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Subject[PATCH 00/16] kbuild: support 'userprogs' syntax

Several Makefiles use 'hostprogs' for building the code for
the host architecture is not appropriate.

This is just because Kbuild does not provide the syntax to do it.

This series introduce 'userprogs' syntax and use it from
sample and bpf Makefiles.

Sam worked on this in 2014.

He used 'uapiprogs-y' but I just thought the meaning of
"UAPI programs" is unclear.

Naming is one the most difficult parts of this.

I chose 'userprogs'.
Anothor choice I had in my mind was 'targetprogs'.

If you can test this series quickly by
'make allmodconfig samples/'

When building objects for userspace, [U] is displayed.

masahiro@oscar:~/workspace/linux$ make allmodconfig samples/
AR samples/vfio-mdev/built-in.a
CC [M] samples/vfio-mdev/mtty.o
CC [M] samples/vfio-mdev/mdpy.o
CC [M] samples/vfio-mdev/mdpy-fb.o
CC [M] samples/vfio-mdev/mbochs.o
AR samples/mei/built-in.a
CC [U] samples/mei/mei-amt-version
CC [U] samples/auxdisplay/cfag12864b-example
CC [M] samples/configfs/configfs_sample.o
CC [M] samples/connector/cn_test.o
CC [U] samples/connector/ucon
CC [M] samples/ftrace/ftrace-direct.o
CC [M] samples/ftrace/ftrace-direct-too.o
CC [M] samples/ftrace/ftrace-direct-modify.o
CC [M] samples/ftrace/sample-trace-array.o
CC [U] samples/hidraw/hid-example
CC [M] samples/hw_breakpoint/data_breakpoint.o
CC [M] samples/kdb/kdb_hello.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/kprobes/kprobe_example.o
CC [M] samples/kprobes/kretprobe_example.o
CC [M] samples/livepatch/livepatch-sample.o
CC [M] samples/livepatch/livepatch-shadow-mod.o
CC [M] samples/livepatch/livepatch-shadow-fix1.o
CC [M] samples/livepatch/livepatch-shadow-fix2.o
CC [M] samples/livepatch/livepatch-callbacks-demo.o
CC [M] samples/livepatch/livepatch-callbacks-mod.o
CC [M] samples/livepatch/livepatch-callbacks-busymod.o
CC [M] samples/rpmsg/rpmsg_client_sample.o
CC [U] samples/seccomp/bpf-fancy.o
CC [U] samples/seccomp/bpf-helper.o
LD [U] samples/seccomp/bpf-fancy
CC [U] samples/seccomp/dropper
CC [U] samples/seccomp/bpf-direct
CC [U] samples/seccomp/user-trap
CC [U] samples/timers/hpet_example
CC [M] samples/trace_events/trace-events-sample.o
CC [M] samples/trace_printk/trace-printk.o
CC [U] samples/uhid/uhid-example
CC [M] samples/v4l/v4l2-pci-skeleton.o
CC [U] samples/vfs/test-fsmount
CC [U] samples/vfs/test-statx
samples/vfs/test-statx.c:24:15: warning: ‘struct foo’ declared inside parameter list will not be visible outside of this definition or declaration
24 | #define statx foo
| ^~~
CC [U] samples/watchdog/watchdog-simple
AR samples/built-in.a

Masahiro Yamada (15):
Documentation: kbuild: fix the section title format
Revert "objtool: Skip samples subdirectory"
kbuild: add infrastructure to build userspace programs
net: bpfilter: use 'userprogs' syntax to build bpfilter_umh
samples: seccomp: build sample programs for target architecture
kbuild: doc: document the new syntax 'userprogs'
samples: uhid: build sample program for target architecture
samples: hidraw: build sample program for target architecture
samples: connector: build sample program for target architecture
samples: vfs: build sample programs for target architecture
samples: pidfd: build sample program for target architecture
samples: mei: build sample program for target architecture
samples: auxdisplay: use 'userprogs' syntax
samples: timers: use 'userprogs' syntax
samples: watchdog: use 'userprogs' syntax

Sam Ravnborg (1):
samples: uhid: fix warnings in uhid-example

Documentation/kbuild/makefiles.rst | 185 +++++++++++++++++++++--------
Makefile | 11 +-
net/bpfilter/Makefile | 11 +-
samples/Kconfig | 26 +++-
samples/Makefile | 5 +-
samples/auxdisplay/Makefile | 11 +-
samples/connector/Makefile | 12 +-
samples/hidraw/Makefile | 9 +-
samples/mei/Makefile | 9 +-
samples/pidfd/Makefile | 8 +-
samples/seccomp/Makefile | 42 +------
samples/timers/Makefile | 17 +--
samples/uhid/.gitignore | 2 +
samples/uhid/Makefile | 9 +-
samples/uhid/uhid-example.c | 4 +-
samples/vfs/Makefile | 11 +-
samples/watchdog/Makefile | 10 +-
scripts/ | 5 +
scripts/Makefile.clean | 2 +-
scripts/Makefile.userprogs | 44 +++++++
20 files changed, 258 insertions(+), 175 deletions(-)
create mode 100644 samples/uhid/.gitignore
create mode 100644 scripts/Makefile.userprogs


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