG_OF_ALL_DTBS), $(dtb-)))
dtbinst-dirs := $(subdir-y) $(subdir-m)
dtbs := $(addprefix $(dst)/, $(dtb-y) $(if $(CONFIG_OF_ALL_DTBS),$(dtb-)))
subdirs := $(addprefix $(obj)/, $(subdir-y) $(subdir-m))
# Helper targets for Installing DTBs into the boot directory
quiet_cmd_dtb_install = INSTALL $<
cmd_dtb_install = mkdir -p $(2); cp $< $(2)
__dtbs_install: $(dtbs) $(subdirs)
@:
install-dir = $(patsubst $(dtbinst_root)%,$(INSTALL_DTBS_PATH)%,$(obj))
quiet_cmd_dtb_install = INSTALL $@
cmd_dtb_install = install -D $< $@
$(dtbinst-files): %.dtb: $(obj)/%.dtb
$(call cmd,dtb_install,$(install-dir))
$(dst)/%.dtb: $(obj)/%.dtb
$(call cmd,dtb_install)
$(dtbinst-dirs):
$(Q)$(MAKE) $(dtbinst)=$(obj)/$@
PHONY += $(dtbinst-files) $(dtbinst-dirs)
__dtbs_install: $(dtbinst-files) $(dtbinst-dirs)
PHONY += $(subdirs)
$(subdirs):
$(Q)$(MAKE) $(dtbinst)=$@ dst=$(patsubst $(obj)/%,$(dst)/%,$@)
.PHONY: $(PHONY)

3
scripts/Makefile.lib
View File

@ -297,7 +297,8 @@ $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
DT_CHECKER ?= dt-validate
DT_BINDING_DIR := Documentation/devicetree/bindings
DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
# DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile
DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
quiet_cmd_dtb_check = CHECK $@
cmd_dtb_check = $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@

1
scripts/Makefile.modpost
View File

@ -53,6 +53,7 @@ MODPOST = scripts/mod/modpost \
$(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS))) \
$(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \
$(if $(KBUILD_MODPOST_WARN),-w)
ifdef MODPOST_VMLINUX

24
scripts/adjust_autoksyms.sh
View File

@ -1,14 +1,13 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
# Script to create/update include/generated/autoksyms.h and dependency files
# Script to update include/generated/autoksyms.h and dependency files
#
# Copyright: (C) 2016 Linaro Limited
# Created by: Nicolas Pitre, January 2016
#
# Create/update the include/generated/autoksyms.h file from the list
# of all module's needed symbols as recorded on the second line of *.mod files.
# Update the include/generated/autoksyms.h file.
#
# For each symbol being added or removed, the corresponding dependency
# file's timestamp is updated to force a rebuild of the affected source
@ -38,23 +37,8 @@ esac
# We need access to CONFIG_ symbols
. include/config/auto.conf
# Generate a new ksym list file with symbols needed by the current
# set of modules.
cat > "$new_ksyms_file" << EOT
/*
* Automatically generated file; DO NOT EDIT.
*/
EOT
sed 's/ko$/mod/' modules.order |
xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- |
sort -u |
sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$new_ksyms_file"
# Special case for modversions (see modpost.c)
if [ -n "$CONFIG_MODVERSIONS" ]; then
echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
fi
# Generate a new symbol list file
$CONFIG_SHELL $srctree/scripts/gen_autoksyms.sh "$new_ksyms_file"
# Extract changes between old and new list and touch corresponding
# dependency files.

10
scripts/basic/fixdep.c
View File

@ -77,11 +77,6 @@
* dependencies on include/config/my/option.h for every
* CONFIG_MY_OPTION encountered in any of the prerequisites.
*
* It will also filter out all the dependencies on *.ver. We need
* to make sure that the generated version checksum are globally up
* to date before even starting the recursive build, so it's too late
* at this point anyway.
*
* We don't even try to really parse the header files, but
* merely grep, i.e. if CONFIG_FOO is mentioned in a comment, it will
* be picked up as well. It's not a problem with respect to
@ -251,7 +246,7 @@ static void parse_config_file(const char *p)
}
p += 7;
q = p;
while (*q && (isalnum(*q) || *q == '_'))
while (isalnum(*q) || *q == '_')
q++;
if (str_ends_with(p, q - p, "_MODULE"))
r = q - 7;
@ -299,8 +294,7 @@ static void *read_file(const char *filename)
static int is_ignored_file(const char *s, int len)
{
return str_ends_with(s, len, "include/generated/autoconf.h") ||
str_ends_with(s, len, "include/generated/autoksyms.h") ||
str_ends_with(s, len, ".ver");
str_ends_with(s, len, "include/generated/autoksyms.h");
}
/*

