Re: [PATCH bpf-next] bpf: Prevent bpf program recursion for raw tracepoint probes

[Jiri Olsa <olsajiri@gmail.com>]

On Fri, Sep 09, 2022 at 03:27:57PM +0800, kernel test robot wrote:
> Hi Jiri,
> 
> I love your patch! Yet something to improve:
> 
> [auto build test ERROR on bpf-next/master]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Jiri-Olsa/bpf-Prevent-bpf-program-recursion-for-raw-tracepoint-probes/20220908-194832
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
> config: x86_64-randconfig-c022 (https://download.01.org/0day-ci/archive/20220909/202209091544.TU8KWEUM-lkp@intel.com/config)
> compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
> reproduce (this is a W=1 build):
>         # https://github.com/intel-lab-lkp/linux/commit/f68b567cfb6572c20e431242a440cc5f01452485
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Jiri-Olsa/bpf-Prevent-bpf-program-recursion-for-raw-tracepoint-probes/20220908-194832
>         git checkout f68b567cfb6572c20e431242a440cc5f01452485
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>):
> 
>    ld: kernel/trace/bpf_trace.o: in function `__bpf_trace_run':
>    kernel/trace/bpf_trace.c:2046: undefined reference to `bpf_prog_inc_misses_counter'
> >> ld: kernel/trace/bpf_trace.c:2046: undefined reference to `bpf_prog_inc_misses_counter'
> >> ld: kernel/trace/bpf_trace.c:2046: undefined reference to `bpf_prog_inc_misses_counter'
> >> ld: kernel/trace/bpf_trace.c:2046: undefined reference to `bpf_prog_inc_misses_counter'
> >> ld: kernel/trace/bpf_trace.c:2046: undefined reference to `bpf_prog_inc_misses_counter'
>    ld: kernel/trace/bpf_trace.o:kernel/trace/bpf_trace.c:2046: more undefined references to `bpf_prog_inc_misses_counter' follow

ah right, trampoline.o is for JIT config only, will move
bpf_prog_inc_misses_counter to some common place

jirka

> 
> -- 
> 0-DAY CI Kernel Test Service
> https://01.org/lkp