netdev - Re: [PATCH bpf-next] bpf: check that BPF programs run with preemption disabled

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Message-ID: <799a8afa-fe19-21ad-e73e-b24199dd55c8@iogearbox.net>
Date:   Thu, 31 Jan 2019 23:29:59 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Alexei Starovoitov <ast@...nel.org>, davem@...emloft.net
Cc:     peterz@...radead.org, jannh@...gle.com, paulmck@...ux.ibm.com,
        will.deacon@....com, mingo@...hat.com, netdev@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH bpf-next] bpf: check that BPF programs run with preemption
 disabled

On 01/29/2019 02:21 AM, Alexei Starovoitov wrote:
> From: Peter Zijlstra <peterz@...radead.org>
> 
> Introduce cant_sleep() macro for annotation of functions that cannot sleep.
> 
> Use it in BPF_PROG_RUN to catch execution of BPF programs
> in preemptable context.
> 
> Suggested-by: Jann Horn <jannh@...gle.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>

(Just fyi, will let this sit in patchwork till the preemption fixes have been
merged back from bpf into bpf-next as otherwise people will yell that they
hit this frequently.)