Re: [PATCH] sample/bpf: Make perf_event_read() static
From: Arnaldo Carvalho de Melo
Date: Thu Dec 15 2016 - 10:54:44 EST
Em Thu, Dec 15, 2016 at 04:49:07PM +0100, Daniel Borkmann escreveu:
> On 12/15/2016 04:29 PM, Arnaldo Carvalho de Melo wrote:
> > While testing Joe's conversion of samples/bpf/ to use tools/lib/bpf/ I
> > noticed some warnings, do you guys mind if I put patches like the one
> > below in my tree, pushing to Ingo soon?
> > Or is there anything subtle against doing so?
> Fwiw, no objections from my side, there is currently nothing in
> net/net-next tree that could cause conflicts regarding the below
> change, so should be good to take this route instead.
Thanks a lot!
Ah, since it seems the overhead of having clang/llvm/bc/findutils in
addition to what I have in the containers for distros with suitable
packages is small, I'll probably end up building samples/bpf/ in those
containers, in addition to building perf with/without libelf and
This way I'll catch build problems everytime I prepare my pull reqs to
Ingo and hopefully fix them then.
> > ----
> > While building samples/bpf/ on a Fedora Rawhide container, with
> > clang/llvm 3.9 I noticed this:
> > root@1e797fdfbf4f linux]# make -j4 O=/tmp/build/linux/ samples/bpf/
> > make: Entering directory '/tmp/build/linux'
> > CHK include/config/kernel.release
> > GEN ./Makefile
> > CHK include/generated/uapi/linux/version.h
> > Using /git/linux as source for kernel
> > <SNIP>
> > HOSTCC samples/bpf/trace_output_user.o
> > /git/linux/samples/bpf/trace_output_user.c:64:6: warning: no previous
> > prototype for 'perf_event_read' [-Wmissing-prototypes]
> > void perf_event_read(print_fn fn)
> > ^~~~~~~~~~~~~~~
> > HOSTLD samples/bpf/trace_output
> > make: Leaving directory '/tmp/build/linux'
> > Shutup the compiler by setting that function as static.
> > Cc: Alexei Starovoitov <ast@xxxxxx>
> > Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
> > Cc: Wang Nan <wangnan0@xxxxxxxxxx>,
> > Cc: Joe Stringer <joe@xxxxxxx>
> > Link: http://lkml.kernel.org/n/tip-2wkr4ymwhdie0stbkbiyplt5@xxxxxxxxxxxxxx
> > Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> Acked-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>