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kbuild: add CONFIG_HEADERS_INSTALL and loosen the dependency of samples 

Commit 5318321d36 ("samples: disable CONFIG_SAMPLES for UML") used
a big hammer to fix the build errors under the samples/ directory.
Only some samples actually include uapi headers from usr/include.

Introduce CONFIG_HEADERS_INSTALL since 'depends on HEADERS_INSTALL' is
clearer than 'depends on !UML'. If this option is enabled, uapi headers
are installed before starting directory descending.

I added 'depends on HEADERS_INSTALL' to per-sample CONFIG options.
This allows UML to compile some samples.

$ make ARCH=um allmodconfig samples/
  [ snip ]
  CC [M]  samples/configfs/configfs_sample.o
  CC [M]  samples/kfifo/bytestream-example.o
  CC [M]  samples/kfifo/dma-example.o
  CC [M]  samples/kfifo/inttype-example.o
  CC [M]  samples/kfifo/record-example.o
  CC [M]  samples/kobject/kobject-example.o
  CC [M]  samples/kobject/kset-example.o
  CC [M]  samples/trace_events/trace-events-sample.o
  CC [M]  samples/trace_printk/trace-printk.o
  AR      samples/vfio-mdev/built-in.a
  AR      samples/built-in.a

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2019-06-04 19:13:59 +09:00
parent c6509a24d6
commit e949f4c2d6
12 changed files with 40 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Makefile
View File

@ -1053,9 +1053,6 @@ vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
targets := vmlinux
# Some samples need headers_install.
samples: headers_install
# The actual objects are generated when descending,
# make sure no implicit rule kicks in
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
@ -1199,6 +1196,10 @@ headers_check: headers_install
$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi dst=include HDRCHECK=1
ifdef CONFIG_HEADERS_INSTALL
prepare: headers_install
endif
ifdef CONFIG_HEADERS_CHECK
all: headers_check
endif
@ -1744,7 +1745,6 @@ build-dir = $(patsubst %/,%,$(dir $(build-target)))
PHONY += /
/: ./
samples/: headers_install
%/: prepare FORCE
$(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir)

1
arch/arc/configs/tb10x_defconfig
View File

@ -94,6 +94,7 @@ CONFIG_CONFIGFS_FS=y
CONFIG_DEBUG_INFO=y
CONFIG_STRIP_ASM_SYMS=y
CONFIG_DEBUG_FS=y
CONFIG_HEADERS_INSTALL=y
CONFIG_HEADERS_CHECK=y
CONFIG_DEBUG_SECTION_MISMATCH=y
CONFIG_MAGIC_SYSRQ=y

1
arch/nds32/configs/defconfig
View File

@ -92,6 +92,7 @@ CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_INFO_DWARF4=y
CONFIG_GDB_SCRIPTS=y
CONFIG_READABLE_ASM=y
CONFIG_HEADERS_INSTALL=y
CONFIG_HEADERS_CHECK=y
CONFIG_DEBUG_SECTION_MISMATCH=y
CONFIG_MAGIC_SYSRQ=y

1
arch/parisc/configs/a500_defconfig
View File

@ -166,6 +166,7 @@ CONFIG_NLS_ISO8859_1=m
CONFIG_NLS_ISO8859_15=m
CONFIG_NLS_UTF8=m
CONFIG_DEBUG_FS=y
CONFIG_HEADERS_INSTALL=y
CONFIG_HEADERS_CHECK=y
CONFIG_MAGIC_SYSRQ=y
# CONFIG_DEBUG_BUGVERBOSE is not set

1
arch/parisc/configs/b180_defconfig
View File

@ -90,6 +90,7 @@ CONFIG_NLS_ASCII=m
CONFIG_NLS_ISO8859_1=m
CONFIG_NLS_ISO8859_15=m
CONFIG_NLS_UTF8=m
CONFIG_HEADERS_INSTALL=y
CONFIG_HEADERS_CHECK=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_DEBUG_KERNEL=y

1
arch/parisc/configs/c3000_defconfig
View File

@ -139,6 +139,7 @@ CONFIG_NLS_ISO8859_1=m
CONFIG_NLS_ISO8859_15=m
CONFIG_NLS_UTF8=m
CONFIG_DEBUG_FS=y
CONFIG_HEADERS_INSTALL=y
CONFIG_HEADERS_CHECK=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_DEBUG_MUTEXES=y

1
arch/parisc/configs/default_defconfig
View File

@ -183,6 +183,7 @@ CONFIG_NLS_KOI8_R=m
CONFIG_NLS_KOI8_U=m
CONFIG_NLS_UTF8=y
CONFIG_DEBUG_FS=y
CONFIG_HEADERS_INSTALL=y
CONFIG_HEADERS_CHECK=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_DEBUG_KERNEL=y

