linux-kernel - Re: [PATCH v2 bpf-next 2/3] bpf: introduce helper bpf_get_branch

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Message-ID: <20210830104740.GK4353@worktop.programming.kicks-ass.net>
Date:   Mon, 30 Aug 2021 12:47:40 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Song Liu <songliubraving@...com>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, kbuild-all@...ts.01.org,
        acme@...nel.org, mingo@...hat.com, kjain@...ux.ibm.com,
        kernel-team@...com
Subject: Re: [PATCH v2 bpf-next 2/3] bpf: introduce helper
 bpf_get_branch_snapshot

On Fri, Aug 27, 2021 at 11:10:39PM +0800, kernel test robot wrote:

> All errors (new ones prefixed by >>):
> 
>    riscv32-linux-ld: kernel/bpf/trampoline.o: in function `.L57':
> >> trampoline.c:(.text+0x34c): undefined reference to `__SCK__perf_snapshot_branch_stack'
>    riscv32-linux-ld: kernel/bpf/trampoline.o: in function `.L61':
>    trampoline.c:(.text+0x360): undefined reference to `bpf_perf_branch_snapshot'
> 

This a build with PERF_EVENTS=n, I suppose you'd better make calling
perf_snapshot_branch_stack() dependent on having that :-)