3
scripts/dtc/Makefile
View File

@ -2,7 +2,8 @@
# scripts/dtc makefile
hostprogs := dtc
always-$(CONFIG_DTC) := $(hostprogs)
always-$(CONFIG_DTC) += $(hostprogs)
always-$(CHECK_DT_BINDING) += $(hostprogs)
dtc-objs := dtc.o flattree.o fstree.o data.o livetree.o treesource.o \
srcpos.o checks.o util.o

2
scripts/gcc-plugins/Makefile
View File

@ -10,7 +10,7 @@ else
HOSTLIBS := hostcxxlibs
HOST_EXTRACXXFLAGS += -I$(GCC_PLUGINS_DIR)/include -I$(src) -std=gnu++98 -fno-rtti
HOST_EXTRACXXFLAGS += -fno-exceptions -fasynchronous-unwind-tables -ggdb
HOST_EXTRACXXFLAGS += -Wno-narrowing -Wno-unused-variable
HOST_EXTRACXXFLAGS += -Wno-narrowing -Wno-unused-variable -Wno-c++11-compat
export HOST_EXTRACXXFLAGS
endif

52
scripts/gen_autoksyms.sh Executable file
View File

@ -0,0 +1,52 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
# Create an autoksyms.h header file from the list of all module's needed symbols
# as recorded on the second line of *.mod files and the user-provided symbol
# whitelist.
set -e
output_file="$1"
# Use "make V=1" to debug this script.
case "$KBUILD_VERBOSE" in
*1*)
set -x
;;
esac
# We need access to CONFIG_ symbols
. include/config/auto.conf
ksym_wl=/dev/null
if [ -n "$CONFIG_UNUSED_KSYMS_WHITELIST" ]; then
# Use 'eval' to expand the whitelist path and check if it is relative
eval ksym_wl="$CONFIG_UNUSED_KSYMS_WHITELIST"
[ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl"
if [ ! -f "$ksym_wl" ] || [ ! -r "$ksym_wl" ]; then
echo "ERROR: '$ksym_wl' whitelist file not found" >&2
exit 1
fi
fi
# Generate a new ksym list file with symbols needed by the current
# set of modules.
cat > "$output_file" << EOT
/*
* Automatically generated file; DO NOT EDIT.
*/
EOT
[ -f modules.order ] && modlist=modules.order || modlist=/dev/null
sed 's/ko$/mod/' $modlist |
xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- |
cat - "$ksym_wl" |
sort -u |
sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file"
# Special case for modversions (see modpost.c)
if [ -n "$CONFIG_MODVERSIONS" ]; then
echo "#define __KSYM_module_layout 1" >> "$output_file"
fi

4
scripts/kconfig/Makefile
View File

@ -12,10 +12,6 @@ else
Kconfig := Kconfig
endif
ifndef KBUILD_DEFCONFIG
KBUILD_DEFCONFIG := defconfig
endif
ifeq ($(quiet),silent_)
silent := -s
endif

2
scripts/kconfig/qconf.cc
View File

@ -309,8 +309,6 @@ ConfigList::ConfigList(ConfigView* p, const char *name)
showName(false), showRange(false), showData(false), mode(singleMode), optMode(normalOpt),
rootEntry(0), headerPopup(0)
{
int i;
setObjectName(name);
setSortingEnabled(false);
setRootIsDecorated(true);

