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Message-ID: <CAK7LNARgFip=ywrLdF8Z5uznQBmYTZfxn5PHR9jSnYEJDxYc_w@mail.gmail.com>
Date: Tue, 12 May 2020 13:34:36 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc: bpf <bpf@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
Sam Ravnborg <sam@...nborg.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 00/15] kbuild: support 'userprogs' syntax
On Wed, Apr 29, 2020 at 12:45 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
>
> Several Makefiles use 'hostprogs' to build programs for the host
> architecture where it is not appropriate to do so.
> This is just because Kbuild lacks the support for building programs
> for the target architecture.
>
> This series introduce 'userprogs' syntax and use it from
> sample and bpf Makefiles.
>
> Sam worked on this in 2014.
> https://lkml.org/lkml/2014/7/13/154
>
> He used 'uapiprogs-y' but I just thought the meaning of
> "UAPI programs" is unclear.
>
> Naming the syntax is one of the most difficult parts.
>
> I chose 'userprogs'. Anothor choice I had in my mind was 'targetprogs'.
>
> You can test this series quickly by 'make allmodconfig samples/'
>
> When building objects for userspace, [U] is displayed.
>
> masahiro@...ar:~/workspace/linux$ make allmodconfig samples/
All applied to linux-kbuild.
> [snip]
> 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
>
> Changes for v2:
> - Fix ARCH=i386 build error for bpfilter_umh
> - Rename 'user-ccflags' to 'userccflags'
> because 'user-ccflags' would conflict if an object
> called 'user.o' exists in the directory.
> - Support 'userldflags'
>
> Masahiro Yamada (14):
> bpfilter: match bit size of bpfilter_umh to that of the kernel
> kbuild: add infrastructure to build userspace programs
> 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 | 183 +++++++++++++++++++++--------
> Makefile | 13 +-
> init/Kconfig | 4 +-
> net/bpfilter/Makefile | 11 +-
> samples/Kconfig | 26 +++-
> samples/Makefile | 4 +
> 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/Makefile.build | 6 +
> scripts/Makefile.clean | 2 +-
> scripts/Makefile.userprogs | 45 +++++++
> usr/include/Makefile | 4 +
> 22 files changed, 267 insertions(+), 175 deletions(-)
> create mode 100644 samples/uhid/.gitignore
> create mode 100644 scripts/Makefile.userprogs
>
> --
> 2.25.1
>
--
Best Regards
Masahiro Yamada
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