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Date: Thu, 31 Mar 2022 16:29:30 +0900 From: Masahiro Yamada <masahiroy@...nel.org> To: Steven Rostedt <rostedt@...dmis.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Beau Belgrave <beaub@...ux.microsoft.com>, Masami Hiramatsu <mhiramat@...nel.org>, linux-trace-devel <linux-trace-devel@...r.kernel.org>, bpf <bpf@...r.kernel.org>, Network Development <netdev@...r.kernel.org>, Alexei Starovoitov <alexei.starovoitov@...il.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Michal Marek <michal.lkml@...kovi.net>, Nick Desaulniers <ndesaulniers@...gle.com>, Linux Kbuild mailing list <linux-kbuild@...r.kernel.org> Subject: Re: [PATCH] tracing: do not export user_events uapi On Thu, Mar 31, 2022 at 5:21 AM Steven Rostedt <rostedt@...dmis.org> wrote: > > > Adding the build maintainers. > > -- Steve > > On Wed, 30 Mar 2022 16:17:55 -0400 > Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote: > > > In addition to mark the USER_EVENTS feature BROKEN until all interested > > parties figure out the user-space API, do not install the uapi header. > > > > This prevents situations where a non-final uapi header would end up > > being installed into a distribution image and used to build user-space > > programs that would then run against newer kernels that will implement > > user events with a different ABI. > > > > Link: https://lore.kernel.org/all/20220330155835.5e1f6669@gandalf.local.home > > > > Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com> > > --- > > include/uapi/Kbuild | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/include/uapi/Kbuild b/include/uapi/Kbuild > > index 61ee6e59c930..425ea8769ddc 100644 > > --- a/include/uapi/Kbuild > > +++ b/include/uapi/Kbuild > > @@ -12,3 +12,6 @@ ifeq ($(wildcard $(objtree)/arch/$(SRCARCH)/include/generated/uapi/asm/kvm_para. > > no-export-headers += linux/kvm_para.h > > endif > > endif > > + > > +# API is not finalized > > +no-export-headers += linux/user_events.h > Well, the intended usage of no-export-headers is to cater to the UAPI supported by only some architectures. We have kvm(_para).h here because not all architectures support kvm. If you do not want to export the UAPI, you should not put it in include/uapi/. After the API is finalized, you can move it to include/uapi. -- Best Regards Masahiro Yamada
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