9
scripts/kconfig/symbol.c
View File

@ -221,7 +221,7 @@ static void sym_calc_visibility(struct symbol *sym)
sym_set_changed(sym);
}
tri = no;
if (sym->implied.expr && sym->dir_dep.tri != no)
if (sym->implied.expr)
tri = expr_calc_value(sym->implied.expr);
if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
tri = yes;
@ -394,6 +394,8 @@ void sym_calc_value(struct symbol *sym)
if (sym->implied.tri != no) {
sym->flags |= SYMBOL_WRITE;
newval.tri = EXPR_OR(newval.tri, sym->implied.tri);
newval.tri = EXPR_AND(newval.tri,
sym->dir_dep.tri);
}
}
calc_newval:
@ -401,8 +403,7 @@ void sym_calc_value(struct symbol *sym)
sym_warn_unmet_dep(sym);
newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
}
if (newval.tri == mod &&
(sym_get_type(sym) == S_BOOLEAN || sym->implied.tri == yes))
if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
newval.tri = yes;
break;
case S_STRING:
@ -484,8 +485,6 @@ bool sym_tristate_within_range(struct symbol *sym, tristate val)
return false;
if (sym->visible <= sym->rev_dep.tri)
return false;
if (sym->implied.tri == yes && val == mod)
return false;
if (sym_is_choice_value(sym) && sym->visible == yes)
return val == yes;
return val >= sym->rev_dep.tri && val <= sym->visible;

11
scripts/mkcompile_h
View File

@ -10,17 +10,6 @@ CC=$6
vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
# If compile.h exists already and we don't own autoconf.h
# (i.e. we're not the same user who did make *config), don't
# modify compile.h
# So "sudo make install" won't change the "compiled by <user>"
# do "compiled by root"
if [ -r $TARGET -a ! -O include/generated/autoconf.h ]; then
vecho " SKIPPED $TARGET"
exit 0
fi
# Do not expand names
set -f

77
scripts/mod/modpost.c
View File

@ -39,6 +39,8 @@ static int sec_mismatch_count = 0;
static int sec_mismatch_fatal = 0;
/* ignore missing files */
static int ignore_missing_files;
/* If set to 1, only warn (instead of error) about missing ns imports */
static int allow_missing_ns_imports;
enum export {
export_plain, export_unused, export_gpl,
@ -51,41 +53,33 @@ enum export {
#define MODULE_NAME_LEN (64 - sizeof(Elf_Addr))
#define PRINTF __attribute__ ((format (printf, 1, 2)))
PRINTF void fatal(const char *fmt, ...)
{
va_list arglist;
fprintf(stderr, "FATAL: ");
va_start(arglist, fmt);
vfprintf(stderr, fmt, arglist);
va_end(arglist);
exit(1);
}
PRINTF void warn(const char *fmt, ...)
void __attribute__((format(printf, 2, 3)))
modpost_log(enum loglevel loglevel, const char *fmt, ...)
{
va_list arglist;
switch (loglevel) {
case LOG_WARN:
fprintf(stderr, "WARNING: ");
va_start(arglist, fmt);
vfprintf(stderr, fmt, arglist);
va_end(arglist);
break;
case LOG_ERROR:
fprintf(stderr, "ERROR: ");
break;
case LOG_FATAL:
fprintf(stderr, "FATAL: ");
break;
default: /* invalid loglevel, ignore */
break;
}
PRINTF void merror(const char *fmt, ...)
{
va_list arglist;
fprintf(stderr, "ERROR: ");
fprintf(stderr, "modpost: ");
va_start(arglist, fmt);
vfprintf(stderr, fmt, arglist);
va_end(arglist);
if (loglevel == LOG_FATAL)
exit(1);
}
static inline bool strends(const char *str, const char *postfix)
@ -113,7 +107,7 @@ static int is_vmlinux(const char *modname)
void *do_nofail(void *ptr, const char *expr)
{
if (!ptr)
fatal("modpost: Memory allocation failure: %s.\n", expr);
fatal("Memory allocation failure: %s.\n", expr);
return ptr;
}
@ -2022,7 +2016,7 @@ static void read_symbols(const char *modname)
license = get_modinfo(&info, "license");
if (!license && !is_vmlinux(modname))
warn("modpost: missing MODULE_LICENSE() in %s\n"
warn("missing MODULE_LICENSE() in %s\n"
"see include/linux/module.h for "
"more information\n", modname);
while (license) {
@ -2153,15 +2147,15 @@ static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
switch (exp) {
case export_gpl:
fatal("modpost: GPL-incompatible module %s%s "
fatal("GPL-incompatible module %s%s "
"uses GPL-only symbol '%s'\n", m, e, s);
break;
case export_unused_gpl:
fatal("modpost: GPL-incompatible module %s%s "
fatal("GPL-incompatible module %s%s "
"uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
break;
case export_gpl_future:
warn("modpost: GPL-incompatible module %s%s "
warn("GPL-incompatible module %s%s "
"uses future GPL-only symbol '%s'\n", m, e, s);
break;
case export_plain:
@ -2179,7 +2173,7 @@ static void check_for_unused(enum export exp, const char *m, const char *s)
switch (exp) {
case export_unused:
case export_unused_gpl:
warn("modpost: module %s%s "
warn("module %s%s "
"uses symbol '%s' marked UNUSED\n", m, e, s);
break;
default:
@ -2198,15 +2192,12 @@ static int check_exports(struct module *mod)
exp = find_symbol(s->name);
if (!exp || exp->module == mod) {
if (have_vmlinux && !s->weak) {
if (warn_unresolved) {
warn("\"%s\" [%s.ko] undefined!\n",
s->name, mod->name);
} else {
merror("\"%s\" [%s.ko] undefined!\n",
modpost_log(warn_unresolved ? LOG_WARN : LOG_ERROR,
"\"%s\" [%s.ko] undefined!\n",
s->name, mod->name);
if (!warn_unresolved)
err = 1;
}
}
continue;
}
basename = strrchr(mod->name, '/');
@ -2217,8 +2208,11 @@ static int check_exports(struct module *mod)
if (exp->namespace &&
!module_imports_namespace(mod, exp->namespace)) {
warn("module %s uses symbol %s from namespace %s, but does not import it.\n",
modpost_log(allow_missing_ns_imports ? LOG_WARN : LOG_ERROR,
"module %s uses symbol %s from namespace %s, but does not import it.\n",
basename, exp->name, exp->namespace);
if (!allow_missing_ns_imports)
err = 1;
add_namespace(&mod->missing_namespaces, exp->namespace);
}
@ -2565,7 +2559,7 @@ int main(int argc, char **argv)
struct ext_sym_list *extsym_iter;
struct ext_sym_list *extsym_start = NULL;
while ((opt = getopt(argc, argv, "i:e:mnsT:o:awEd:")) != -1) {
while ((opt = getopt(argc, argv, "i:e:mnsT:o:awENd:")) != -1) {
switch (opt) {
case 'i':
kernel_read = optarg;
@ -2603,6 +2597,9 @@ int main(int argc, char **argv)
case 'E':
sec_mismatch_fatal = 1;
break;
case 'N':
allow_missing_ns_imports = 1;
break;
case 'd':
missing_namespace_deps = optarg;
break;
@ -2658,7 +2655,7 @@ int main(int argc, char **argv)
if (dump_write)
write_dump(dump_write);
if (sec_mismatch_count && sec_mismatch_fatal)
fatal("modpost: Section mismatches detected.\n"
fatal("Section mismatches detected.\n"
"Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.\n");
for (n = 0; n < SYMBOL_HASH_SIZE; n++) {
struct symbol *s;

