linux-kernel - Re: [PATCH bpf] bpf: trace: send signals asynchronously if !preemptible

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Message-Id: 
 <173697783222.891083.11459948002866992362.git-patchwork-notify@kernel.org>
Date: Wed, 15 Jan 2025 21:50:32 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Puranjay Mohan <puranjay@...nel.org>
Cc: song@...nel.org, jolsa@...nel.org, kpsingh@...nel.org,
 mattbobrowski@...gle.com, ast@...nel.org, daniel@...earbox.net,
 andrii@...nel.org, martin.lau@...ux.dev, eddyz87@...il.com,
 yonghong.song@...ux.dev, john.fastabend@...il.com, sdf@...ichev.me,
 haoluo@...gle.com, rostedt@...dmis.org, mhiramat@...nel.org,
 mathieu.desnoyers@...icios.com, bpf@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 puranjay12@...il.com
Subject: Re: [PATCH bpf] bpf: trace: send signals asynchronously if !preemptible

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@...nel.org>:

On Wed, 15 Jan 2025 10:36:47 +0000 you wrote:
> BPF programs can execute in all kinds of contexts and when a program
> running in a non-preemptible context uses the bpf_send_signal() kfunc,
> it will cause issues because this kfunc can sleep.
> 
> So change `irqs_disabled()` to `!preemptible()` that covers all edge
> cases: preempt_count() == 0 and irqs_disabled()
> 
> [...]

Here is the summary with links:
  - [bpf] bpf: trace: send signals asynchronously if !preemptible
    https://git.kernel.org/bpf/bpf-next/c/87c544108b61

You are awesome, thank you!
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