linux-kernel - Re: [PATCH, net-next] perf, bpf: fix conditional call to bpf_overflow

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Date:   Tue, 6 Sep 2016 08:33:50 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alexei Starovoitov <ast@...com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH, net-next] perf, bpf: fix conditional call to
 bpf_overflow_handler

On Tue, Sep 06, 2016 at 03:10:22PM +0200, Arnd Bergmann wrote:
> The newly added bpf_overflow_handler function is only built of both
> CONFIG_EVENT_TRACING and CONFIG_BPF_SYSCALL are enabled, but the caller
> only checks the latter:
> 
> kernel/events/core.c: In function 'perf_event_alloc':
> kernel/events/core.c:9106:27: error: 'bpf_overflow_handler' undeclared (first use in this function)
> 
> This changes the caller so we also skip this call if CONFIG_EVENT_TRACING
> is disabled entirely.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: aa6a5f3cb2b2 ("perf, bpf: add perf events core support for BPF_PROG_TYPE_PERF_EVENT programs")
> ---
>  kernel/events/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> I'm not entirely sure if this is the correct solution, please check before applying

Acked-by: Alexei Starovoitov <ast@...nel.org>

Thanks for the fix. Just saw build bot complaining last night and
by the morning your fix is already here. Thanks!