14
scripts/mod/modpost.h
View File

@ -198,6 +198,14 @@ void *grab_file(const char *filename, unsigned long *size);
char* get_next_line(unsigned long *pos, void *file, unsigned long size);
void release_file(void *file, unsigned long size);
void fatal(const char *fmt, ...);
void warn(const char *fmt, ...);
void merror(const char *fmt, ...);
enum loglevel {
LOG_WARN,
LOG_ERROR,
LOG_FATAL
};
void modpost_log(enum loglevel loglevel, const char *fmt, ...);
#define warn(fmt, args...) modpost_log(LOG_WARN, fmt, ##args)
#define merror(fmt, args...) modpost_log(LOG_ERROR, fmt, ##args)
#define fatal(fmt, args...) modpost_log(LOG_FATAL, fmt, ##args)

5
scripts/package/mkdebian
View File

@ -198,6 +198,10 @@ Description: Linux support headers for userspace development
This package provides userspaces headers from the Linux kernel. These headers
are used by the installed headers for GNU glibc and other system libraries.
Multi-Arch: same
EOF
if is_enabled CONFIG_DEBUG_INFO; then
cat <<EOF >> debian/control
Package: $dbg_packagename
Section: debug
@ -206,6 +210,7 @@ Description: Linux kernel debugging symbols for $version
This package will come in handy if you need to debug the kernel. It provides
all the necessary debug symbols for the kernel and its modules.
EOF
fi
cat <<EOF > debian/rules
#!$(command -v $MAKE) -f