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authorMasahiro Yamada <yamada.masahiro@socionext.com>2019-06-04 10:13:59 (GMT)
committerMasahiro Yamada <yamada.masahiro@socionext.com>2019-06-15 10:57:01 (GMT)
commite949f4c2d6a3df2b7fd00e56c0f081b15284906f (patch)
treec5b592d884e6eef3680177e384dfd567cc6e03e5
parentc6509a24d6ba0f8560a81c032c30d169ba467b0a (diff)
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kbuild: add CONFIG_HEADERS_INSTALL and loosen the dependency of samples
Commit 5318321d367c ("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>
-rw-r--r--Makefile8
-rw-r--r--arch/arc/configs/tb10x_defconfig1
-rw-r--r--arch/nds32/configs/defconfig1
-rw-r--r--arch/parisc/configs/a500_defconfig1
-rw-r--r--arch/parisc/configs/b180_defconfig1
-rw-r--r--arch/parisc/configs/c3000_defconfig1
-rw-r--r--arch/parisc/configs/default_defconfig1
-rw-r--r--arch/powerpc/configs/ppc6xx_defconfig1
-rw-r--r--arch/s390/configs/debug_defconfig1
-rw-r--r--lib/Kconfig.debug19
-rw-r--r--samples/Kconfig14
-rw-r--r--samples/Makefile4
12 files changed, 39 insertions, 14 deletions
diff --git a/Makefile b/Makefile
index 4bc9c70..f3fd2a5 100644
--- a/Makefile
+++ b/Makefile
@@ -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)
diff --git a/arch/arc/configs/tb10x_defconfig b/arch/arc/configs/tb10x_defconfig
index 5b5119d..dc739bd 100644
--- a/arch/arc/configs/tb10x_defconfig
+++ b/arch/arc/configs/tb10x_defconfig
@@ -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
diff --git a/arch/nds32/configs/defconfig b/arch/nds32/configs/defconfig
index 65ce925..40313a6 100644
--- a/arch/nds32/configs/defconfig
+++ b/arch/nds32/configs/defconfig
@@ -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
diff --git a/arch/parisc/configs/a500_defconfig b/arch/parisc/configs/a500_defconfig
index a885949..3335734 100644
--- a/arch/parisc/configs/a500_defconfig
+++ b/arch/parisc/configs/a500_defconfig
@@ -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
diff --git a/arch/parisc/configs/b180_defconfig b/arch/parisc/configs/b180_defconfig
index 0cae966..07fde5b 100644
--- a/arch/parisc/configs/b180_defconfig
+++ b/arch/parisc/configs/b180_defconfig
@@ -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
diff --git a/arch/parisc/configs/c3000_defconfig b/arch/parisc/configs/c3000_defconfig
index 6c29b84..64d45a8 100644
--- a/arch/parisc/configs/c3000_defconfig
+++ b/arch/parisc/configs/c3000_defconfig
@@ -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
diff --git a/arch/parisc/configs/default_defconfig b/arch/parisc/configs/default_defconfig
index 6a91cc2..5b877ca 100644
--- a/arch/parisc/configs/default_defconfig
+++ b/arch/parisc/configs/default_defconfig
@@ -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
diff --git a/arch/powerpc/configs/ppc6xx_defconfig b/arch/powerpc/configs/ppc6xx_defconfig
index 7c6baf6..463aa3e 100644
--- a/arch/powerpc/configs/ppc6xx_defconfig
+++ b/arch/powerpc/configs/ppc6xx_defconfig
@@ -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
diff --git a/arch/s390/configs/debug_defconfig b/arch/s390/configs/debug_defconfig
index b0920b3..994e03f 100644
--- a/arch/s390/configs/debug_defconfig
+++ b/arch/s390/configs/debug_defconfig
@@ -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
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 7cdcb96..6a6ea42 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -305,14 +305,23 @@ config DEBUG_FS
If unsure, say N.
+config HEADERS_INSTALL
+ bool "Install uapi headers to usr/include"
+ depends on !UML
+ help
+ 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 !UML
+ depends on HEADERS_INSTALL
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 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
diff --git a/samples/Kconfig b/samples/Kconfig
index d63cc8a..71b5e83 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -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
diff --git a/samples/Makefile b/samples/Makefile
index debf892..7d6e4ca 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -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