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Subject: Re: [PATCH bpf-next] bpf: check that BPF programs run with preemption
 disabled
From:   Daniel Borkmann <daniel@iogearbox.net>
To:     Alexei Starovoitov <ast@kernel.org>, davem@davemloft.net
Cc:     peterz@infradead.org, jannh@google.com, paulmck@linux.ibm.com,
        will.deacon@arm.com, mingo@redhat.com, netdev@vger.kernel.org,
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Date:   Tue, 19 Feb 2019 21:58:48 +0100
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On 01/31/2019 11:29 PM, Daniel Borkmann wrote:
> On 01/29/2019 02:21 AM, Alexei Starovoitov wrote:
>> From: Peter Zijlstra <peterz@infradead.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@google.com>
>> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
>> Signed-off-by: Alexei Starovoitov <ast@kernel.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.)

Pushed out now, thanks!