1
arch/powerpc/configs/ppc6xx_defconfig
View File

@ -1124,6 +1124,7 @@ CONFIG_NLS_KOI8_R=m
CONFIG_NLS_KOI8_U=m
CONFIG_DEBUG_INFO=y
CONFIG_UNUSED_SYMBOLS=y
CONFIG_HEADERS_INSTALL=y
CONFIG_HEADERS_CHECK=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_DEBUG_KERNEL=y

1
arch/s390/configs/debug_defconfig
View File

@ -586,6 +586,7 @@ CONFIG_GDB_SCRIPTS=y
CONFIG_FRAME_WARN=1024
CONFIG_READABLE_ASM=y
CONFIG_UNUSED_SYMBOLS=y
CONFIG_HEADERS_INSTALL=y
CONFIG_HEADERS_CHECK=y
CONFIG_DEBUG_SECTION_MISMATCH=y
CONFIG_MAGIC_SYSRQ=y

21
lib/Kconfig.debug
View File

@ -305,14 +305,23 @@ config DEBUG_FS
If unsure, say N.
config HEADERS_CHECK
bool "Run sanity checks on uapi headers when building 'all'"
config HEADERS_INSTALL
bool "Install uapi headers to usr/include"
depends on !UML
help
This option will extract the user-visible kernel headers when
building the 'all' target, and will run basic sanity checks on them to
ensure that exported files do not attempt to include files which
were not exported, etc.
This option will install uapi headers (headers exported to user-space)
into the usr/include directory for use during the kernel build.
This is unneeded for building the kernel itself, but needed for some
user-space program samples. It is also needed by some features such
as uapi header sanity checks.
config HEADERS_CHECK
bool "Run sanity checks on uapi headers when building 'all'"
depends on HEADERS_INSTALL
help
This option will run basic sanity checks on uapi headers when
building the 'all' target, for example, ensure that they do not
attempt to include files which were not exported, etc.
If you're making modifications to header files which are
relevant for userspace, say 'Y', and check the headers

14
samples/Kconfig
View File

@ -1,7 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
menuconfig SAMPLES
bool "Sample kernel code"
depends on !UML
help
You can build and test sample kernel code here.
@ -95,16 +94,24 @@ config SAMPLE_CONFIGFS
config SAMPLE_CONNECTOR
tristate "Build connector sample -- loadable modules only"
depends on CONNECTOR && m
depends on CONNECTOR && HEADERS_INSTALL && m
help
When enabled, this builds both a sample kernel module for
the connector interface and a user space tool to communicate
with it.
See also Documentation/connector/connector.txt
config SAMPLE_HIDRAW
bool "hidraw sample"
depends on HEADERS_INSTALL
config SAMPLE_PIDFD
bool "pidfd sample"
depends on HEADERS_INSTALL
config SAMPLE_SECCOMP
bool "Build seccomp sample code"
depends on SECCOMP_FILTER
depends on SECCOMP_FILTER && HEADERS_INSTALL
help
Build samples of seccomp filters using various methods of
BPF filter construction.
@ -156,6 +163,7 @@ config SAMPLE_ANDROID_BINDERFS
config SAMPLE_VFS
bool "Build example programs that use new VFS system calls"
depends on HEADERS_INSTALL
help
Build example userspace programs that use new VFS system calls such
as mount API and statx(). Note that this is restricted to the x86

4
samples/Makefile
View File

@ -4,14 +4,14 @@
obj-$(CONFIG_SAMPLE_ANDROID_BINDERFS) += binderfs/
obj-$(CONFIG_SAMPLE_CONFIGFS) += configfs/
obj-$(CONFIG_SAMPLE_CONNECTOR) += connector/
subdir-y += hidraw
subdir-$(CONFIG_SAMPLE_HIDRAW) += hidraw
obj-$(CONFIG_SAMPLE_HW_BREAKPOINT) += hw_breakpoint/
obj-$(CONFIG_SAMPLE_KDB) += kdb/
obj-$(CONFIG_SAMPLE_KFIFO) += kfifo/
obj-$(CONFIG_SAMPLE_KOBJECT) += kobject/
obj-$(CONFIG_SAMPLE_KPROBES) += kprobes/
obj-$(CONFIG_SAMPLE_LIVEPATCH) += livepatch/
subdir-y += pidfd
subdir-$(CONFIG_SAMPLE_PIDFD) += pidfd
obj-$(CONFIG_SAMPLE_QMI_CLIENT) += qmi/
obj-$(CONFIG_SAMPLE_RPMSG_CLIENT) += rpmsg/
subdir-$(CONFIG_SAMPLE_SECCOMP) += seccomp